W912QR21R0002Specs-0002.pdf

CIVIL/OPS/ENVIRONMENTAL BR

ATTN: ADAM WANTLAND

600 DR M L KING JR PL RM 821

LOUISVILLE KY 40202-2236

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

Solicitation W912QR21R0002 for the construction of Rotary-Wing Helipad at Conroe, TX is hereby amended as follow s:

1. The follow ing Specif ication Sections have been replaced in their entirety:

32 11 13.13 LIME-FLY ASH TREATED SUBGRADE

2. The follow ing Specif ication Sections have been added:

31 32 19.16 GEOTEXTILE SOIL STABILIZATION

3. The proposal due date is hereby extended f rom Thursday, 22 April 2021 10:00 AM to Friday, 23 April 2021 at 10:00 AM Eastern Time.

1. CONTRACT ID CODE PAGE OF PAGES

1 2

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street , County, State and Zip Code) X W912QR21R0002

X 9B. DATED (SEE ITEM 11)

16-Mar-2021

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer X is extended, is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

U0002

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

20-Apr-2021

CODE

U. S. ARMY ENGINEER DISTRICT, LOUISVILLE

600 DR. MARTIN LUTHER KING, JR. PLACE

ROOM 821

LOUISVILLE KY 40202-2239

W912QR 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE 964860

FACILITY CODECODE

EMAIL:TEL:

W912QR21R0002Specs-0002

W912QR21R0002

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION 00 10 00 - SOLICITATION

The required response date/time has changed from 22-Apr-2021 10:00 AM to 23-Apr-2021 10:00 AM.

(End of Summary of Changes)

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad Conroe Army Reserve Aviation Base, Texas

SECTION 31 32 19.16

GEOTEXTILE SOIL STABILIZATION

02/21

Amendment 0002

AMENDMENT 002**************************************************************

PART 1 GENERAL

1.1 MEASUREMENT

Measure the as-built surface area, covered by geotextile, in square yards.

Allowance will be made for geotextile in anchor and/or drainage trenches but no allowance will be made for waste, overlaps, damaged materials, repairs, or materials used for the convenience of the Contractor.

1.2 PAYMENT

Geotextile installed and accepted will be paid for at the respective contract unit price in the bidding schedule. This unit price will include the cost of materials, equipment, installation, testing, and other costs associated with placement of the geotextile.

1.3 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D4354 (2012; R 2020) Sampling of Geosynthetics for Testing

ASTM D4355/D4355M (2014) Deterioration of Geotextiles from Exposure to Light, Moisture and Heat in a Xenon-Arc Type Apparatus

ASTM D4491/D4491M (2017) Standard Test Methods for Water Permeability of Geotextiles by Permittivity

ASTM D4533/D4533M (2015) Standard Test Method for Trapezoid Tearing Strength of Geotextiles

ASTM D4632/D4632M (2015a) Grab Breaking Load and Elongation of Geotextiles

ASTM D4751 (2020) Standard Test Method for Determining Apparent Opening Size of a Geotextile

ASTM D4759 (2011; R 2018) Standard Practice for Determining the Specification Conformance of Geosynthetics

ASTM D4873/D4873M (2017) Standard Guide for Identification, SECTION 31 32 19.16 Page 1

AMENDMENT 0002

Storage, and Handling of Geosynthetic Rolls and Samples

ASTM D6241 (2014) Standard Test Method for the Static Puncture Strength of Geotextiles and Geotextile-Related Products Using a 50-mm Probe

1.4 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" classification are for information only. When used, a code following the "G" classification identifies the office that will review the submittal for the Government.

Submit the following in accordance with Section 01 33 00.00 06 SUBMITTAL

PROCEDURES:

SD-03 Product Data

Thread

Manufacturing Quality Control Sampling and Testing

SD-04 Samples

Quality Assurance Samples and Tests

SD-07 Certificates

Geotextile

1.5 DELIVERY, STORAGE, AND HANDLING

Deliver, store, and handle geotextile in accordance with ASTM D4873/D4873M .

1.5.1 Delivery

Notify the Contracting Officer a minimum of 24 hours prior to delivery and unloading of geotextile rolls packaged in an opaque, waterproof, protective plastic wrapping. The plastic wrapping shall not be removed until deployment. If quality assurance samples are collected, immediately rewrap rolls with the plastic wrapping. Geotextile or plastic wrapping damaged during storage or handling shall be repaired or replaced, as directed. Label each roll with the manufacturer's name, geotextile type, roll number, roll dimensions (length, width, gross weight), and date manufactured.

1.5.2 Storage

Protect rolls of geotextile from construction equipment, chemicals, sparks and flames, temperatures in excess of 160 degrees F, or any other environmental condition that may damage the physical properties of the geotextile. To protect geotextile from becoming saturated, either elevate rolls off the ground or place them on a sacrificial sheet of plastic in an area where water will not accumulate.

1.5.3 Handling

Handle and unload geotextile rolls with load carrying straps, a fork lift

SECTION 31 32 19.16 Page 2

AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad with a stinger bar, or an axial bar assembly. Rolls shall not be dragged along the ground, lifted by one end, or dropped to the ground.

PART 2 PRODUCTS

2.1 RAW MATERIALS

A minimum of 7 days prior to scheduled use, submit manufacturer's certificate of compliance stating that the geotextile meets the requirements of this section. For needle punched geotextiles, the manufacturer shall also certify that the geotextile has been continuously inspected using permanent on-line full-width metal detectors and does not contain any needles which could damage other geosynthetic layers. The certificate of compliance shall be attested to by a person having legal authority to bind the geotextile manufacturer.

2.1.1 Geotextile

Provide geotextile that is a nonwoven pervious sheet of polymeric material consisting of long-chain synthetic polymers composed of at least 95 percent by weight polyolefins, polyesters, or polyamides. The use of woven slit film geotextiles (i.e., geotextiles made from yarns of a flat, tape-like character) will not be allowed. Add stabilizers and/or inhibitors to the base polymer, as needed, to make the filaments resistant to deterioration by ultraviolet light, oxidation, and heat exposure.

Regrind material, which consists of edge trimmings and other scraps that have never reached the consumer, may be used to produce the geotextile.

Post-consumer recycled material shall not be used. Geotextile shall be formed into a network such that the filaments or yarns retain dimensional stability relative to each other, including the edges. Geotextiles shall meet the requirements specified in Table 1. Where applicable, Table 1 property values represent minimum average roll values (MARV) in the weakest principal direction. Values for AOS represent maximum average roll values.

TABLE 1

MINIMUM PHYSICAL REQUIREMENTS FOR DRAINAGE GEOTEXTILE

PROPERTY UNITS ACCEPTABLE VALUES TEST METHOD

GRAB STRENGTH LBS 160 ASTM D4632/D4632M

PUNCTURE LBS 55 ASTM D6241

TRAPEZOID TEAR LBS 55 ASTM D4533/D4533M

APPARENT OPENING

SIZE

U.S. SIEVE No. 50 ASTM D4751

PERMITTIVITY SEC -1 0.05 ASTM D4491/D4491M

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AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad

TABLE 1

MINIMUM PHYSICAL REQUIREMENTS FOR DRAINAGE GEOTEXTILE

ULTRAVIOLET

DEGRADATION

PERCENT 50 AT 500 HRS ASTM D4355/D4355M

2.1.2 Thread

A minimum of 7 days prior to scheduled use, submit proposed thread type for sewn seams along with data sheets showing the physical properties of the thread. Construct sewn seams with high-strength polyester, nylon, or other approved thread type. Thread shall have ultraviolet light stability equivalent to the geotextile and the color shall contrast with the geotextile.

2.2 MANUFACTURING QUALITY CONTROL SAMPLING AND TESTING

The Manufacturer is responsible for establishing and maintaining a quality control program to assure compliance with the requirements of the specification. A minimum of 7 days prior to scheduled use, submit manufacturer's quality control manual. Documentation describing the quality control program shall be made available upon request. Perform manufacturing quality control sampling and testing in accordance with the manufacturer's approved quality control manual. As a minimum, geotextiles shall be randomly sampled for testing in accordance with ASTM D4354, Procedure A. Acceptance of geotextile shall be in accordance with ASTM D4759. Tests not meeting the specified requirements will result in the rejection of applicable rolls.

PART 3 EXECUTION

3.1 QUALITY ASSURANCE SAMPLES AND TESTS

3.1.1 Quality Assurance Samples

Provide assistance to the Contracting Officer in the collection of quality assurance samples for quality assurance testing; assign 7 days in the schedule to allow for testing. Collect samples upon delivery to the site at the request of the Contracting Officer and in accordance with ASTM D4354, Procedure B. Lot size for quality assurance sampling shall be considered to be the shipment quantity of the product or a truckload of the product, whichever is smaller. The unit size shall be considered one roll of geotextile. Identify samples with a waterproof marker by manufacturer's name, product identification, lot number, roll number, and machine direction. The date and a unique sample number shall also be noted on the sample. Discard the outer layer of the geotextile roll prior to sampling a roll. Samples shall then be collected by cutting the full-width of the geotextile sheet a minimum of 3 feet long in the machine direction. Rolls which are sampled shall be immediately resealed in their protective covering.

3.1.2 Quality Assurance Tests

Provide quality assurance samples to an Independent Laboratory. Samples will be tested to verify that geotextile meets the requirements specified in Table 1. Test method ASTM D4355/D4355M shall not be performed on the collected samples. Geotextile product acceptance shall be based on

SECTION 31 32 19.16 Page 4

AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad

ASTM D4759. Tests not meeting the specified requirements will result in the rejection of applicable rolls.

3.2 INSTALLATION

3.2.1 Subgrade Preparation

The surface underlying the geotextile shall be smooth and free of ruts or protrusions which could damage the geotextile. Subgrade materials and compaction requirements shall be in accordance with the project specifications.

3.2.2 Placement

Notify the Contracting Officer a minimum of 24 hours prior to installation of geotextile. Geotextile rolls which are damaged or contain imperfections shall be repaired or replaced as directed. The geotextile shall be laid flat and smooth so that it is in direct contact with the subgrade. The geotextile shall also be free of tensile stresses, folds, and wrinkles. On slopes steeper than 10 horizontal on 1 vertical, lay the geotextile with the machine direction of the fabric parallel to the slope direction.

3.3 SEAMS

3.3.1 Overlap Seams

Continuously overlap geotextile panels a minimum of 24 inches at all longitudinal and transverse joints. Where seams must be oriented across the slope, lap the upper panel over the lower panel. If approved, sewn seams may be used instead of overlapped seams.

3.4 PROTECTION

Protect the geotextile during installation from clogging, tears, and other damage. Damaged geotextile shall be repaired or replaced as directed.

Use adequate ballast (e.g., sand bags) to prevent uplift by wind. The geotextile shall not be left uncovered for more than 14 days after installation.

3.5 REPAIRS

Repair torn or damaged geotextile. Clogged areas of geotextile shall be removed. Perform repairs by placing a patch of the same type of geotextile over the damaged area. The patch shall extend a minimum of 12 inches beyond the edge of the damaged area. Patches shall be continuously fastened using approved methods. The machine direction of the patch shall be aligned with the machine direction of the geotextile being repaired.

Remove and replace geotextile rolls which cannot be repaired. Repairs shall be performed at no additional cost to the Government.

3.6 PENETRATIONS

Construct engineered penetrations of the geotextile by methods recommended by the geotextile manufacturer.

3.7 COVERING

Do not cover geotextile prior to inspection and approval by the

SECTION 31 32 19.16 Page 5

AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad

Contracting Officer. Place cover soil in a manner that prevents soil from entering the geotextile overlap zone, prevents tensile stress from being mobilized in the geotextile, and prevents wrinkles from folding over onto themselves. On side slopes, soil backfill shall be placed from the bottom of the slope upward. Cover soil shall not be dropped onto the geotextile from a height greater than 3 feet. No equipment shall be operated directly on top of the geotextile without approval of the Contracting Officer. Use equipment with ground pressures less than 7 psi to place the first lift over the geotextile. A minimum of 12 inches of soil shall be maintained between full-scale construction equipment and the geotextile.

Cover soil material type, compaction, and testing requirements are described in Section 31 00 00 EARTHWORK. Equipment placing cover soil shall not stop abruptly, make sharp turns, spin their wheels, or travel at speeds exceeding 5 mph.

**************************************************************AMENDMENT 002

-- End of Section --

SECTION 31 32 19.16 Page 6

AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad

SECTION 32 11 13.13

LIME-FLYASH TREATED SUBGRADE

11/19

Amendment 0002

AMENDMENT 002**************************************************************

PART 1 GENERAL

1.1 SUMMARY

The work specified consists of the construction of a lime-flyash subgrade course. Perform the work conforming to the lines, grades, notes, and typical sections shown in the drawings. Select sources of materials well in advance of the time when materials are required in the work.

1.2 UNIT PRICES

1.2.1 Waybills and Delivery Tickets

Submit certified waybills and delivery tickets for materials used. Submit copies of waybills or delivery tickets during the progress of the work.

Before the final payment is allowed, provide waybills and certified delivery tickets for lime-flyash used in the construction.

1.3 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO T 135 (2013; R 2017) Standard Method of Test for Wetting-and-Drying Test of Compacted Soil-Cement Mixtures

ASTM INTERNATIONAL (ASTM)

ASTM C25 (2017) Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime

ASTM C50/C50M (2013) Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone Products

ASTM C136/C136M (2019) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM C593 (2019) Standard Specification for Fly Ash and Other Pozzolans for Use With Lime for Soil Stabilization

ASTM C977 (2010) Quicklime and Hydrated Lime for

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AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad

Soil Stabilization

ASTM C1602/C1602M (2018) Standard Specification for Mixing Water Used in Production of Hydraulic Cement Concrete

ASTM D75/D75M (2019) Standard Practice for Sampling Aggregates

ASTM D1556/D1556M (2015; E 2016) Standard Test Method for Density and Unit Weight of Soil in Place by Sand-Cone Method

ASTM D1557 (2012; E 2015) Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3) (2700 kN-m/m3)

ASTM D1632 (2007) Standard Practice for Making and Curing Soil-Cement Compression and Flexure Test Specimens in the Laboratory

ASTM D3551 (2008) Laboratory Preparation of Soil-Lime Mixtures Using a Mechanical Mixer

ASTM D3740 (2019) Minimum Requirements for Agencies Engaged in the Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction

ASTM D4318 (2017; E 2018) Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils

ASTM D5102 (2009) Standard Test Method for Unconfined Compressive Strength of Compacted Soil-Lime Mixtures

ASTM D6938 (2017a) Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)

ASTM E11 (2020) Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves

NATIONAL LIME ASSOCIATION (NLA)

NLA BUL 326 (2004) Lime-Treated Soil Construction Manual: Lime Stabilization and Lime Modification

1.4 DEFINITIONS

1.4.1 Lime-Flyash Treated Course

Lime-flyash treated course is a mixture of lime-flyash and in-place or borrow material uniformly blended, wetted, and compacted to produce a pavement layer course that meets the criteria set forth in the plans.

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AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad

1.4.2 Degree of Compaction

Degree of compaction required is expressed as a percentage of the maximum density obtained by the test procedure presented in ASTM D1557, abbreviated as percent laboratory maximum density.

1.5 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" classification are for information only. When used, a code following the "G" classification identifies the office that will review the submittal for the Government.

Submit the following in accordance with Section 01 33 00.00 06 SUBMITTAL

PROCEDURES:

SD-03 Product Data

Plant, Equipment, Machines, and Tools; G

Submit a list of construction equipment 7 days prior to bringing equipment on the job.

Mix Design; G

Waybills and Delivery Tickets

Contractor's Plans; G

SD-04 Samples

Lime-Flyash

Submit a typical cured sample of on-site material with the required percent of lime-flyash content. Refer to ASTM C50/C50M for sample size requirements.

SD-05 Design Data

Job-Mix Formula; G

SD-06 Test Reports

Sampling and Testing

Field Density

SD-07 Certificates

Bituminous Material

Lime-Flyash

Laboratory

1.6 WEATHER LIMITATIONS

Do not construct subgrade when weather conditions detrimentally affect the quality of the materials. Do not apply lime-flyash unless the air

SECTION 32 11 13.13 Page 3

AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad temperature is at least 35 degrees F in the shade and rising. Protect the completed treated materials against freezing by a sufficient covering of straw, or by other approved methods, until the course has dried out.

Bring areas of completed treated materials that are damaged by freezing, rainfall, or other weather conditions to a satisfactory condition without additional cost to the Government.

1.6.1 Freeze Protection Method(s)

Submit Contractor's plans for freeze protection for approval.

1.7 DELIVERY AND STORAGE

Deliver lime-flyash in containers showing or including designated trade name, product identification, specification number, manufacturer's name, and source. Store in a manner that prevents moisture damage, overexposure, and contamination.

1.8 QUALITY ASSURANCE

1.8.1 Required Data

14 days prior to the commencement of the work, submit a job-mix formula (JMF) showing the amount of lime-flyash and water required per cubic yd, and procedures for blending the lime-flyash/subgrade mixture for each type of existing soil or for blended soil, as applicable. Include process type and number of: Lime-flyash applications, stages of mixing, slurry injection depths, mixing depths and depths of compaction lifts. Also, include a list of equipment to be used and their relation to method of mixing proportioning, spreading, pulverizing and compacting subgrade, slurry injection, jet slurry mixing and other related work. The formula contains the amount of lime-flyash, either in sacks or lbs per cubic yd and the amount of water to be used, if slurry method is used. Use ASTM D3551 laboratory test method.

PART 2 PRODUCTS

2.1 PLANT, EQUIPMENT, MACHINES, AND TOOLS

Submit list of proposed equipment to be used in performance of construction work including descriptive data for Government approval.

2.1.1 General Requisites

Plant, equipment, machines, and tools used in the work are subject to approval and maintained in satisfactory working condition. Allow use of other compacting equipment in lieu of that specified, where it can be demonstrated that the results are equivalent. Provide protective equipment, apparel, and barriers to protect the eyes, respiratory system, and the skin of workers exposed to contact with lime-flyash dust or slurry.

2.1.2 Steel-Wheeled Rollers

Use self-propelled steel wheeled rollers. Use tandem or 3-wheel self-propelled non-vibratory steel-wheel rollers or steel-wheel trailer not weighing less than 5 tons. When drive rolls or trailer rolls produce a compressive force of not less than 200 lbs per linear in of contact area, allow a roller weighing less than 5 tons to be used. Equip wheels of the rollers with adjustable scrapers. The use of vibratory rollers is

SECTION 32 11 13.13 Page 4

AMENDMENT 0002

P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad optional.

2.1.3 Tamping-Type Roller

Use a tamping type roller, under working conditions, having a minimum weight of 90 lbs per linear in of length of drum and a minimum load on each sheeps-foot of 100 psi of cross sectional area of the sheeps-foot in contact with the ground. Do not allow the maximum area of the face of each sheeps-foot to be more than 12 square in. Do not allow the feet on the sheeps-foot roller to project less than 7 in from the face of the drum, and equip the roller with teeth-cleaning devices. Space the feet in adjacent rows so that the distance from center to center of adjacent parallel rows is not less than 6 in nor more than 11 in. Do not allow individual drums of the roller to exceed 5 ft in width. Use drums that oscillate independently. Operate the and tractor for pulling at a speed of approximately 3 to 6 mph.

2.1.4 Mechanical Spreader

Use a self-propelled mechanical spreader or attached to a propelling unit capable of moving the spreader and material truck. Use a steerable device having variable forward and reverse speeds. Carry the spreader and propelling unit on tracks, rubber tires, or drum-type steel rollers that do not disturb the underlying material. Provide a spreader that conforms to the following:

a. Containing a hopper, an adjustable screed, and outboard bumper rolls;

b. Designed to have a uniform, steady flow of material from the hopper;

and

c. Capable of laying material without segregation, across the full width of the lane, to a uniform thickness and to a uniform loose density so that when compacted, the layer or layers conform to thickness and grade requirements indicated.

Provide a demonstration of the spreader prior to use in performance of the work.

2.1.5 Pulvimixer

Use self-propelled, four-wheel drive pulverizing and mixing equipment capable of pulverizing the soil in a single pass for the full depth to be stabilized. Use mixing action capable of uniformly blending and mixing the required lime-flyash content with the subgrade soil. Use a rotor capable of up or down cutting.

2.1.6 Slurry Mixer/Distributor

Mix the lime-flyash with water in trucks with approved distributors and applied as a thin water suspension or slurry. Apply commercial lime-flyash slurry with a lime-flyash percentage not less than that applicable for the grade used. Attain the distribution of lime-flyash by successive passes over a measured section of subgrade until the proper amount of lime-flyash has been spread. Use the amount of lime-flyash spread required for mixing to the specified depth that results in the percentage determined in the JMF. Use a distributor truck that continually agitates the slurry to keep the mixture uniform.

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2.1.7 Central Mixing Plant

Use a lime-flyash-slurry central mixing plant consisting of a lime-flyash storage silo, water supply tank, lime-flyash and water metering devices, and a lime-flyash-water mixer. Provide storage tanks for lime-flyash-water slurry with mechanical agitation to maintain the lime-flyash-water slurry in suspension.

2.1.8 Sprinkling Equipment

Provide sprinkling equipment consisting of tank trucks, pressure distributors, or other approved equipment designed to apply controlled quantities of water uniformly over variable widths of surface.

2.1.9 Tampers

Provide tampers of an approved mechanical type, having sufficient weight and striking power to produce the compaction required.

2.1.10 Straightedge

Provide and maintain at the site one 12 ft straightedge for use in the testing of the finished surface. Make available a straightedge for Government use. Use straightedges constructed of aluminum or other lightweight metal with blades of box or box-girder cross section with flat bottom reinforced to insure rigidity and accuracy. Use straightedges with handles to facilitate movement on pavement.

2.2 MATERIALS

2.2.1 Lime-Flyash

Submit copies of certified test data. Use a standard brand of lime-flyash conforming to ASTM C977 and ASTM C593 and the following physical and chemical requirements. Sample lime-flyash in accordance with ASTM C50/C50M.

a. Gradation that 97 percent passes a No. 30 sieve and a minimum of 75 percent passes a No. 200 sieve.

b. Combined calcium oxide and magnesium oxide not less than 90 percent.

c. Lime-flyash does not exceed 5 percent Carbon Dioxide or 2 percent free moisture (taken at the point of manufacture).

The percent of lime-flyash by weight of dry soil material is: 3 percent lime and 7 percent flyash by dry weight be used for estimating and planning. The percentages are given as application by dry weight and are typically equivalent to about 15 pounds of lime and 35 pounds of flyash per square yard per 6-inch depth. Lime-flyash is also available pre-mixed in percentages of 30 percent lime and 70 percent flyash. These pre-mixed products may be used if preferred at a rate of 50 pounds per square yard per 6-inch depth. The actual quantity of lime-flyash should be determined at the time of construction based on laboratory testing conducted using bulk samples of the subgrade soils.

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2.2.2 Bituminous Material

2.2.2.1 Material to be Treated

Use material to be treated consisting of in situ, borrow, or compacted fill material if preliminary earthwork is required: See Section 31 00 00 EARTHWORK. Provide material free of deleterious substances such as sticks, debris, organic matter, and stones greater than 3 in in any dimension. Confirm at least 10 percent of the material passes the No. 40 sieve.

2.2.2.2 Water

Use water clean, fresh, and free from injurious amounts of oil, acid, salt, alkali, organic matter, and other substances deleterious to the lime or soil-lime mixture and subject to approval. Test water for conformance to the requirements of ASTM C1602/C1602M including the optional requirements of Table 2. Allow potable water sources to be used without testing.

2.2.3 Stockpiling Materials

Stockpile borrow material, including approved material available from excavation and grading, in the manner and at the locations designated.

Before stockpiling material, clear storage sites and slope to drain.

Separately stockpile materials obtained from different sources.

2.2.4 Mix Design

Submit certification of testing laboratory compliance. Develop and submit for approval a proposed mix design for each material type to be treated at least 14 days before it is to be used. Obtain approval of the proposed mix designs from the Government prior to starting the work. Develop mix designs by an approved commercial laboratory which meets the requirements of ASTM D3740 and which has been approved by the Corps of Engineers Materials Testing Center. Develop the mix design using representative samples of each soil to be treated and using the proposed project lime.

Conduct three trials for each mix design tested. Prepare samples in accordance with ASTM D3551. Allow the prepared samples to mellow for 48 hours before testing is performed. For soil stabilization, vary the lime-flyash content to produce a maximum plasticity index of 10 when tested in accordance with ASTM D4318. Provide the results in a graph of plasticity index versus lime-flyash content. Determine the maximum dry density and optimum moisture content for the proposed lime-flyash-soil mixture in accordance with ASTM D1557. Cure samples at a constant moisture content and temperature for 28 days. Provide a soil stabilization mix design capable of producing an unconfined compressive strength of 150 psi at 28-days age (average of three specimens) when compacted to the design percent of laboratory maximum density and tested in accordance with ASTM D5102, Method A. Prepare three specimens per test evaluation for durability testing for each mix design tested. Do not allow samples to exceed loss indicated in Table 2 after 12 cycles of the wet-dry test in accordance with AASHTO T 135 . Provide the mix design submittal information including the following:

a. Material type.

b. Material classification including plasticity test data.

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c. Laboratory maximum density.

d. Percent of lime-flyash and rate of application.

e. Optimum water content during mixing, curing, and compaction.

f. Gradation of material before and after treatment.

g. Compressive strength.

h. Durability Wet-Dry test data.

i. Mixing or equipment requirements.

j. Mellowing time requirements.

k. Water quality test data, if non-potable source used.

Table 2

Type of Soil Stabilized

Maximum Allowable Weight Loss After 12 Wet-Dry or Freeze-Thaw Cycles, as a Percent of Initial Specimen Weight

Silt 8

Clays 6

PART 3 EXECUTION

3.1 LIME-FLYASH TREATED MIXTURE

Pulverize the subgrade material to be treated and, blend the mix at a moisture content below optimum. Confirm the proportions of the mixture are in accordance with the approved mix design after blending is completed. After blending, add water into the dry mix in amounts to bring the moisture content to a minimum of 5 percent above optimum. After mixing, control field moisture content within plus 2 or minus 1 percent of optimum. When the treated course is constructed in more than one layer, clean the previously constructed layer of loose and foreign matter by sweeping with power sweepers or power brooms. Allow hand brooms to be used in areas where power cleaning is not practicable. Provide adequate drainage during the entire construction period to prevent water from collecting or standing on the area to be treated or on pulverized, mixed, or partially mixed material. Provide line and grade stakes for control.

Place grade stakes in lines parallel to the centerline of the area under construction and suitably spaced for string lining.

3.2 OPERATION OF BORROW PITS

Obtain borrow material from offsite sources.

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3.3 PREPARATION OF AREA TO BE TREATED

Clean the area of debris, roots, thrash, organic and other deleterious materials. Perform clearing and grubbing as specified in Section 31 11 00 CLEARING AND GRUBBING. Remove rocks larger than 3 in. Inspect original ground for adequacy for the forthcoming compactive effort of lime-flyash treatment work. Inspect the area for adequate compaction and that it is capable of withstanding, without displacement, the compaction specified for the soil-lime-flyash mixture. Dispose of debris and removed unsatisfactory in-place material as specified. Rough grade and shape the area to be stabilized to conform to the lines, grades, and cross-sections indicated. Comply with subgrade requirements of Section 31 00 00

EARTHWORK.

3.3.1 In-Place Material to be Treated

Grade the entire area to conform to the lines, grades, and cross sections shown in the drawings prior to being processed. Make soft or yielding subgrade areas stable before construction is begun. Remove and replace unsatisfactory material as directed by the Government.

3.3.2 In-Place Material to Receive Treated Course

Use subgrade conforming to Section 31 00 00 EARTHWORK.

3.3.3 Grade Control

Excavate underlying material to sufficient depth for the required treated-course thickness so that the finished treated course with the subsequent surface course meets the fixed grade. When stabilized course is to be constructed to meet a fixed grade, provide adequate line and grade stakes for control. Locate grade stakes in lanes parallel to center line of areas under construction, and suitably placed for string lining.

Maintain line and grade. Confirm finished and completed stabilized area conform to the lines, grades, cross section, and dimensions indicated.

3.3.4 Soil Testing

Test original ground prior to scarification in accordance with ASTM D1557.

3.4 INSTALLATION

3.4.1 Mixed In-Place Method

3.4.1.1 Application Requirements

Comply with NLA BUL 326 and sequence of construction operations, unless specified otherwise.

After site preparation, scarify subgrade and spread lime-flyash. Blend lime-flyash into subgrade to required depth as indicated. Apply lime-flyash and water only to those areas where mixing operations can be completed during the same working day. Accomplish application and mixing of lime-flyash by either the dry placing method or the slurry method. Use same method during a single day's operation. Double application of lime-flyash is required; use between 2 and 3 percent of lime-flyash for the initial application. Apply curing seal as specified and allow 6 to 7 days curing.

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3.4.1.2 Scarifying and Pulverizing of Soil

Prior to application of lime-flyash, scarify and pulverize the soil.

Control scarification so that the layer beneath the layer to be treated is not disturbed. Do not exceed the depth of scarification with pulverizing. Remove organic materials such as stumps and roots. Remove rocks larger than 3 in.

3.4.1.3 Application of Lime-Flyash

Shape pulverized material to approximately the cross section indicated.

Apply lime-flyash so that when uniformly mixed with the soil, the specified lime-flyash content is obtained, and a sufficient quantity of lime-flyash-treated soil is produced to construct a compacted lime-flyash-treated course conforming to the lines, grades, and cross section indicated. Spread lime-flyash only on areas where the mixing operations can be completed during the same work shift or day. If lime-flyash is spread by hand, spot the bags accurately on the area being stabilized so that when the bags are opened the lime-flyash is dumped and spread uniformly on the area being processed. Limit hand spreading to areas inaccessible to mechanical spreaders. Do not permit equipment, except that used in spreading and mixing, to pass over the freshly applied lime-flyash.

a. Dry Placing: Spread and distribute lime-flyash at a uniform rate with protection from wind as an important distribution and timing criteria. Prevent dry lime-flyash from blowing by adding water to lime-flyash or by other suitable means. Do not apply lime-flyash when wind conditions are objectionable.

b. Slurry Method: Apply or inject mixture of lime-flyash and water into the existing soil. Maintain the water content at 5 percent above optimum during application to lime-flyash/soil mixture. Prepare hydrate slurry either in a central mixing tank or tank trucks, with agitation provided for mixing or using a jet slurry maker. Prepare slurry using a portable batch slaking unit. Accurately weigh or meter lime-flyash and water. Use standard water or asphalt trucks, properly cleaned, with or without pressure distributors, to apply lime-flyash treatment. Spread or inject lime-flyash slurry evenly to yield uniform distribution of lime-flyash throughout soil. Distribute lime-flyash in successive passes over subgrade materials until proper amount of lime-flyash has been spread or injected to proper depth.

Continually agitate slurry to keep mixture uniform. Keep pumps, distribution spray bars, slurry injection equipment and other equipment clean of excessive lime-flyash slurry. Verify the specified amount and rate of application of lime-flyash for the various materials encountered.

3.4.1.4 Initial Mixing

Distribute lime-flyash uniformly by mixing and pulverizing subgrade. Mix the lime-flyash and soil immediately after the lime-flyash has been distributed. Use sufficient initial mixing to alleviate dusting or wetting of the lime-flyash that might occur in the event of wind or rainstorms. During mixing, add water to subgrade to provide a moisture content of material and to insure chemical action of lime-flyash and subgrade materials. Make passes with the mixer until it has produced a homogenous, uniform mixture of lime-flyash, soil, and water. After initial mixing, control field moisture content within 2 percent of

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P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad optimum. Continue mixing or remixing operations, until material is free of streaks or pockets of lime-flyash and mixture is uniform as indicated by testing. After initial mixing, shape and roll subgrade lightly to seal surface in order to reduce evaporation of moisture and lime-flyash carbonation. Allow this to be accomplished several days in advance of the final application and mixing.

3.4.1.5 Water Application and Moist Mixing

Determine moisture content of the mixture in preparation for final mixing. Do not allow moisture in the mixture following final mixing to be less than the water content determined to be optimum based on dry weight of soil and or to exceed the optimum water content by more than 2 percentage points. Add water in increments as large as the equipment permits; however, partially incorporate such increments of water in the mix to avoid concentration of water near the surface. After the last increment of water has been added, continue mixing until the water is uniformly distributed throughout the full depth of the mixture, including satisfactory moisture distribution along the edges of the section. Mix soil in two stages, allowing for an intervening 24 to 48 hour mellowing period. Allow the treated mixture to mellow to allow the chemical reaction to alter (break down) the material. Identify the duration of this mellowing period in the mix design and base on soil type. After mellowing, remix the soil before compaction.

3.4.1.6 Two-Stage Pulverization and Mixing

After curing, pulverize lime-flyash treated material until soil particles pass a 1 in sieve and 60 percent pass the No. 4 sieve. If resultant mixture contains clods, reduce their size by scarifying, remixing, or pulverization to meet specified gradation. Compact lime-flyash-treated material immediately after final mixing and testing. Aerate or sprinkle to provide moisture content within 2 percent of optimum moisture content during compaction.

3.4.1.7 Preliminary Curing

Moisture cure lime-flyash-soil mixture up to 48 hours until adhesive quality of clay is reduced to almost normal soil consistency. Allow 7 days or more for curing heavy clays.

3.4.1.8 Confined Areas

In areas inaccessible to machinery, excavate soils to be treated and move to an area to perform machine mixing, process, and place back in the original location. Place material in its final location within 24 hours of initial mixing, and prior to final mixing and compaction.

3.4.2 Edges of Treated Course

Place approved material along the edges of the treated course in a quantity to compact to the thickness of the course being constructed, or to the thickness of each layer in a multiple-layer course, allowing at least a 1 ft width of the shoulder to be rolled and compacted simultaneously with the rolling and compacting of each layer of the treated course.

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3.4.3 Central-Plant Method

Provide a plant capable of producing a uniform lime-flyash-treated mixture at the specified lime-flyash and moisture contents. Haul the mixture to the job in trucks equipped with protective covers. Moisten underlying course, and place the mixture on the prepared area in a uniform layer with mechanical spreaders. Confirm the layer is uniform in thickness and surface contour; and confirm the completed layer, after compaction, conforms to the required grade and cross section.

3.4.4 Layer Thickness

Confirm the compacted thickness of the treated course is as indicated. Do not allow layers more than 8 in or less than 3 in in compacted thickness.

3.4.5 Compaction

Before compaction operations are started and as a continuation of the mixing operation, loosen and pulverize the mixture to the full depth.

Start compaction immediately after final mixing is completed. During final compaction moisten the surface and shape it to the required lines, grades, and cross section. Confirm the density of compacted mixture is at least 100 percent of laboratory maximum density. Base density value on a representative soil sample obtained from site and treated with required proportion of lime-flyash. Begin rolling at the outside edge of the surface and proceed to the center, overlapping on successive trips at least one-half the width of the roller. Make alternate trips of the roller slightly different lengths. Do not permit the speed of the roller to cause displacement of the mixture to occur. Compact areas inaccessible to the rollers with mechanical tampers; shape and finish the areas by hand methods. As compaction progresses, maintain the shape of the lifts by blading. Check that the surface upon completion is smooth and conforms to indicated section and established lines and grades. Perform initial compaction with sheeps-foot roller or other suitable roller. Perform final rolling by means of sheeps-foot or steel-tired.

3.4.6 Finishing

Finish the surface of the top layer to the grade and cross section shown in the drawings. Confirm the surface is of uniform texture. Allow light blading during rolling for the finished surface to conform to the lines, grades, and cross sections. Do not permit the surface to vary more than

0.5 inch above or below established grade. Finish completed section by rolling with a pneumatic or suitable roller sufficiently light to prevent hairline cracking. If the surface becomes rough, corrugated, uneven in texture, or traffic-marked prior to completion, scarify, rework, relay, or replace the unsatisfactory portions. If the course, when laid, becomes watersoaked, remove that portion immediately, and the mix placed in a windrow and aerated until a moisture content within the limits specified is obtained; and then spread, shaped, and rolled. Keep surface of each compacted layer or lime-flyash-treated material moist until covered by a subsequent layer of lime-flyash-treated material or curing seal.

3.4.7 Construction Joints

At the end of each working day, prepare a temporary joint in fully compacted material normal to paved surface centerline. Form a straight transverse construction joint by cutting back into the completed work to form a true vertical face free of loose or shattered material. Construct

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P2 467417 Conroe Army Reserve Air Base Rotary Wing Landing Pad a longitudinal temporary joint for partial width sections against which future material is to be placed. Remove temporary joints during next work period by trimming 3 in into treated material for continuity. Allow trimmed material to be incorporated in subsequent work. Do not allow temporary joints to coincide with longitudinal or transverse temporary joint location of previous or subsequent construction. Allow remixing 4 in into the previous day's work to be substituted for joints providing the method and equipment is acceptable. Remove and replace material along construction joints not properly compacted with soil-lime-flyash mixture that is mixed, moistened, and compacted as specified.

3.4.8 Final Curing

Immediately after the soil-lime-flyash area has been finished as specified above, protect the surface against rapid drying for 7 days by the application of a bituminous material.

Uniformly apply bituminous material by means of a bituminous distributor within a temperature range of 120 to 225 degrees F. Apply bituminous material in quantities of not less than 0.1 gal/square yd nor more than

0.25 gal/square yd. Properly treat areas inaccessible to or missed by the distributor using the manually operated hose attachment. Apply bituminous material only to the top layer. At the time the bituminous material is applied, check that the surface of the area is free of loose or foreign matter and contains sufficient moisture to prevent excessive penetration of the bituminous material. Sprinkle the area immediately before the bituminous material is applied. Dust the treated surface to prevent the bituminous material from being picked up by traffic.

3.5 SAMPLING AND TESTING

Submit calibration curves and related test results prior to using the device or equipment being calibrated. Provide copies of field test results within 24 hours after the tests are performed. Submit certified copies of test results of materials and sources not less than 30 days before material is required for the work.

3.5.1 General Requirements

Perform sampling and testing using an approved commercial testing laboratory or facilities which have been inspected by the Cement and Concrete Reference Laboratory (of ASTM/CCRL) within the past 3 years or by a Government approved independent commercial testing laboratory provided by the Contractor. The first inspection and subsequent inspections required because of failure of the facilities to pass the first inspection is at the expense of the Contractor. Perform sampling and testing using a laboratory frequency of sampling and testing of materials for conformance and quality control as specified and to be performed at such other times to document contract compliance. Provide certified copies of the test results within 24 hours of completion.

3.5.2 Results

Verify that results comply with the material specification. When the source of materials is changed or deficiencies are found, repeat the initial analysis including mix design studies if the material source is changed, and retest the material already placed to determine the extent of unacceptable material. Replace unacceptable in-place material.

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3.5.3 Sampling

Take aggregate samples for laboratory testing in accordance with ASTM D75/D75M. Take samples of lime-flyash in accordance with ASTM C50/C50M. Prepare specimens for the unconfined compression tests in accordance with ASTM D1632.

3.5.4 Sieve Analysis

Before starting work, test one sample of material to be treated in accordance with ASTM C136/C136M on sieves conforming to ASTM E11.