for Highway Construction Page 619 of 71 5 SECTION 702 – ASPHALT
702.01 Asphalt .
Provide asphalt binder that meets AASHTO M 320, except as follows: 1.When polymer modification is specified or when the sum of the grade designation values exceed 90, perform the AASHTO T 301 test at 77°F (25°C) on residue from the rolling thin film oven test (RTFOT). The binder must have at least 50 percent elastic recovery.
2.On PAV conditioned material, the Dynamic She er AASHTO T 315 G* sin δ testing value will be 5,000 kPa maximum. Provide asphalt for a specified use from 1 supplier. If a change of supplier for asphalt binder is proposed or if blending of asphalt binder from more than 1 supplier is proposed, the Engineer will require mix design testing and verification before approved for use.
702.02 Polymer -Modified Emulsified Asphalts.
Meet the following:
1.Provide AASHTO M 316 quick -set polymer -modified CQS -1HP emulsion. Table 702.02- 4 – Test Requirements Test Method of Test Requirement Viscosity, SF, at 77 °F AASHTO T 59 20 – 100 seconds Residue by evaporation AASHTO T 59 62% minimum Residue softening point AASHTO T 53 135°F minimum Residue penetration at 77 °F AASHTO T 49 50 – 80 Before starting the emulsification process, mill or blend the polymer material into the asphalt or emulsifier solution. Ensure water has no harmful soluble salts and is of a quality that will not cause the asphalt to separate from the emulsion before microsurfacing is in place. Require the emulsion manufacturer to supply the additives. Add the additives as approved by the manufacturer to the emulsion mix or any component materials to provide the quick set properties and increase adhesion. The Department will consider the additives included as part of the mix design and must be certified as to their compatibility with the other mix components.
702.03 Emulsified Asphalts.
Meet the following:
1.AASHTO M 316.
2.AASHTO M 208.
3.Ensure rapid setting emulsion grades are homogenous after thorough mixing within 15 calendar days after delivery . for Highway Construction Page 620 of 71 5 4. Polymer modified cationic emulsified asphalts (CRS -2R and CRS -2L) are an emulsified blend of asphalt , polymer, water, and emulsifiers.
5.Table 702.03- 1 for CRS -2R emulsified asphalt including asphalt binder thoroughly blended with at least 1.5 percent total rubber solids.
6.Table 702.03- 2 for CRS -2P polymerized cationic emulsified asphalt . Mill the polymer into the asphalt or emulsion during the manufacturing of the emulsion.
7.Table 702.03- 3 for special tack emulsion (STE – 1). Table 702.03 -1 – CRS -2R Requirements Specifications AASHTO Test Property Minimum Maximum Number Tests on Emulsion: Viscosity, Saybolt Furol at 122°F, seconds 150 400 T 59 Storage stability test, 24 hours, percent — 1.0 Demulsibility 35 ml, 0.8% Dioctyl Sodium Sulfosuccinate, percent 40 — Particle charge test — Positive Sieve test, percent — 0.10 Distillation: Oil dis tillate by distillation: Oil distillate by volume of emulsion, percent — — — 3.0 — T 59 Residue by evaporation, percent 65 T 59 Method B Test on Residue from Distillation: Penetration, 77°F (25°C), 100 g, 5 sec onds 80 150 T 59 or T for Highway Construction Page 621 of 71 5 Table 702.03 -2 – CRS -2P Requirements Specifications AASHTO Test Property Minimum Maximum Number Tests on Emulsion: Viscosity, Saybolt Furol at 122°F, seconds 100 400 T 59 Storage stability test, 24 hours, percent — 1.0 Demulsibility 35 ml, 0.8% Dioctyl Sodium Sulfosuccinate, percent 40 — Particle charge test — Positive Sieve test, percent — 0.30 Distillation: Oil distillate by volume of emulsion, percent 0 3.0 T59 (a) Residue by evaporation, percent 65 — T 59 Method B Test on Residue from Distillation: Penetration, 77 °F, 3.5 oz., 5 sec onds 100 250 T 59, T 49 Torsional Recovery ( percent )(b) 18 — — or Elastic Recovery ( percent ) at 77°F (25°C) 45 — T 301
a.Distillation modified to use 300 grams of an emulsion heated to 350°F plus or minus 9°F and maintained for 20 minutes.
b.The torsional recovery test will be conducted in accordance with the California Department of Transportation Test Method 332. The Torsional Recovery test may be used instead of elastic recovery based on type of modifier used, at the option of the supplier. If the torsional recovery method is used for acceptance, the supplier must supply test data verifying specification conformance. for Highway Construction Page 622 of 71 5 Table 702.03 -3 – STE-1 Requirements Specifications AASHTO Test Property Minimum Maximum Number Tests on Emulsion: Viscosity @ 77 °F SFS — 30 T59 Storage Stability, 1 day, % — 1 Demulsibility 35 ml 0.8% dioctyl sodium sulfosuccinate, percent (a) 25 — Particle Charge Positive — Sieve Test, percent — 0.10 Distilla tion: Oil distillate by volume of emulsion, percent — 5 T59 Test on Residue, percent 45 — T59 Penetration 77°F 100 200 T59 Ductility, 77 °F, 5 cm/minute, cm 40 — T59 Solubility in Trichloroethylene (percent) 97.5 — T59
a.Perform the demulsibility test within 30 days from date of shipment.
702.04 Anti-Stripping Additive .
Use liquid anti -strip additive or hydrated lime as follows:
1.Treat PG binder products with a heat -stable, anti -stripping additive . Determine an amount of a nti- stripping additive per ton of asphalt to achieve passing test results and maintain that amount throughout production. If the asphalt mixture requires anti -stripping additive, the asphalt binder samples will be tested in accordance with Idaho IT 99. Remove material that does not show the presence of anti -stripping additive. Submit samples of the proposed liquid anti -strip additive and asphalt for approval before use. The Engineer will test the material in accordance with Idaho IT 137 for acceptance.
2.Use hydrated lime as a plant mix additive that meets 720.06.
702.05 Loading Certificate .
Accompany each shipment of asphalt with a copy of the loading certificate providing the following information:
1.Contractor and project number.
2.Refinery.
3.Supplier, if other than refinery.
4.Car or delivery ticket number.
5.Type and grade of asphalt . for Highway Construction Page 623 of 715 6. Specific gravity.
7.Temperature when loaded.
8.Shipment:
a.Truck. Individual certified weights of each loaded truck and trailer and the tare weight of each vehicle. Indi vidual compartment asphalt weight must be certified for multiple compartment hauling units.
b.Railroad Car. Certified volume of asphalt load. Compute the weight from the volume corrected as specified in 109.01.A.7.
9.Consi stency of material:
a.Saybolt viscosity of emulsified asphalt .
b.Performance Graded Binder. With each lot change, attach a copy of the ITD -966 form for PG binder supplier’s certification as requir ed by 702.08.
10.The authorized refinery or supplier representative’s signature.
11.When an anti -stripping additive is specified, the percentage of additive by weight of asphalt and the brand, grade, or ty pe of additive.
12.Lot number for PG binders.
702.06 Sampling and Testing.
Sample asphalt in accordance with AASHTO R 66. Test asphalt in accordance with appropriate AASHTO and ASTM test methods for the type of asphalt. Check the presence of anti -stripping additive in accordance with Idaho IT 99.
702.07 Temperature Viscosity Curve.
Accompany each shipment of asphalt with a copy of the temperat ure viscosity curve .
702.08 Asphalt Certification .
The Department requires the Contractor’s supplier to:
1.Annually submit a process control plan (quality control plan) to the Cent ral Materials Laboratory for review.
2.Certify the performance graded (PG) binder supplied meets the specified grade when tested in accordance with AASHTO M 320 and 702.01 and emulsi fied asphalts s upplied meet 702.03.
3.Perform QC testing for large bulk tanks of PG 58- 28 at least monthly.
4.Perform at least 1 complete set of quality control tests for each storage tank of polymerized PG binder produced.
5.For poly merized PG binder produced by in- line blending, outline consistency and specification compliance testing frequency in the supplier’s quality control plan for the Central Materials Laboratory ’s approval. for Highway Construction Page 624 of 715 6. Perform complete specification testing for PG binder at least monthly and submit a copy of each test report to the Central Materials Laboratory . Base the testing freque ncies on consistent raw materials and production processes. If a change occurs to the raw materials or the production process, the Department requires a new set of complete specification testing. Use only supplier blended polymerized PG binders. Do not int roduce modifiers/polymers at the asphalt mix plant, unless a QC/QA program has been submitted by the supplier and approved by the Central Materials Laboratory . for Highway Construction Page 625 of 71 5 SECTION 703 – AGGREGATES
703.01 General Requirements.
Provide aggregates that are reasonably without wood, roots, bark, soft or disintegrated pieces, or other detrimental matter. Aggregate sources must meet the requirements of 106.09. Round the percent passing gradations to the nearest whole number, except report the percent passing the No. 200 sieve to the nearest tenth of a percent.
703.02 Concrete Aggregate .
Meet the following requirements for concrete aggregate :
A.General. Use a fine and coarse concrete aggregate that meets the requirements in Table 703.02- 1. Table 703.02 -1 – General Concrete Aggregate Criteria Chara cteristic Test Method Requirements Idaho Degradation Idaho IT 15 5.0% maximum loss Ethylene Glycol Idaho IT 116 90% minimum retained Sodium Sulfate Soundness (a) AASHTO T 104 Maximum 10% loss for fine aggregate and 12% loss for coarse aggregate after 5 cycles
a.Perform sodium sulfate soundness testing when directed. Do not use limestone for fine or coarse aggregate in concrete wearing surfaces. Perform AASHTO T 380, ASTM C 1293, or ASTM C295 testing to determine the potential alkali silica reactivity. The Department will require mitigating measures for aggregates found to be reacti ve or potentially reactive in accordance with AASHTO T 380 (Table 703.02- 2), ASTM C 1293, or ASTM C295. Potentially reactive aggregates are those with expansion greater than 0.04 percent as determined by ASTM C 1293 and AASHTO T 380. If ASTM C295 indicates an aggregate composition containing a percentage of the following materials greater than shown in Table 703.02-3 , the Engineer will consider the aggregate potentially reacti ve. Table 703.02 -2 - Aggregate Reactivity Ev aluation (AASHTO T380) – no mitigation Expansion (Min %) Expansion (Max %) @ 56 days Additional Testing Required Avg. 2 -week expansion from 56 to 84 days (%) Degree of Reactivity Min Max 0.0 0.030 no Non-reactive 0.031 0.040 yesc 0 0.010 Non-reactive 0.031 0.040 yesc 0.011 N/A low/slow reactive
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 655–660 of 768.