TECHNICAL SPECIFICATIONS

TEXAS GULF COAST REGIONAL AIRPORT

ANGLETON, TEXAS

TERMINAL BUILDING STANDBY GENERATOR PROJECT

KSA Project No. 104132

ISSUED FOR BID

OCTOBER 2025

Prepared by:

2107 CityWest Boulevard, Third Floor Houston, Texas 77042

281.494.3252 www.ksaeng.com

TBPE Firm Registration No. F-1356 http://www.ksaeng.com/

Intentionally Left Blank

TABLE OF CONTENTS

Technical Specifications

Texas Gulf Coast Regional Airport Table of Contents Terminal Building Standby Generator Project IFB: October 3, 2025

Civil Specifications

1. Item KSA-101 Shop Drawings, Project Data and Samples .................................................... KSA-101-1

2. Item Tx247 Flexible Base ...................................................................................................... Tx247-1

3. Item Tx421 Hydraulic Cement Concrete ............................................................................... Tx421-1

4. Item Tx440 Reinforcement for Concrete .............................................................................. Tx440-1

Electrical Specifications

5. Item 260500 Common Work Results for Electrical ............................................................... 260500-1

6. Item 260530 Maintenance Testing of Electrical Systems ...................................................... 260530-1

7. Item 260553 Electrical Identification .................................................................................... 260553-1

8. Item 260580 Supporting Devices .......................................................................................... 260580-1

9. Item 260583 Wire Connections ............................................................................................ 260583-1

10. Item 260600 Grounding and Bonding Systems..................................................................... 260600-1

11. Item 260910 Work in Existing Building ................................................................................. 260910-1

12. Item 261110 Conduit ............................................................................................................ 261110-1

13. Item 261140 Wireways ......................................................................................................... 261140-1

14. Item 261200 Wire and Cable ................................................................................................ 261200-1

15. Item 261300 Boxes ............................................................................................................... 261300-1

16. Item 261400 Wiring Devices ................................................................................................. 261400-1

17. Item 261500 Wire Connections and Devices ........................................................................ 261500-1

18. Item 262310 Package Engine Generator............................................................................... 262310-1

19. Item 263630 Disconnect Switches ........................................................................................ 263630-1

20. Item 264130 Automatic Transfer Switches ........................................................................... 264130-1

TABLE OF CONTENTS

Technical Specifications

Texas Gulf Coast Regional Airport Table of Contents Terminal Building Standby Generator Project IFB: October 3, 2025

PAGE INTENTIONALLY LEFT BLANK

Texas Gulf Coast Regional Airport Shop Drawings, Project Data, and Samples Terminal Building Standby Generator Project IFB: October 3, 2025

KSA-101: Page 1 of 4

ITEM KSA-101 SHOP DRAWINGS, PROJECT DATA, AND SAMPLES

DESCRIPTION

101-1.1 Contractor shall furnish all labor, materials, tools, equipment, and perform all work and services necessary for or incidental to the furnishing, processing, delivery, reproduction and other necessary functions incidental to scheduling and handling of shop drawings, project data, and samples as indicated on the plans and/or as specified, in accordance with provisions of the Contract Documents, and completely coordinated with work of all trades.

a. Although such work is not specifically shown or specified, all supplementary or miscellaneous items, appurtenances, and devices incidental to or necessary for completion of work under this item shall be furnished and performed as part of this item.

b. See appropriate sections for specific items for which data and/or samples are required.

c. All material submittals shall include certification that the proposed material meets the Buy

American and/or Buy America provision(s) included in the contract documents. Failure to provide this certification will cause the submittal to be returned for re-submittal.

101-2.1 SUBMITTAL, ADDRESS. All items shall be submitted electronically. The preferred method of submission is utilizing the Newforma Info Exchange project page provided by KSA. KSA will provide a link to the project page for the Contractor to make submittals, to submit RFI’s, and upload large files as necessary. There is no cost for using this service. If for some reason the Contractor cannot utilize the Newforma Info Exchange project page for submission, the Contractor shall submit one scanned copy of the submittal via the email to the Project Manager, Project Engineer and Project Assistant, Craig Clairmont, at cclairmont@ksaeng.com, Nathan Mikell, at nmikell@ksaeng.com and fsalazar@ksaeng.com.

101-3.1 SUBMITTALS, GENERAL.

a. Contractor shall be responsible for and make all submissions. All items shall be transmitted electronically and include a Contractor’s review stamp.

b. Each transmittal will be sequentially numbered starting with No. 01.

(1) An item that is resubmitted will retain the original number but with an added suffix starting with A.

(2) Only one specification division should be covered by one letter of transmission.

(3) Sufficient catalog information together with catalog cuts and technical data must be submitted to allow an evaluation to be made to determine whether or not the item in question is acceptable.

c. No submittals will be returned to subcontractors. Submittals transmitted to the Engineer by anyone other than the Prime Contractor will be returned to the Prime Contractor.

mailto:cclairmont@ksaeng.com mailto:nmikell@ksaeng.com mailto:fsalazar@ksaeng.com

Terminal Building Standby Generator Project IFB: October 3, 2025

KSA-101: Page 2 of 4

d. Submit items sufficiently in advance of date required to allow reasonable time for review, and to allow for resubmission if necessary. Items submitted without Contractor's approval stamp will be returned, without action, for resubmission. Items that are not submitted in accord with the provisions of this item will be returned, without action, for resubmission.

e. Operation and Maintenance Manual, and/or warranties where required, shall be separate transmittal.

101-4.1 SUBMITTALS, SHOP DRAWINGS PROCEDURE.

a. Submit as indicated above. Identify submittals as to manufacturer, item, use, type, project designation, specification section or drawing detail reference, and other pertinent information.

b. Submit an electronic copy of each submittal until approval is obtained.

c. Allow clear space for stamping on right hand side. Contractor shall stamp his approval on drawings prior to submission to Engineer as indication of his checking and verification of dimensions and coordination with interrelated items. Marks on submittals by Contractor shall not be in red.

d. Submit standard items like equipment brochures, cuts of fixtures, or standard catalog items

(reproducible not required). Indicate exact item or model and all proposed options. Include scale details, sizes, dimensions, performance characteristics, capacities, wiring diagrams, controls, and other pertinent data.

101-5.1 SUBMITTALS, SAMPLES.

a. Submit to address indicated above. Identify submittals as to manufacturer, item, use, type, project designation, specification section of drawing detail reference, and other pertinent information.

b. Forward with transmittal letters. Include brochures, shop drawings, and installation instruction.

Contractor shall stamp his approval on drawings prior to submission to Engineer as indication of his checking and verification of dimensions and coordination with interrelated items.

Resubmit samples of rejected items.

c. Approved samples submitted or constructed, constitute criterion for judging completed work.

Finished work or items not equal to samples will be rejected.

d. Samples will be retained for comparison purposes and/or the Contractor shall remove samples as directed. Contractor shall pay all costs of furnishing and removing samples.

101-6.1 SUBMITTALS, APPROVAL OR REJECTION.

a. Transmittals returned with Approval are considered ready for fabrication and/or installation. If for any reason a transmittal that has an A or B approval is resubmitted, it must be accompanied by a letter pointing out the changes that have been made and the reason for the re-submittal.

Terminal Building Standby Generator Project IFB: October 3, 2025

KSA-101: Page 3 of 4

It shall be the Contractor's responsibility to assure that the previously approved documents are destroyed when they are superseded by a re-submittal as such.

b. Transmittals with approval combined with Action "Revise and Resubmit" or "Rejected" will be individually analyzed giving consideration as follows:

(1) If the items or system proposed is acceptable and the majority of the major individual components (Drawings or Documents) are in compliance; however, there are some minor items not in compliance. The portion of the transmittal given "Revise and Resubmit" or "Rejected" will not be distributed (unless previously agreed to otherwise).

Copies of the "Revise and Resubmit" or "Rejected" drawings will be marked up and returned to the Contractor electronically. It shall be the Contractor's responsibility to insure that these items are corrected and resubmitted.

(2) If the items or system proposed are acceptable; however, the major part of the individual drawings or documents are incomplete or require revision, the entire submittal will be given "Revise and Resubmit" or "Rejected" action. Again, it is reiterated that this is at the sole discretion of the Engineer and some drawings may contain relatively few or no comments for the statement, "Resubmit" to maintain a complete package. Distribution to the Owner and field will not be made unless previously agreed to otherwise.

(3) Approval is general and does not permit departure from Contract Documents; relieve

Contractor from responsibility for errors in detail, dimensions or related items; approve departure from previous instructions or details; components, wiring, etc., required to make item operational or usable.

(4) Manufacture or fabrication of items prior to final approval is at Contractor's own risk.

101-7.1 REQUIRED SHOP DRAWINGS, CERTIFICATE, OR REPORTS. Shop drawings, certificate, or reports shall be submitted on the following items, as appropriate, for approval. The following list is not considered all-inclusive. The Contractor shall supply all submittals required by the plans and specifications. Items that do not have specific pay items, but are required to be furnished by the contract documents shall not be paid for directly but shall be considered subsidiary to the project.

a. Concrete Mix Design (For Each Class of Concrete Required)

b. Reinforcing Steel

c. Seed, Fertilizer and Hydromulch

d. Joint Sealing Materials (Backer Rod, Sealants, and Expansion Material)

e. Marking Paint

f. Marking Reflective Media

g. Retroreflective Markers

h. Aggregate Samples and Test Results for Aggregate Base Material

i. HMAC Mix Designs

Terminal Building Standby Generator Project IFB: October 3, 2025

KSA-101: Page 4 of 4

j. Lime Certificates and Data for Material to be Used in Lime Stabilized Subgrade

k. Cement Certificates and Data for Material to be Used in Cement Stabilized Subgrade

l. Geotextile Fabric

m. Erosion Control Matting

n. Stabilized Construction Exit Material

o. Silt Fencing

p. Precast Headwalls and/or Safety End Treatments

q. Prime Coat

r. Tack Coat

s. Reinforced Concrete Pipe

t. Pipe Bedding Material

u. Storm Water Pollution Prevention Plan

v. Embankment Material

w. Topsoil

x. Electrical Components

y. Barricades

z. Runway Closure Markers

aa. Safety Plan Compliance Document (SPCD): The SPCD shall provide all the required information that is specified in FAA Advisory Circular 150/5370-2G – Operational Safety on Airports During Construction. Reference sections 1.3.2 and 1.4.3.1 in the aforementioned advisory circular for specific requirements.

END OF ITEM KSA-101

2024 Specifications 247

Texas Gulf Coast Regional Airport Flexible Base Terminal Building Standby Generator Project IFB: October 3, 2025

Tx247 - 1 of 5

Item 247 Flexible Base

1. DESCRIPTION

Construct a foundation course composed of flexible base.

2. MATERIALS

Furnish uncontaminated materials of uniform quality that meet the requirements of the plans and specifications. Notify the Engineer of the proposed material sources and of changes to material sources. The Engineer may sample and test project materials at any time before compaction throughout the duration of the project to assure specification compliance.

2.1. Aggregate. Furnish aggregate of the type and grade shown on the plans and meeting the requirements shown in Table 1. Each source must meet Table 1 requirements for liquid limit, plasticity index, and wet ball mill for the grade specified. Do not use additives, such as but not limited to lime, cement, or fly ash to modify aggregates to meet the requirements of Table 1, unless shown on the plans.

Unless otherwise shown on the plans, the unconfined compressive strength is waived when the flexible base material meets the #200 sieve requirement. When the #200 sieve requirement does not meet the specification in Table 1, the unconfined compressive strength is required.

Table 1 Material Requirements

2.1.1. Material Tolerances. The Engineer may accept material if no more than one of the five most recent gradation tests has an individual sieve outside the specified limits of the gradation. This allowance does not apply to the #200 sieve requirement.

Property Test Method Grade 1–23 Grade 3 Grade 4 Grade 5 Master gradation sieve size

(cumulative % retained)

Tex-110-E

As shown on the plans

2-1/2" 0 0 0 1-3/4" 0–10 0–10 0–5 7/8" 10–35 – 10–35 3/8" 30–65 – 35–65 #4 45–75 45–75 45–75 #40 65–90 50–85 70–90

#2001, 2 85–95 – – Liquid limit, % Max Tex-104-E 40 40 35

Plasticity index, Max Tex-106-E

10 12 10

Plasticity index, Min As shown on the plans

As shown on the plans

As shown on the plans

Wet ball mill, % Max Tex-116-E

40 – 40 Wet ball mill, % Max increase passing the #40 sieve 20 – 20

Min compressive strength2, psi

Tex-117-E lateral pressure 0 psi 35 – – lateral pressure 3 psi – – 90 lateral pressure 15 psi 175 – 175

1. The #200 sieve test is only required to meet the waiver of the unconfined compressive strength requirement. The #200 sieve test requirement is only applicable to stockpile samples from Section 247.2.4.

2. Compressive strength and #200 sieve test requirements are waived when the flexible base is mixed with or without existing material and treated with cement, emulsion, foamed asphalt, or lime, unless otherwise shown on the plans.

3. Grade 3 may be substituted for Grade 1–2 or Grade 5 when the flexible base is mixed with or without existing material and treated with cement, emulsion, foamed asphalt, or lime, as approved. The Grade 3 flexible base must meet the wet ball mill requirements of Grade 1–2 or Grade 5 as applicable.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi110.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi104.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi106.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi116.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi117.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx247 - 2 of 5

The Engineer may accept material if no more than one of the five most recent liquid limit or plasticity index tests is outside the specified limit. No single failing liquid limit or plasticity index test may exceed the allowable limit by more than 2 percentage points.

2.1.2. Material Types. Do not use fillers or binders unless approved. Furnish the type shown on the plans in accordance with the following.

2.1.2.1. Type A. Crushed stone produced and graded from oversize quarried aggregate that originates from a single, naturally occurring source. Do not use gravel or multiple sources.

2.1.2.2. Type B. Crushed or uncrushed gravel. Blending of two or more sources is allowed.

2.1.2.3. Type C. Crushed gravel with a minimum of 60% of the particles retained on a No. 4 sieve with two or more crushed faces as determined in accordance with Tex-460-A, Part I. Blending of two or more sources is allowed.

2.1.2.4. Type D. Type A material or crushed concrete. Crushed concrete containing gravel will be considered Type D material. Crushed concrete must meet the requirements of Section 247.2.1.2.6., “Recycled Material,” and be managed in a way to provide for uniform quality. The Engineer may require separate dedicated stockpiles to verify compliance.

2.1.2.5. Type E. Caliche, iron ore, or as otherwise shown on the plans.

2.1.2.6. Recycled Material. Reclaimed asphalt pavement (RAP) and other recycled materials may be used when shown on the plans. Request approval to blend two or more sources of recycled materials. When RAP is allowed, do not exceed 20% RAP by weight, unless otherwise shown on the plans. The percentage limitations for other recycled materials will be as shown on the plans.

Provide recycled materials, other than RAP, that have a maximum sulfate content of 3,000 ppm when tested in accordance with Tex-145-E. Certify compliance with DMS-11000, “Evaluating and Using Nonhazardous Recyclable Materials Guidelines.” In addition, recycled materials must be free of reinforcing steel and other objectionable material and have at most 1.5% deleterious material when tested in accordance with Tex-413-A. The liquid limit, plasticity index, wet ball mill, and compressive strength for all recycled materials are waived. When using RAP, crush RAP so that 100% passes the 2-in. sieve and does not exceed a maximum percent loss from decantation of 5.0% when tested in accordance with Tex-406-A. Test RAP without removing the asphalt. The final product must meet the requirements shown in Table 1 for the grade specified except when the Department requires a specific amount of Department-furnished RAP be added to the blend, unless otherwise shown on the plans.

The Contractor is responsible for uniformly blending the recycled material with the flexible base material to build a stockpile to meet the percentages required. Any Contractor-furnished surplus of recycled materials will remain the property of the Contractor. Remove Contractor-owned recycled materials from the project and dispose of them in accordance with federal, state, and local regulations before project acceptance.

2.2. Water. Furnish water free of industrial wastes and other objectionable matter.

2.3. Material Sources. Expose the vertical faces of all strata of material proposed for use when non-commercial sources are used. Secure and process the material by successive vertical cuts extending through all exposed strata, when directed.

2.4. Stockpile Approval. Stockpile is approved when the Engineer’s test results meet the material requirements shown in Table 1.

2.4.1. Sampling. The Contractor and the Engineer will sample flexible base from completed stockpiles in accordance with Tex-100-E. Personnel conducting sampling must be certified by the Department-approved soils and base certification program.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn460.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi145.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/11000_series/pdfs/11000.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn413.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn406.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi100.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx247 - 3 of 5

Sampling stockpiles may be located at the production site or at the project location. The Contractor will witness the Engineer’s sampling and sample the stockpile for their own testing, and label as deemed necessary.

Sample the stockpile for the Engineer when shown on the plans. When the Contractor samples the stockpile for the Engineer, the Engineer must witness the sampling of material designated for the Engineer and the Materials and Tests Division (MTD). The Engineer will label their sampling containers as “Engineer” and “MTD,” or as deemed necessary.

The Engineer will take immediate possession of the sample containers for the Engineer and MTD. The Engineer will maintain custody of the samples until all testing and reporting are completed.

2.4.2. Referee Testing. Referee testing is applicable for stockpile testing only. MTD is the referee laboratory. MTD may designate a laboratory from the Department’s MPL for Commercial Laboratories Approved for Flexible Base Referee Requests as the referee laboratory as deemed necessary. The designated laboratory cannot be performing any testing under this Item for the Engineer or Contractor.

The Contractor may request referee testing when the Engineer’s test results fail to meet any of the material requirements shown in Table 1 and the Contractor’s sample from Section 2.4.1., “Sampling,” for the same failing Department test, passes. The tests must be performed by a laboratory listed on the Department’s MPL for Commercial Laboratories Approved for Flexible Base Referee Requests. Submit the request by email within 5 working days after receiving failing test results from the Engineer. Include completed test reports passing the applicable requirements shown in Table 1 in the email.

Record and submit completed test reports electronically on Department-provided templates in their original format meeting the applicable material requirements shown in Table 1. Use Department-provided templates to record and calculate all test data. The Engineer and the Contractor will provide any available test results to the other party when requested.

3. EQUIPMENT

Provide machinery, tools, and equipment necessary for proper execution of the work.

3.1. Rollers. Provide rollers in accordance with Item 210, “Rolling.” Provide proof rollers in accordance with Item 216, “Proof Rolling,” when required.

3.2. Inertial Profiler. When ride quality measurement is required, provide a high-speed or lightweight inertial profiler certified at the Texas A&M Transportation Institute. Provide equipment certification documentation.

Display a current decal on the equipment indicating the certification expiration date.

4. CONSTRUCTION

Construct each layer uniformly, free of loose or segregated areas, and with the required density and moisture content. Provide a smooth surface that conforms to the typical sections, lines, and grades shown on the plans or as directed.

Stockpile base material temporarily at an approved location before delivery to the roadway. Build stockpiles in layers no greater than 2 ft. thick. Stockpiles must have a total height between 10 and 16 ft. unless otherwise approved. After construction and acceptance of the stockpile in accordance with Section 247.2.4., “Stockpile Approval,” loading from the stockpile for delivery is allowed. Load by making successive vertical cuts through the entire depth of the stockpile.

Do not add or remove material from temporary stockpiles that require sampling and testing before delivery, unless otherwise approved. Charges for additional sampling and testing required as a result of adding or removing material will be deducted from the Contractor’s estimates.

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx247 - 4 of 5

Haul approved flexible base in clean trucks. Deliver the required quantity to each 100-ft. station or designated stockpile site as shown on the plans. Prepare stockpile sites as directed. When delivery is to the 100-ft. station, manipulate in conformance with the applicable Items.

4.1. Preparation of Subgrade or Existing Base. Remove or scarify existing asphalt concrete pavement in accordance with Item 105, “Removing Treated and Untreated Base and Asphalt Pavement,” when shown on the plans or as directed. Shape the subgrade or existing base to conform to the typical sections shown on the plans or as directed.

When new base is required to be mixed with existing base, deliver, place, and spread the new flexible base in the required amount per station. Manipulate and thoroughly mix the new base with existing material to provide a uniform mixture to the specified depth before shaping.

Proof roll the roadbed in accordance with Item 216 before pulverizing or scarifying when shown on the plans or directed. Correct soft spots as directed.

4.2. Placing. Spread and shape flexible base into a uniform layer using an approved spreader the same day as delivered unless otherwise approved. Construct layers to the thickness shown on the plans. Maintain the shape of the course. Control dust by sprinkling, as directed. Correct or replace segregated areas as directed at no additional expense to the Department.

Place successive base courses and finish courses using the same construction methods required for the first course.

4.3. Compaction. Compact using density control unless otherwise shown on the plans. Multiple lifts are permitted when shown on the plans or approved. Bring each layer to the moisture content directed. When necessary, sprinkle the material in accordance with Item 204, “Sprinkling.” Maintain moisture during compaction within ±2.0% of the optimum moisture content as determined in accordance with Tex-113-E.

Begin rolling longitudinally at the sides and proceed toward the center, overlapping on successive trips by at least 1/2 the width of the roller unit. Begin rolling at the low side and progress toward the high side on superelevated curves. Offset alternating trips of the roller. Operate rollers at a speed between 2 and 6 mph as directed.

Rework, recompact, and refinish material that fails to meet or that loses required moisture, density, stability, or finish requirements before the next course is placed or the project is accepted. Continue work until specification requirements are met. Perform the work at no additional expense to the Department.

Before final acceptance, the Engineer will select the locations of tests and measure the flexible base depth in accordance with Tex-140-E. Correct areas deficient by more than 1/2 in. in thickness by scarifying, adding material as required, reshaping, recompacting, and refinishing at the Contractor’s expense.

4.3.1. Ordinary Compaction. Roll using approved compaction equipment as directed. Correct irregularities, depressions, and weak spots immediately by scarifying the areas affected, adding or removing approved material as required, reshaping, and recompacting.

4.3.2. Density and Moisture Control. Compact to a minimum of 100% of the maximum dry density and within ±2.0% of the optimum moisture content as determined in accordance with Tex-113-E, unless otherwise shown on the plans. Provide the Engineer with the beginning and ending station numbers of the area completed for testing. The Engineer will determine roadway density and moisture content of completed sections in accordance with Tex-115-E, Part I. The Engineer will determine random locations for testing in accordance with Tex-115-E, Part IV. Do not achieve density by drying the material after compaction.

When the density is less than 100% of the maximum dry density, the Engineer may perform additional testing to determine the extent of the area to correct. The Engineer may accept the section if no more than one of the five most recent density tests is below the specified density and the failing test is no more than 3 pcf below the specified density.

https://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi113.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi140.pdf https://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi113.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi115.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi115.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx247 - 5 of 5

4.3.3. Miscellaneous and Small Areas. Miscellaneous areas are those that typically involve handwork or discontinuous paving operations, such as temporary detours, driveways, mailbox turnouts, crossovers, gores, spot level-up areas, and other similar areas. Miscellaneous and small areas are not subject to density testing but may be tested as directed.

4.4. Finishing. After completing compaction, clip, skin, or tight-blade the surface using a maintainer or subgrade trimmer to a depth of approximately 1/4 in. Remove loosened material and dispose of it at an approved location. Seal the clipped surface immediately by rolling using a pneumatic tire roller until a smooth surface is attained. Add small increments of water as needed during rolling. Shape and maintain the course and surface in conformity with the typical sections, lines, and grades as shown on the plans or as directed.

Correct grade deviations greater than 1/4 in. in 16 ft. measured longitudinally. Correct grade deviations greater than 1/4 in. over the entire width of the cross-section in areas where surfacing is to be placed.

Correct by loosening and adding or removing material. Reshape and recompact in accordance with Section 247.4.3., “Compaction.”

4.5. Curing. Cure the finished section until the moisture content is at least 2 percentage points below optimum or as directed before applying the next successive course or prime coat.

4.6. Ride Quality. Measurement of ride quality only applies to the final travel lanes that receive a one- or two-course surface treatment for the final riding surface, unless otherwise shown on the plans. Measure the ride quality of the base course either before or after the application of the prime coat, as directed, and before placement of the surface treatment. Use a certified profiler operator listed on the Department’s MPL. When requested, furnish the Engineer with documentation for the person certified to operate the profiler.

Provide all profile data to the Engineer in electronic data files within 3 days of measuring the ride quality using the format specified in Tex-1001-S. The Engineer will use Department software to evaluate longitudinal profiles to determine areas requiring corrective action. Correct 0.1-mi. sections with an average international roughness index (IRI) value greater than 100 in. per mile to an IRI value of 100 in. per mile or less, unless otherwise shown on the plans. Reprofile and correct sections that fail to maintain ride quality before the placement of the surface treatment, as directed. Unless ride deterioration is due to environmental impact, traffic, or other incidents outside the Contractor’s control, perform this work at no additional expense to the Department, as approved.

5. MEASUREMENT

Flexible base will not be measured for separate pavement.

6. PAYMENT

The work performed and materials furnished in accordance with this Item will not be measured for separate payment, but will be subsidiary to the overall project.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/1000-S_series/pdfs/spe1001.pdf

2024 Specifications 421

Texas Gulf Coast Regional Airport Hydraulic Cement Concrete Terminal Building Standby Generator Project IFB: October 3, 2025

Tx421 - 1 of 17

Item 421 Hydraulic Cement Concrete

1. DESCRIPTION

Furnish hydraulic cement concrete for concrete pavements, concrete structures, and other concrete construction.

2. MATERIALS

Use materials from prequalified sources listed on the Department website. Provide aggregates from sources listed in the Department’s Concrete Rated Source Quality Catalog (CRSQC). Use materials from non-listed sources only when tested and approved before use. Allow 30 calendar days for the Engineer to sample, test, and report results for non-listed sources. Do not combine approved material with unapproved material.

2.1. Cement. Furnish cement in accordance with DMS-4600, “Hydraulic Cement.”

2.2. Supplementary Cementitious Materials (SCMs).

Coal Ash. Furnish sources of fly ash, modified fly ash (MFA), harvested coal ash (HCA), and ground bottom ash (GBA) in accordance with DMS-4610, “Coal Ash.”

Slag Cement. Furnish slag cement in accordance with DMS-4620, “Slag Cement.”

Silica Fume. Furnish silica fume in accordance with DMS-4630, “Silica Fume.”

Natural Pozzolans. Furnish natural pozzolans in accordance with DMS-4635, “Natural Pozzolans.”

2.3. Cementitious Material. Cementitious materials are the cement and SCMs used in concrete.

2.4. Chemical Admixtures. Furnish admixtures in accordance with DMS-4640, “Chemical Admixtures for Concrete.”

2.5. Water. Furnish mixing and curing water that is free of oils, acids, organic matter, or other deleterious substances. Water from municipal supplies approved by the Texas Department of Health will not require testing. Provide test reports showing compliance with Table 1 before use when using water from other sources.

Water that is a blend of concrete wash water and other acceptable water sources, certified by the concrete producer as complying with the requirements shown in Table 1 and Table 2, may be used as mix water. Test the blended water weekly for 4 weeks for compliance with Table 1 and Table 2 or provide previous test results. Then test every month for compliance. Provide water test results upon request.

Do not use mix water that has an adverse effect on the air-entraining agent, on any other chemical admixture, or on strength or time of set of the concrete. Use mixing and curing water free of iron and other impurities that may cause staining or discoloration when using white hydraulic cement.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/4000_series/pdfs/4600.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/4000_series/pdfs/4610.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/4000_series/pdfs/4620.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/4000_series/pdfs/4630.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/4000_series/pdfs/4635.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/4000_series/pdfs/4640.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx421 - 2 of 17

Table 1 Chemical Limits for Mix Water

Contaminant Test Method Max Concentration (ppm or mg\L)

Chloride (Cl) ASTM C1141 Prestressed concrete 500 Bridge decks & superstructure 500 All other concrete 1,000 Sulfate (SO4) ASTM C1141 2,000 Alkalis (Na2O + 0.658K2O) ASTM C1141 600 Total solids ASTM C1603 50,000

1. ASTM C114 includes reference and alternative test methods to measure the concentration of chlorides, sulfates, and alkalis in solutions prepared from dissolving cementitious materials. Use the applicable Test Methods in C114 to measure these constituents. The laboratory performing these tests is not required to conform to the method qualification requirements of Test Methods C114. Alternative instrumental and wet chemistry methods not listed in Test Methods C114 that measure the concentration of these chemical species in solution are permitted. When alternative methods are used, the test method used will be included in the report.

Table 2 Acceptance Criteria for Questionable Water Supplies

Property Test Method Limits Compressive strength, Min % control at 7 days ASTM C31, ASTM C391,2 90 Time of set, deviation from control, h:min. ASTM C403 From 1:00 early to 1:30 later

1. Base comparisons on fixed proportions and the same volume of test water compared to the control mix using 100% potable water or distilled water.

2. Base comparisons on sets consisting of at least two standard specimens made from a composite sample.

2.6. Aggregate.

2.6.1. Coarse Aggregate. Provide coarse aggregate consisting of durable particles of gravel, crushed blast furnace slag, recycled crushed hydraulic cement concrete, crushed stone, or combinations that are free of frozen material and injurious amounts of salt, alkali, vegetable matter, or other objectionable material, either free or as an adherent coating. Provide coarse aggregate of uniform quality throughout.

Provide coarse aggregate with the requirements shown in Table 3 unless otherwise shown on the plans.

Table 3 Coarse Aggregate Requirements

Description Test Method Limit Weight of clay lumps, % Max Tex-413-A 0.25 Weight of shale, % Max 1.0 Weight of laminate and friable particle, % Max 5.0 L.A. abrasion wear, % Max Tex-410-A 40 5-cycle magnesium sulfate soundness,1,2, non-air-entrained concrete, % Max Tex-411-A 25 5-cycle magnesium sulfate soundness,1,3, air-entrained concrete, % Max 18

Loss by decantation, % Max Tex-406-A 1.5

1. Recycled crushed hydraulic cement concrete is not subject to 5-cycle magnesium sulfate soundness requirements.

2. Allowed when air-entrained concrete is used at the Contractor’s option.

3. Only when air-entrained concrete is required by the plans.

Increase the loss by decantation limit to 3.0% for all classes of concrete and 5.0% for Class A, B, and P if the material finer than the No. 200 sieve is determined to be at least 85% calcium carbonate in accordance with Tex-406-A, Part III, in the case of coarse aggregates made primarily from crushing stone, unless otherwise shown on the plans. Provide test results upon request.

Provide coarse aggregate or combination of aggregates conforming to the gradation requirements shown in Table 4 when tested in accordance with Tex-401-A unless otherwise specified.

https://compass.astm.org/EDIT/html_annot.cgi?C114 https://compass.astm.org/EDIT/html_annot.cgi?C114 https://compass.astm.org/EDIT/html_annot.cgi?C114 https://compass.astm.org/EDIT/html_annot.cgi?C114 http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn413.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn410.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn411.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn406.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn401.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx421 - 3 of 17

Table 4 Coarse Aggregate Gradation Chart

Aggregate Grade No.1

Maximum Nominal

Size

Percent Passing on Each Sieve 2-1/2" 2" 1-1/2" 1" 3/4" 1/2" 3/8" #4 #8

1 2" 100 80–100 50–85 – 20–40 – – 0–10 – 2 1-1/2" – 100 95–100 – 35–70 – 10–30 0–10 – 3 1-1/2" – 100 95–100 – 60–90 25–60 – 0–10 –

4 (57) 1" – – 100 95–100 – 25–60 – 0–10 0–5 5 (67) 3/4" – – – 100 90–100 – 20–55 0–10 0–5 6 (7) 1/2" – – – – 100 90–100 40–70 0–15 0–5

7 3/8" – – – – – 100 70–95 0–25 – 8 3/8" – – – – – 100 95–100 20–65 0–10

1. Corresponding ASTM C33 gradation shown in parentheses.

2.6.2. Fine Aggregate. Provide fine aggregate consisting of clean, hard, durable particles of natural, manufactured sand; recycled crushed hydraulic cement concrete; slag; lightweight aggregate; or a combination thereof.

Provide fine aggregate free of frozen material and injurious amounts of salt, alkali, vegetable matter, or other objectionable material.

Provide fine aggregates in accordance with Table 5 unless otherwise shown on the plans.

Table 5 Fine Aggregate Requirements

Description Test Method Limit Weight of clay lumps, % Max Tex-413-A 0.50 Organic impurities1 Tex-408-A Color not darker than standard Sand equivalent, Min Tex-203-F 80 Fineness modulus Tex-402-A 2.3–3.1

1. Only when air-entrained concrete is specified.

Provide fine aggregate or combinations of aggregates conforming to the gradation requirements shown in Table 6 when tested in accordance with Tex-401-A unless otherwise specified.

Table 6

Fine Aggregate Gradation Chart (Grade 1) Sieve Size % Passing

3/8" 100 #4 95–100 #8 80–100

#16 50–85 #30 25–65 #50 10–351

#100 0–10 #200 0–32

1. 6–35 when sand equivalent value is greater than 85.

2. 0–6 for manufactured sand.

2.6.3. Intermediate Aggregate. Provide intermediate aggregate consisting of clean, hard, durable particles of natural, manufactured sand; slag; recycled crushed hydraulic cement concrete; lightweight aggregate; or a combination thereof when optimized aggregate gradation (OAG) concrete is specified or when used at the Contractor’s option. Provide intermediate aggregate free of frozen material and injurious amounts of salt, alkali, vegetable matter, or other objectionable material.

Provide intermediate aggregate in accordance with Table 7.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn413.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn408.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit203.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn402.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx421 - 4 of 17

Table 7

Intermediate Aggregate Requirements Description Test

Method Limit

Weight of clay lumps, % Max Tex-413-A 0.50 L.A. abrasion wear,1 % Max Tex-410-A 40 5-cycle magnesium sulfate soundness,1,2,3, non-air-entrained concrete, % Max Tex-411-A 25 5-cycle magnesium sulfate soundness,1,2,4, air-entrained concrete, % Max 18

Organic impurities5 Tex-408-A Color not darker than standard

Loss by decantation,1 % Max Tex-406-A 1.5

1. Applies only to the portion retained on the No. 4 sieve, if more than 30% of the intermediate aggregate is retained on the No. 4 sieve.

2. Recycled crushed hydraulic cement concrete is not subject to 5-cycle magnesium sulfate soundness requirements.

3. Allowed when air-entrained concrete is used at the Contractor’s option.

4. Only when air-entrained concrete is required by the plans.

5. Applies only to the portion passing the 3/8-in. sieve, if more than 30% of the intermediate aggregate is passing the 3/8-in. sieve.

For the portion retained on the No. 4 sieve, if more than 30% of the intermediate aggregate is retained on the No. 4 sieve, and in the case of aggregates made mainly from crushing stone, unless otherwise shown on the plans, the loss by decantation may be increased to 3.0% for all classes of concrete and 5.0% for Class A, B, and P if the material finer than the No. 200 sieve is determined to be at least 85% calcium carbonate in accordance with Tex-406-A, Part III. Provide test results upon request.

2.7. Mortar and Grout. Furnish pre-packaged grouts in accordance with DMS-4675, “Cementitious Grouts and Mortars for Miscellaneous Applications,” when specified for applications other than post-tension grouting.

When grouting or mortaring stone riprap is shown on the plans, provide mortar and grout consisting of one part hydraulic cement, two parts sand, and sufficient water to provide the desired consistency. Other mix proportions allowed as approved. Provide mortar with a consistency such that the mortar can be easily handled and spread by trowel. Provide grout of a consistency that will flow into and completely fill all voids.

Section 421.4.2.6., “Mix Design Options,” does not apply for mortar and grout.

2.8. Storage of Materials.

2.8.1. Cement and Supplementary Cementitious Materials. Store all cement and supplementary cementitious materials in weatherproof enclosures that will protect the materials from dampness or absorption of moisture.

When permitted, small quantities of packaged cementitious material may be stored in the open, on a raised platform, and under waterproof covering for up to 48 hr.

2.8.2. Aggregates. Handle and store concrete aggregates in a manner that prevents contamination by foreign materials. Clear and level the sites for the stockpiles of all vegetation if the aggregates are stored on the ground, and do not use the bottom 6-in. layer of aggregate without cleaning the aggregate before use.

Maintain separate stockpiles and prevent intermixing when conditions require the use of two or more grades of coarse aggregates. Separate the stockpiles using physical barriers where space is limited. Store aggregates from different sources in different stockpiles unless the Engineer authorizes pre-blending of the aggregates. Minimize segregation in stockpiles. Remix and test stockpiles when segregation is apparent.

Sprinkle stockpiles to control moisture and temperature as necessary. Maintain reasonably uniform moisture content in aggregate stockpiles.

2.8.3. Chemical Admixtures. Store admixtures in conformance with manufacturer’s recommendations in tanks that are clearly labeled and prevent admixtures from freezing.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn413.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn410.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn411.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn408.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn406.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/DMS/4000_series/pdfs/4675.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx421 - 5 of 17

3. EQUIPMENT

3.1. Concrete Plants and Mixing Equipment. Except for volumetric stationary plant or truck (auger) mixers, each plant and truck mixer must be certified by NRMCA or have an inspection report signed and sealed by a licensed professional engineer showing concrete measuring, mixing, and delivery equipment meets all requirements of ASTM C94. A new certification or signed and sealed report is required every time a plant is moved. Plants with a licensed professional engineer’s inspection require re-inspection every 2 yr. Provide a copy of the certification or the signed and sealed inspection report to the Engineer. Remove equipment or facilities from service until corrected when they fail to meet specification requirements.

When allowed as shown on the plans or by the Engineer, for concrete classes not identified as structural concrete in Table 8 or for Class C concrete not used for bridge-class structures, the Engineer may inspect and approve all plants and trucks instead of NRMCA or non-Department engineer-sealed certifications. The criteria and frequency of Engineer approval of plants and trucks are the same used for NRMCA certification.

Inspect and furnish inspection reports of the condition of blades and fins and their percent wear from the original manufacturer’s design for all mixing and agitating equipment annually. Repair mixing equipment exhibiting 10% or more wear before use. If an inspection within 12 mo. is not practical, a 2-mo. grace period (for a maximum of 14 mo. between inspections) is permitted.

3.1.1. Scales. Check all scales before beginning of operations, after each move, or whenever their accuracy or adequacy is questioned, and at least once every 6 mo. Immediately correct deficiencies, and recalibrate.

Provide a record of calibration showing scales in compliance with ASTM C94 requirements. Check batching accuracy of volumetric water batching devices at least every 90 days. Check batching accuracy of chemical admixture dispensing devices at least every 6 mo. Perform daily checks as necessary to ensure measuring accuracy. Check electronic aggregate moisture probes at least every 90 days in accordance with Tex-409-A, and be accurate to within 1.0% of the actual moisture content.

3.1.2. Volumetric Mixers. Provide volumetric mixers with rating plates defining the capacity and the performance of the mixer in accordance with the Volumetric Mixer Manufacturers Bureau or equivalent. Provide volumetric mixers that comply with ASTM C685. Provide test data showing mixers meet the uniformity test requirements in accordance with Tex-472-A.

Unless allowed on the plans or by the Engineer, volumetric truck (auger) mixers may not supply classes of concrete identified as structural concrete in Table 8.

3.1.3. Agitators and Truck and Stationary Mixers. Provide stationary and truck mixers capable of combining the ingredients of the concrete into a thoroughly mixed and uniform mass and capable of discharging the concrete so that the requirements of Tex-472-A are met.

Perform concrete uniformity tests on mixers or agitators in accordance with Tex-472-A as directed, to resolve issues of mix uniformity and mixer performance.

Perform the mixer or agitator uniformity test at the full rated capacity of the equipment. Remove all equipment that fails the uniformity test from service.

Inspect and maintain mixers and agitators. Keep them free of concrete buildup, and repair or replace worn or damaged blades or fins.

Ensure all mixers have a plate affixed showing manufacturer’s recommended operating speed and rated capacity for mixing and agitating.

Truck mixers with automated water and chemical admixture measurement and slump and slump flow monitoring equipment meeting the requirement of ASTM C94 will be allowed. Provide data every 6 mo.

substantiating the accuracy of slump, slump flow, temperature, water, and chemical admixture measurements. The slump measured by the automated system must be within 1 in. of the slump measured in accordance with Tex-415-A. The concrete temperature measured by the automated system must be within http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn409.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn472.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn472.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn472.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn415.pdf

Terminal Building Standby Generator Project IFB: October 3, 2025

Tx421 - 6 of 17

1°F of concrete temperature measured in accordance with Tex-422-A.