ntb2617bryan00035ad2.pdf

341-003

1 - 5 04-26 (Addendum No. 2) CSJ No. 2617BRYAN

Modification to Item 341 Dense-Graded Hot-Mix Asphalt

For this project, Item 341, “Dense-Graded Hot-Mix Asphalt,” of the Standard Specifications, is hereby amended with respect to the clauses cited below, and no other clauses or requirements of this Item are waived or changed hereby.

Section 341.2.1., “Aggregate.” The paragraph is supplemented by the following:

“Reclaimed Asphalt Pavement (RAP) and Processed Asphalt Shingle Material (RAS) will not be allowed on the project.”

Section 341.2.1.1., “Coarse Aggregate.” The first sentence in the fourth paragraph is supplemented by the following:

“The surface coarse aggregate minimum SAC shall be B.”

Section 341.2.4., “Asphalt Binder.” The paragraph is voided and replaced by the following:

“Furnish PG 64-22 asphalt binder in accordance with Section 300.2.10, “Performance-Graded Binders.” The JMF target asphalt content shall not be less than 5.3%.”

Section 341.2.5., “Tack Coat.” The first paragraph is voided and replaced by the following.

“Furnish CSS-1H, SS-1H, or a PG binder with a minimum high-temperature grade of PG 58 for tack coat binder in accordance with Item 300, “Asphalts, Oils, and Emulsions.” Specialized tack coat materials listed on the Department’s MPL are allowed or required when shown on the plans. Do not dilute emulsified asphalts at the terminal, in the field, or at any other location before use.”

Section 341.2.7.1., “RAP.” The section is voided in its entirety.

Section 341.2.7.2., “RAS.” The section is voided in its entirety.

Section 341.4.1., “Certification.” The paragraph is voided and replaced by the following.

Certification. Personnel certified by the Department-approved hot-mix asphalt certification program must conduct all mixture designs, sampling, and testing in accordance with Table 6. Supply the Engineer with a list of certified personnel and copies of their current certificates before beginning production and when personnel changes are made. Provide a mixture design developed and signed by a Level 2 certified specialist. Provide Level 1A certified specialists at the plant during production operations. Provide Level 1B certified specialists to conduct placement tests. Provide Level AGG101 certified specialists for aggregate testing.

Table 6, “Test Methods, Test Responsibility, and Minimum Certification Levels” is voided and replaced by the following.

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Table 6 Test Methods, Test Responsibility, and Minimum Certification Levels

Test Description Test Method Contractor Engineer Level1

1. Aggregate and Recycled Material Testing

Sampling Tex-221-F 1A/AGG101 Dry sieve Tex-200-F, Part I 1A/AGG101 Washed sieve Tex-200-F, Part II 1A/AGG101 Deleterious material Tex-217-F, Parts I & III AGG101 Decantation Tex-217-F, Part II AGG101 Los Angeles abrasion Tex-410-A TxDOT Magnesium sulfate soundness Tex-411-A TxDOT Micro-Deval abrasion Tex-461-A AGG101 Crushed face count Tex-460-A AGG101 Flat and elongated particles Tex-280-F AGG101 Linear shrinkage Tex-107-E AGG101 Sand equivalent Tex-203-F AGG101 Organic impurities Tex-408-A AGG101

2. Asphalt Binder & Tack Coat Sampling Asphalt binder sampling Tex-500-C, Part II 1A/1B Tack coat sampling Tex-500-C, Part III 1A/1B

3. Mix Design & Verification Design and JMF changes Tex-204-F 2 Mixing Tex-205-F 2 Molding (TGC) Tex-206-F 1A Molding (SGC) Tex-241-F 1A Laboratory-molded density Tex-207-F, Parts I & VI 1A Rice gravity Tex-227-F, Part II 1A Ignition oven correction factors2 Tex-236-F, Part II 2 Indirect tensile strength Tex-226-F 1A Hamburg Wheel test Tex-242-F 1A Boil test Tex-530-C 1A

4. Production Testing Selecting production random numbers Tex-225-F, Part I 1A Mixture sampling Tex-222-F 1A/1B Molding (TGC) Tex-206-F 1A Molding (SGC) Tex-241-F 1A Laboratory-molded density Tex-207-F, Parts I & VI 1A Rice gravity Tex-227-F, Part II 1A Gradation & asphalt binder content2 Tex-236-F, Part I 1A Control charts Tex-233-F 1A Moisture content Tex-212-F, Part II 1A/AGG101 Hamburg Wheel test Tex-242-F 1A Micro-Deval abrasion Tex-461-A AGG101 Boil test Tex-530-C 1A Abson recovery Tex-211-F TxDOT

5. Placement Testing Selecting placement random numbers Tex-225-F, Part II 1B In-place air voids Tex-207-F, Parts I & VI 1A In-place density (nuclear method) Tex-207-F, Part III 1B Establish rolling pattern Tex-207-F, Part IV 1B Control charts Tex-233-F 1A Ride quality measurement Tex-1001-S Note 3 Segregation (density profile) Tex-207-F, Part V 1B Longitudinal joint density Tex-207-F, Part VII 1B Thermal profile Tex-244-F 1B

1. Level 1A, 1B, AGG101, and 2 are certification levels provided by the Hot Mix Asphalt Center certification program.

2. Refer to Section 341.4.9.2.3., “Production Testing,” for exceptions to using an ignition oven.

3. Profiler and operator are required to be certified at the Texas A&M Transportation Institute facility when Surface

Test Type B is specified.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit221.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit200.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit200.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit217.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit217.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/cnn461.pdf 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/200-F_series/pdfs/bit280.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi107.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/cnn408.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/500-C_series/pdfs/aph500.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/500-C_series/pdfs/aph500.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit204.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit205.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit206.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit241.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit207.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit227.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit236.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit226.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit242.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/500-C_series/pdfs/aph530.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit225.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit222.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit206.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit241.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit207.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit227.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit236.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit233.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit212.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit242.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn461.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/500-C_series/pdfs/aph530.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit211.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit225.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit207.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit207.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit207.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit233.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/1000-S_series/pdfs/spe1001.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit207.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit207.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit244.pdf

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Section 341.4.5.2., Mixing and Discharge of Materials.” The first paragraph is voided and replaced by the following.

“Notify the Engineer of the target discharge temperature and produce the mixture within 25°F of the target. Monitor the temperature of the material in the truck before shipping to ensure that it does not exceed 350°F (or 275°F for WMA). The Department will not pay for or allow placement of any mixture produced above 350°F.”

This section is supplemented by the following:

“An automatic digital record printer is required at the plant. The batch weight ticket shall show the total weight of the batch and the weight of the asphalt. These tickets shall be given to the RPR at the end of each day’s production.”

Section 341.4.6., “Hauling Operations.” The paragraph is supplemented by the following:

“The Contractor shall assure the Engineer, in writing at the pre-paving conference, that adequate material will be available at the job site to ensure that starting and stopping of the paver is kept to an absolute minimum. Should the Engineer, in his opinion, determine this requirement is not being met, the Engineer may stop installation operations until satisfactory arrangements for delivery of sufficient material can be made.”

Section 341.4.7., “Placement Operations.” The fourth sentence of the second paragraph is voided and replaced by the following:

“Offset longitudinal joints of successive courses of hot mix by at least 12 inches.”

The third paragraph is supplemented by the following:

“Paved edges shall deviate by no more than 2 inches from a straight line along the edge. Straight edges may be produced by the Contractor using either a string set at the pavement edge, or by saw cutting the edge.

At crowns on rooftop hot mix sections and at valleys on inverted rooftop hot mix sections, break the lay-down machine screed so that the longitudinal pavement joint is at least 4 feet from the crown or valley, as applicable.

Bituminous Pavers shall be self-propelled, with an activated screed, which shall be heated as necessary, and shall be capable of spreading and finishing courses of bituminous plant mix material which will meet the specified thickness, smoothness, and grade.

The paver shall have sufficient power to propel itself and the hauling equipment without adversely affecting the finished surface.

The Contractor will be required to use automatic grade controls on the paver on this project.

Bituminous material shall not be placed against previously completed material that has a temperature below 175°F. If necessary, longitudinal joints shall be preheated by using an infrared heater attached to the paver ahead of the screed a sufficient distance to allow for proper preheating. Transverse joints shall be preheated to a minimum of 250°F using a portable infrared heater. The temperature of the bituminous material being preheated shall not exceed 300°F.”

Section 341.4.7.2., “Tack Coat.” The paragraph is voided and replaced by the following.

4.7.2.1. Application. Clean the surface before placing the tack coat. The Engineer will set the rate between 0.04 and 0.10 gal.

of residual asphalt per square yard of surface area. Apply a uniform tack coat at the specified rate unless otherwise directed. Apply the tack coat in a uniform manner to avoid streaks and other irregular patterns. Apply the tack coat to all surfaces the will come in contact with the subsequent HMA placement, unless otherwise directed. Allow adequate time for emulsion to break completely before placing any material. Prevent splattering of tack coat when placed adjacent to curb, gutter, and structures. Do not dilute emulsified asphalts at the terminal, in the field, or at any other location before use.

4.7.2.2. Sampling. The Engineer will obtain at least one sample of the tack coat binder per project in accordance with Tex-500-C, Part III, and test it to verify compliance with Item 300, “Asphalts, Oils, and Emulsions.” The Engineer will obtain the sample from the asphalt distributor immediately before use.

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For emulsions, the Engineer may test as often as necessary to ensure the residual of the emulsion is greater than or equal to the specification requirement in Item 300, “Asphalts, Oils, and Emulsions.”

Section 341.4.7.3.1.3., “Thermal Camera,” is voided and replaced by the following.

Take immediate corrective action to eliminate recurring moderate thermal segregation when a hand-held thermal camera is used. Evaluate areas with moderate thermal segregation by performing density profiles in accordance with Section 341.4.9.3.3.2., “Segregation (Density Profile).” Provide the Engineer with the thermal profile of every sublot within one working day of the completion of each lot. Report the results of each thermal profile in accordance with Section 341.4.2., “Reporting and Responsibilities.” When requested by the Engineer, provide the electronic files generated using the thermal camera. The Engineer will use a hand-held thermal camera to obtain a thermal profile at least once per project. No production or placement payment adjustments greater than 1.000 will be paid for any sublot that contains severe thermal segregation.

Suspend operations and take immediate corrective action to eliminate severe thermal segregation unless otherwise directed.

Resume operations when the Engineer determines that subsequent production will meet the requirements of this Section.

Evaluate areas with severe thermal segregation by performing density profiles in accordance with Section 341.4.9.3.3.2. Remove and replace the material in any areas that have both severe thermal segregation and a failing result for Segregation (Density Profile) unless otherwise directed. The sublot in question may receive a production and placement payment adjustment greater than 1.000, if applicable, when the defective material is successfully removed and replaced.

Section 341.4.8., “Compaction.” The second paragraph is supplemented by the following:

“All rollers shall be completely clean and free of soil, aggregate, asphalt, and all other materials which may damage or mar the hot mix in any way. Roller brushes, shoes, and water supply shall be in good condition and completely cover the roller from edge to edge.”

The third paragraph is supplemented by the following:

“The Contractor shall be required to have a testing lab representative, with a field density measuring gauge, in the field during HMA operations to assist the Contractor in his setting of his rolling pattern and to provide field densities during HMA construction.

Immediately after coring of the surface course has been completed, the Contractor shall clean the coring water and residue from the asphalt to prevent staining of the surface.”

The sixth paragraph is supplemented by the following:

“The Contractor shall provide a 12-foot straightedge for use by the RPR during the project.”

Section 341.4.9.2.2.2., “Asphalt Binder Sampling,” is voided and is not replaced.

Table 16, “Production and Placement Testing Frequency,” is voided and replaced by the following.

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Table 16 Production and Placement Testing Frequency

Description Test Method Minimum Contractor Testing Frequency

Minimum Engineer Testing Frequency

Individual % retained for #8 sieve and larger Tex-200-F or Tex-236-F

1 per sublot 1 per 12 sublots1Individual % retained for sieves smaller than #8 and larger than #200 % passing the #200 sieve Laboratory-molded density

Tex-207-F N/A 1 per sublot1Laboratory-molded bulk specific gravity In-place air voids VMA Tex-204-F Segregation (density profile)2 Tex-207-F, Part V 1 per sublot 1 per projectLongitudinal joint density Tex-207-F, Part VII Moisture content Tex-212-F, Part II When directed Theoretical maximum specific (Rice) gravity Tex-227-F N/A 1 per sublot1

Asphalt binder content Tex-236-F 1 per sublot 1 per lot1 Hamburg Wheel test Tex-242-F N/A

1 per project

Recycled Asphalt Shingles (RAS)3 Tex-217-F, Part III N/A Thermal profile2 Tex-244-F 1 per sublot

Asphalt binder sampling and testing Tex-500-C, Part II 1 per lot (sample only)

Tack coat sampling and testing Tex-500-C, Part III N/A Boil test4 Tex-530-C 1 per lot

1. For production defined in Section 341.4.9.4., “Exempt Production,” the Engineer will test one per day if 100 tons or more are produced. For Exempt Production, no testing is required when less than 100 tons are produced.

2. Not required when a thermal imaging system is used.

3. Testing performed by the Construction Division or designated laboratory.

4. The Engineer may reduce or waive the sampling and testing requirements based on a satisfactory test history.

Section 341.4.9.3.3.3., “Segregation (Density Profile).” The second paragraph is voided and replaced by the following.

Perform a minimum of one density profile per sublot. Perform additional density profiles when any of the following conditions occur, unless otherwise approved:

the paver stops for more than 60 sec.;

either the Contractor or the Engineer identifies areas with thermal segregation; or any visibly segregated areas exist.

Section 341.4.9.4., “Exempt Production.” The second paragraph is voided and replaced by the following.

For exempt production, the Contractor is relieved of all production and placement sampling and testing requirements, except for coring, and the production and placement pay factors are 1.000. All other specification requirements apply, and the Engineer will perform acceptance tests for production and placement listed in Table 14 when 100 tons or more per day are produced.

Section 341.5., “Measurement,” is voided and replaced by the following.

5.1 Dense Graded Hot-Mix Asphalt. Hot mix will be measured by the ton of composite hot-mix, which includes asphalt, aggregate, and additives. Measure the weight on scales in accordance with Item 520, “Weighing and Measuring Equipment.”

5.2 Tack Coat. Tack coat will be measured at the applied temperature by strapping the tank before and after road application and determining the net volume in gallons from the calibrated distributor. The Engineer will witness all strapping operations for volume determination. All tack, including emulsions, will be measured by the gallon applied.

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The Engineer may allow the use of a metering device to determine asphalt volume used and application rate if the device is accurate within 1.5% of the strapped volume.

Section 341.6., “Payment,” the first paragraph is voided and replaced with the following.

The work performed and materials furnished in accordance with this Item and measured as provided under Section 341.5.1, “Measurement,” will be paid for at the unit bid price for “Dense Graded Hot-Mix Asphalt” of the mixture type, SAC, and binder specified. These prices are full compensation for surface preparation, materials, placement, equipment, labor, tools, and incidentals.

Section 341.6., “Payment,” is supplemented by the following.

The work performed and materials furnished in accordance with this Item and measured as provided under Section 341.5.2, “Measurement,” will be paid for at the unit bid price for “Tack Coat” of the tack coat provided. These prices are full compensation for materials, placement, equipment, labor, tools, and incidentals.

Section 341.6.1.2., “Production Sublots Subject to Removal and Replacement.” This section is voided and replaced by the following.

The bulk specific gravity of each core will be divided by the Engineer’s average maximum theoretical specific gravity for that lot to determine the new payment adjustment factor of the sublot in question. If the new payment adjustment factor is 0.700 or greater, the new payment adjustment factor will apply to that sublot. If the new payment adjustment factor is less than 0.700, no payment will be made for the sublot. Remove and replace the failing sublot, or the Engineer may allow the sublot to be left in place without payment. The Engineer may also accept the sublot in accordance with Section 5.3.1., “Acceptance of Defective or Unauthorized Work.” Replacement material meeting the requirements of this Item will be paid for in accordance with this Section.

Section 341.6.3., “Total Adjusted Pay (TAP) Calculation.” The paragraph is supplemented by the following:

“No payment for Dense-Graded Hot-Mi Asphalt (HMA) shall be greater than 100 percent. However, payment in excess if 100 percent for any given accepted lots of HMA shall be used to offset payment for accepted lots of HMA that achieve a lot pay factor less than 100 percent. Tonnage amounts attributed to pavement mat thicknesses outside of the +/- 1/4-inches tolerance shall not be included in the TAP Calculation. The Design pavement mat thickness plus tolerance thickness will be included in the TAP Calculation.”

2024 Specifications 341

1 - 32 (Addendum No. 2)

Item 341 Dense-Graded Hot-Mix Asphalt

1. DESCRIPTION

Construct a hot-mix asphalt (HMA) pavement layer composed of a compacted, dense-graded mixture of aggregate, asphalt binder, and additives mixed hot in a mixing plant. Payment adjustments will apply to HMA placed under this Specification unless the HMA is deemed exempt in accordance with Section 341.4.9.4., “Exempt Production.”

2. MATERIALS

Furnish uncontaminated materials of uniform quality that meet the requirements of the plans and specifications.

Notify the Engineer of all material sources and before changing any material source or formulation. The Engineer will verify that the specification requirements are met and document all material source changes when the Contractor makes a source or formulation change. The Engineer may sample and test project materials anytime during the project to verify specification compliance in accordance with Item 6, “Control of Materials.”

2.1. Aggregate. Furnish aggregates from sources that conform to the requirements shown in Table 1 and this Section. Aggregate requirements in this Section, including those shown in Table 1, may be modified or eliminated when shown on the plans. Additional aggregate requirements may be specified when shown on the plans. Provide aggregate stockpiles that meet the definitions in this Section for coarse, intermediate, or fine aggregate. Aggregate from reclaimed asphalt pavement (RAP) is not required to meet Table 1 requirements unless otherwise shown on the plans. Supply aggregates that meet the definitions in Tex-100-E for crushed gravel or crushed stone. The Engineer will designate the plant or the quarry as the sampling location. Provide samples from materials produced for the project. The Engineer will establish the Surface Aggregate Classification (SAC) and perform Los Angeles abrasion, magnesium sulfate soundness, and Micro-Deval tests. Perform all other aggregate quality tests shown in Table 1. Document all test results in the mixture design report. The Engineer may perform tests on independent or split samples to verify Contractor test results. Stockpile aggregates for each source and type separately. Determine aggregate gradations for mixture design and production testing based on the washed sieve analysis in accordance with Tex-200-F, Part II. Reclaimed Asphalt Pavement (RAP) and Processed Asphalt Shingle Material (RAS) will not be allowed on the project.

2.1.1. Coarse Aggregate. Coarse aggregate stockpiles must have no more than 20% material passing the No. 8 sieve. Aggregates from sources listed in the Department’s Bituminous Rated Source Quality Catalog (BRSQC) are preapproved for use. Use only the rated values for HMA listed in the BRSQC. Rated values for surface treatment (ST) do not apply to coarse aggregate sources used in HMA. The surface coarse aggregate minimum SAC shall be B.

For sources not listed in the Department’s BRSQC:

build an individual stockpile for each material;

request the Department test the stockpile for specification compliance;

allow 30 calendar days for the Engineer to sample, test, and report results;

use only when tested and approved; and once approved, do not add additional material to the stockpile unless otherwise allowed by the

Engineer.

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi100.pdf https://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit200.pdf

2 - 32 (Addendum No. 2)

Provide coarse aggregate with at least the minimum SAC shown on the plans. SAC requirements apply only to aggregates used on the surface of travel lanes, unless otherwise shown on the plans. The SAC for sources in the Department’s Aggregate Quality Monitoring Program (AQMP) (Tex-499-A) is listed in the

BRSQC.

2.1.1.1. Blending Class A and Class B Aggregates. Class B aggregate meeting all other requirements shown in Table 1 may be blended with a Class A aggregate to meet requirements for Class A materials, unless otherwise shown on the plans. When blending Class A and Class B aggregates to meet a Class A requirement, ensure that at least 50% by weight, or volume if required, of the material retained on the No. 4 sieve comes from the Class A aggregate source, unless otherwise shown on the plans. Blend by volume if the bulk specific gravities of the Class A and Class B aggregates differ by more than 0.300. Coarse aggregate from RAP and recycled asphalt shingles (RAS) will be considered as Class B aggregate for blending purposes.

The Engineer may perform tests anytime during production, when the Contractor blends Class A and Class B aggregates to meet a Class A requirement. The Engineer will use the Department’s mix design template, when electing to verify conformance, to calculate the percent of Class A aggregate retained on the No. 4 sieve by inputting the bin percentages shown from readouts in the control room at the time of production and stockpile gradations measured at the time of production. The Engineer may determine the gradations based on either washed or dry sieve analysis from samples obtained from individual aggregate cold feed bins or aggregate stockpiles. The Engineer may perform spot checks to verify the percent of Class A aggregate retained on the No. 4 sieve. The Engineer will use the gradations supplied by the Contractor in the mixture design report as an input for the template. A failing spot check will require confirmation with a stockpile gradation determined by the Engineer.

2.1.1.2. Micro-Deval Abrasion. The Engineer will perform at least one Micro-Deval abrasion test in accordance with Tex-461-A for each coarse aggregate source used in the mixture design that has a rated source soundness magnesium (RSSM) loss value greater than 15 as listed in the BRSQC. The Engineer will perform testing before the start of production and may perform additional testing anytime during production. The Engineer may obtain the coarse aggregate samples from each coarse aggregate source or may require the Contractor to obtain the samples. The Engineer may waive all Micro-Deval testing based on a satisfactory test history of the same aggregate source.

The Engineer will estimate the magnesium sulfate soundness loss for each coarse aggregate source, when tested, using the following formula:

Mgest. = (RSSM)(MDact./RSMD) where:

Mgest. = magnesium sulfate soundness loss RSSM = rated source soundness magnesium MDact. = actual Micro-Deval percent loss RSMD = rated source Micro-Deval

When the estimated magnesium sulfate soundness loss is greater than the maximum magnesium sulfate soundness loss specified, the coarse aggregate source will not be allowed for use unless otherwise approved. The Engineer will consult the Materials and Tests Division, and additional testing may be required before granting approval.

2.1.2. Intermediate Aggregate. Aggregates not meeting the definition of coarse or fine aggregate will be defined as intermediate aggregate. Supply intermediate aggregates, when used, that are free of organic impurities.

Supply intermediate aggregate from coarse aggregate sources, when used, that meet the requirements shown in Table 1, unless otherwise approved.

Test the stockpile if 10% or more of the stockpile is retained on the No. 4 sieve, and verify that it meets the requirements in Table 1 for crushed face count (Tex-460-A) and flat and elongated particles (Tex-280-F).

http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn499.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn461.pdf 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/200-F_series/pdfs/bit280.pdf

3 - 32 (Addendum No. 2)

2.1.3. Fine Aggregate. Fine aggregates consist of manufactured sands, screenings, and field sands. Fine aggregate stockpiles must meet the fine aggregate properties in accordance with Table 1 and the gradation requirements in accordance with Table 2. Supply fine aggregates that are free of organic impurities. The Engineer may test the fine aggregate in accordance with Tex-408-A to verify the material is free of organic impurities. Unless otherwise shown on the plans, at most 10% of the total aggregate may be field sand or other uncrushed fine aggregate. Use fine aggregate, except field sand, from coarse aggregate sources that meet the requirements shown in Table 1, unless otherwise approved.

Test the stockpile if 10% or more of the stockpile is retained on the No. 4 sieve and verify that it meets the requirements in Table 1 for crushed face count (Tex-460-A) and flat and elongated particles (Tex-280-F).

Table 1 Aggregate Quality Requirements

Property Test Method Requirement Coarse Aggregate

SAC Tex-499-A (AQMP) As shown on the plans Deleterious material, %, Max Tex-217-F, Part I 1.5 Decantation, %, Max Tex-217-F, Part II 1.5 Micro-Deval abrasion, % Tex-461-A Note 1

Los Angeles abrasion, %, Max Tex-410-A 40 Magnesium sulfate soundness, 5 cycles, %, Max Tex-411-A 30

Crushed face count,2 %, Min Tex-460-A, Part I 85 Flat and elongated particles @ 5:1, %, Max Tex-280-F 10

Fine Aggregate Linear shrinkage, %, Max Tex-107-E 3 Sand equivalent, %, Min Tex-203-F 453

Organic impurities Tex-408-A Note 4

1. Used to estimate the magnesium sulfate soundness loss in accordance with Section 341.2.1.1.2., “Micro- Deval Abrasion.”

2. Only applies to crushed gravel.

3. The Department may perform Tex-252-F on fine aggregates not meeting this minimum requirement. Fine aggregates with a methylene blue value of 10.0 mg/g or less may be used.

4. Optional test.

Table 2 Gradation Requirements for Fine Aggregate

Sieve Size % Passing by Wt. Or Volume 3/8″ 100 #8 70–100

#200 0–30

2.2. Mineral Filler. Mineral filler consists of finely divided mineral matter such as agricultural lime, crusher fines, hydrated lime, or fly ash. Mineral filler is allowed unless otherwise shown on the plans. Use no more than 2% hydrated lime or fly ash, unless otherwise shown on the plans. Use no more than 1% hydrated lime if a substitute binder is used, unless otherwise shown on the plans or allowed. Test all mineral fillers except hydrated lime and fly ash in accordance with Tex-107-E to ensure specification compliance. The plans may require or disallow specific mineral fillers. Provide mineral filler, when used, that:

is dry enough, free-flowing, and free of clumps and foreign matter as determined by the Engineer;

does not exceed 3% linear shrinkage when tested in accordance with Tex-107-E; and meets the gradation requirements shown in Table 3, unless otherwise shown on the plans.

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/cnn460.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit280.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn499.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit217.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit217.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/400-A_series/pdfs/cnn461.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/cnn460.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit280.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi107.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/cnn408.pdf chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https:/ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit252.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi107.pdf https://ftp.txdot.gov/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi107.pdf

4 - 32 (Addendum No. 2)

Table 3 Gradation Requirements for Mineral Filler

Sieve Size % Passing by Wt. or Volume #8 100

#200 55–100

2.3. Baghouse Fines. Fines collected by the baghouse or other dust-collecting equipment may be reintroduced into the mixing drum.

2.4. Asphalt Binder. Furnish the type and grade of performance-graded (PG) asphalt binder shown on the plans that meets the requirements of Item 300, “Asphalts, Oils, and Emulsions.” Furnish PG 64-22 asphalt binder in accordance with Section 300.2.10, “Performance-Graded Binders.” The JMF target asphalt content shall not be less than 5.3%.

2.5. Tack Coat. Furnish CSS-1H, SS-1H, EBL, or a PG binder with a minimum high-temperature grade of PG 58 for tack coat binder in accordance with Item 300. Specialized tack coat materials on the MPL for Tracking Resistant Asphalt Interlayer (TRAIL) will be allowed or required when shown on the plans. Do not dilute emulsified asphalts at the terminal, in the field, or at any other location before use, unless required in conformance with the manufacturer’s recommendation for approved TRAIL products on the MPL Furnish CSS-1H, SS-1H, or a PG binder with a minimum high-temperature grade of PG 58 for tack coat binder in accordance with Item 300, “Asphalts, Oils, and Emulsions.” Specialized tack coat materials listed on the Department’s MPL are allowed or required when shown on the plans. Do not dilute emulsified asphalts at the terminal, in the field, or at any other location before use.

2.6. Additives. Use the type of additive specified when shown on the plans. Use the rate of additive specified in conformance with the manufacturer’s recommendation. Additives that facilitate mixing and compaction or improve the quality of the mixture are allowed when approved. Provide the Engineer with documentation such as the bill of lading showing the quantity of additives used in the project unless otherwise directed.

2.6.1. Lime and Liquid Antistripping Agent. Lime or liquid antistripping agent is required when shown on the plans. When lime or a liquid antistripping agent is used, add in accordance with Item 301, “Asphalt Antistripping Agents.” Do not add lime directly into the mixing drum of any plant where lime is removed through the exhaust stream unless the plant has a baghouse or dust collection system that reintroduces the lime into the drum.

2.6.2. Warm-Mix Asphalt (WMA). WMA is defined as HMA that is produced within a target temperature discharge range of 215°F and 275°F using approved WMA additives or processes from the MPL.

WMA is allowed for use on all projects and is required when shown on the plans. When WMA is required, the maximum placement or target discharge temperature for WMA will be set at a value at or below 275°F.

Department-approved WMA additives or processes may be used to facilitate mixing and compaction of HMA produced at target discharge temperatures above 275°F; however, such mixtures will not be defined as

WMA.

2.6.3. Compaction Aid. Compaction aid is defined as a Department-approved chemical warm-mix additive, denoted as “chemical additive” on the MPL, that is used to facilitate mixing and compaction of HMA at a discharge temperature greater than 275°F.

Compaction aid is allowed for use on all projects. Compaction aid is required when shown on the plans or as required in Section 341.4.7.1., “Weather Conditions.”

Warm-mix foaming processes, denoted as “foaming process” on the MPL, may be used to facilitate mixing and compaction of HMA at target discharge temperatures greater than 275°F; however, warm-mix foaming processes are not defined as a compaction aid.

5 - 32 (Addendum No. 2)

2.7. Recycled Materials. Use of RAP and RAS is permitted unless otherwise shown on the plans. Use of RAS is restricted to only intermediate and base mixes unless otherwise shown on the plans. Do not exceed the maximum allowable percentages of RAP and RAS in accordance with Table 4. The allowable percentages in accordance with Table 4 may be decreased or increased when shown on the plans. Determine the asphalt binder content and gradation of the RAP and RAS stockpiles for mixture design purposes in accordance with Tex-236-F, Part I. The Engineer may verify the asphalt binder content of the stockpiles anytime during production. Perform other tests on RAP and RAS when shown on the plans. Asphalt binder from RAP and RAS is designated as recycled asphalt binder. Calculate and ensure that the ratio of the recycled asphalt binder to total binder does not exceed the percentages in accordance with Table 5 during mixture design and HMA production when RAP or RAS is used. Use a separate cold feed bin for each stockpile of RAP and RAS during HMA production. Surface, intermediate, and base mixes referenced in Table 4 and Table 5 are defined as follows, unless otherwise shown on the plans.

Surface. The final HMA lift placed at the top of the pavement structure.

Intermediate. Mixtures placed below an HMA surface mix and less than or equal to 8.0 in. below the riding surface.

Base. Mixtures placed greater than 8.0 in. below the riding surface. Unless otherwise shown on the plans, mixtures used for bond breaker are defined as base mixtures.

2.7.1. RAP. RAP is salvaged, milled, pulverized, broken, or crushed asphalt pavement. Fractionated RAP is defined as a stockpile that contains RAP material with at least 95.0% passing the 1/2-in. sieve, before burning in the ignition oven, unless otherwise approved. The Engineer may allow the Contractor to use an alternate to the 1/2-in. screen to fractionate the RAP.

Use of Contractor-owned RAP, including HMA plant waste, is permitted unless otherwise shown on the plans. Department-owned RAP stockpiles are available for the Contractor’s use when the stockpile locations are shown on the plans. If Department-owned RAP is available for the Contractor’s use, the Contractor may use Contractor-owned fractionated RAP and replace it with an equal quantity of Department-owned RAP.

Department-owned RAP generated by required work on the Contract is available for the Contractor’s use when shown on the plans. Perform any necessary tests to ensure Contractor- or Department-owned RAP is appropriate for use. The Department will not perform any tests or assume any liability for the quality of the Department-owned RAP unless otherwise shown on the plans. The Contractor will retain ownership of RAP generated on the project when shown on the plans.

Do not use Department- or Contractor-owned RAP contaminated with dirt or other objectionable materials.

Do not use Department- or Contractor-owned RAP if the decantation value exceeds 5% and the plasticity index is greater than 8. Test the stockpiled RAP for decantation in accordance with Tex-406-A, Part I.

Determine the plasticity index in accordance with Tex-106-E if the decantation value exceeds 5%. The decantation and plasticity index requirements do not apply to RAP samples with asphalt removed by extraction or ignition.

Do not intermingle Contractor-owned RAP stockpiles with Department-owned RAP stockpiles. Remove unused Contractor-owned RAP material from the project site upon completion of the project. Return unused Department-owned RAP to the designated stockpile location.

Table 4 Max Allowable Amounts of RAP1

Max Allowable Fractionated RAP (%)

Surface Intermediate Base

20.0 30.0 35.0

1. Must also meet the recycled binder to total binder ratio shown in Table 5.

2.7.2. RAS. RAS is defined as processed asphalt shingle material from manufacturing of asphalt roofing shingles or from re-roofing residential structures. Post-manufactured RAS is processed manufacturer’s shingle scrap http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit236.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/soi106.pdf

6 - 32 (Addendum No. 2) byproduct. Post-consumer RAS is processed shingle scrap removed from residential structures. Use of post-manufactured RAS or post-consumer RAS (tear-offs) is not permitted in surface mixtures unless otherwise shown on the plans. RAS may be used in intermediate and base mixtures unless otherwise shown on the plans. Up to 3% RAS may be used separately or as a replacement for fractionated RAP in accordance with Table 4 and Table 5. RAS may be used separately or in conjunction with RAP. Comply with all regulatory requirements stipulated for RAS by TCEQ.

Process the RAS by ambient grinding or granulating such that 100% of the particles pass the 3/8-in. sieve when tested in accordance with Tex-200-F, Part I. Perform a sieve analysis on processed RAS material before extraction (or ignition) of the asphalt binder.

Add sand meeting the requirements of Table 1 and Table 2, or fine RAP, to RAS stockpiles if needed to keep the processed material workable. Any stockpile that contains RAS will be considered a RAS stockpile and be limited to no more than 3.0% of the HMA mixture in accordance with Table 4.

Certify compliance of the RAS with DMS-11000, “Evaluating and Using Nonhazardous Recyclable Materials Guidelines.” Treat RAS as an established nonhazardous recyclable material if it has not come into contact with any hazardous materials. Use RAS from shingle sources on the MPL. Remove all materials that are not part of the shingle, such as wood, paper, metal, plastic, and felt paper, before use. Determine the deleterious content of RAS material for mixture design purposes in accordance with Tex-217-F, Part III. Do not use RAS if deleterious materials are more than 0.5% of the stockpiled RAS, unless otherwise approved. Submit a sample for approval before submitting the mixture design. The Department will perform the testing for deleterious material of RAS to determine specification compliance.

2.8. Substitute Binders. No binder substitution will be allowed when shown on the plans. The Contractor may use a substitute PG binder shown in Table 5 instead of the PG binder originally specified, if using recycled materials, and if the substitute PG binder and mixture made with the substitute PG binder meet the following.

The substitute binder meets the specification requirements for the substitute binder grade in accordance with Section 300.2.11., “Performance-Graded Binders.”

The mixture has less than 10.0 mm of rutting on the Hamburg wheel test (Tex-242-F) after the number of passes required for the originally specified binder. Use of substitute PG binders may be allowed only at the discretion of the Engineer if the Hamburg wheel test results are between 10.0 mm and 12.5 mm.

Table 5 Allowable PG Binders and Max Recycled Binder Ratios

Originally Specified PG

Binder

Allowable Substitute PG Binder for Surface Mixes

Allowable Substitute PG Binder for Intermediate and Base Mixes

Maximum Ratio of Recycled Binder1 to Total Binder (%)

Surface Intermediate Base

76-22 70-22 70-22 15.0 25.0 30.0 70-22 Note 2 64-22 15.0 25.0 30.0 64-22 Note 2 Note 2 15.0 25.0 30.0 76-28 70-28 70-28 15.0 25.0 30.0 70-28 Note 2 64-28 15.0 25.0 30.0 64-28 Note 2 Note 2 15.0 25.0 30.0

1. Combined recycled binder from RAP and RAS. RAS is not permitted in surface mixtures unless otherwise shown on the plans.

2. No binder substitution is allowed.

3. EQUIPMENT

Provide required or necessary equipment in accordance with Item 320, “Equipment for Asphalt Concrete Pavement.”

https://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit200.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/200-F_series/pdfs/bit217.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit242.pdf

7 - 32 (Addendum No. 2)

4. CONSTRUCTION

Produce, haul, place, and compact the specified paving mixture. In addition to tests required in accordance with the Specification, the Contractor may perform other QC tests as necessary. Anytime during the project, the Engineer may perform production and placement tests as necessary in accordance with Item 5, “Control of the Work.” Schedule and participate in a mandatory pre-paving meeting with the Engineer on or before the first day of paving unless otherwise shown on the plans.

4.1. Certification. Personnel certified by the Department-approved HMA certification program must conduct all mixture designs, sampling, and testing in accordance with Table 6. Supply the Engineer with a list of certified personnel and copies of their current certificates before beginning production and when personnel changes are made. Provide a mixture design developed and signed by a Level 2-certified specialist. Provide Level 1A-certified specialists at the plant during production operations. Provide Level 1B-certified specialists to conduct placement tests. Provide Level AGG101-certified specialists for aggregate testing. Certification.

Personnel certified by the Department-approved hot-mix asphalt certification program must conduct all mixture designs, sampling, and testing in accordance with Table 6. Supply the Engineer with a list of certified personnel and copies of their current certificates before beginning production and when personnel changes are made. Provide a mixture design developed and signed by a Level 2 certified specialist. Provide Level 1A certified specialists at the plant during production operations. Provide Level 1B certified specialists to conduct placement tests. Provide Level AGG101 certified specialists for aggregate testing.

Table 6 Test Methods, Test Responsibility, and Min Certification Levels

Test Description Test Method Contractor Engineer Level1 Aggregate and Recycled Material Testing

Sampling Tex-221-F 1A/AGG101 Dry sieve Tex-200-F, Part I 1A/AGG101 Washed sieve Tex-200-F, Part II 1A/AGG101

Deleterious material Tex-217-F, Part I and Part III AGG101

Decantation Tex-217-F, Part II AGG101 Los Angeles abrasion Tex-410-A – Department Magnesium sulfate soundness Tex-411-A – Department Micro-Deval abrasion Tex-461-A – AGG101 Crushed face count Tex-460-A AGG101 Flat and elongated particles Tex-280-F AGG101 Linear shrinkage Tex-107-E AGG101 Sand equivalent Tex-203-F AGG101 Methylene blue test Tex-252-F – Department Bulk-specific gravity Tex-201-F AGG101 Organic impurities Tex-408-A AGG101

Asphalt Binder and Tack Coat Sampling Asphalt binder sampling Tex-500-C, Part II 1A/1B Tack coat sampling Tex-500-C, Part III 1A/1B

Mix Design and Verification Design and job-mix formula (JMF) changes Tex-204-F 2

Mixing Tex-205-F 2 Molding (Superpave gyratory compactor [SGC]) Tex-241-F 1A

Laboratory-molded density Tex-207-F, Part I and Part VI 1A

Rice gravity Tex-227-F, Part II 1A Ignition oven correction factors2 Tex-236-F, Part II 1A Indirect tensile strength Tex-226-F 1A Hamburg wheel test Tex-242-F 1A Witnessing mixing of correction factors Tex-236-F, Part III – Department http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit221.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit200.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit200.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit217.pdf http://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/200-F_series/pdfs/bit217.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…