831.1 General Description
This section includes the requirements for the following Portland cement concrete and bituminous concrete admixtures: • Air-entraining admixtures • Chemical admixtures • Fly ash, raw or calcined natural pozzolan, slag, and microsilica • Heat-stable, anti-stripping additive • Silicone fluid
831.1.01 Related References
A. Standard Specifications Section 500—Concrete Structures Section 828—Hot Mix Asphaltic Concrete Mixtures Section 830—Portland Cement B. Referenced Documents AASHTO M 154 AASHTO M 194 AASHTO M 295 AASHTO M 302 AASHTO M 307 Federal Specification VV-D-1078B GDT 56 GDT 66 QPL 13 QPL 14 QPL 26 QPL 30 QPL 40
831.2 Materials
Use only admixtures that are listed on the specific Georgia Department of Transportation Qualified Products List (QPL). For a list of Heat Stable Anti-Stripping Additives sources, see QPL 26.
831.2.01 Air-Entraining Admixtures
A. Requirements Use air-entraining admixtures listed in QPL 13. Use air-entraining admixture materials meeting AASHTO M 154, Performance and Uniformity requirements. Test compression and flexure strengths at 7 and 28 days. Use air-entraining admixtures evaluated by the National Transportation Product Evaluation Program (NTPEP) test facility or other approved test facility. B. Fabrication General Provisions 101 through 150. C. Acceptance See requirements of AASHTO M 154. D. Material Warranty General Provisions 101 through 150.
831.2.02 Chemical Admixtures for Concrete
A. Requirements Use chemical admixtures listed in QPL 14. Use chemical admixture materials meeting AASHTO M 194 Physical requirements and Uniformity and Equivalence requirements for Types A, B, C, D, E, F, or G, unless otherwise specified. a. Waive the length change requirements. b. Ensure that the admixtures contain no more than 0.8 percent chloride, calculated as calcium chloride. c. Ensure that the air content does not exceed 4 percent when prepared in a standard batch without an added air-entraining agent. Use chemical admixtures evaluated by the National Transportation Product Evaluation Program (NTPEP) test facility or other approved test facility. B. Fabrication General Provisions 101 through 150. C. Acceptance See the requirements of AASHTO M 194 for chemical admixtures. D. Material Warranty General Provisions 101 through 150.
831.2.03 Fly Ash, Raw or Calcined Natural Pozzolan, Slag, and Microsilica
A. Requirements Fly Ash Fly ash is finely divided residue from the combustion of ground or powdered coal that is transported from the boiler by flue gases. Use fly ash that meets the requirements of AASHTO M 295, Class F or C and that are listed in QPL 30. Raw or Calcined Natural Pozzolan This is a siliceous or siliceous and aluminous material. Use Pozzolan that meets the requirements of AASHTO M 295, Class N and that are listed in QPL 30. Granulated Iron Blast-Furnace Slag This is a glassy granular material formed when molten blast-furnace slag is rapidly chilled and then finely ground. Use slag that meets the requirements of AASHTO M 302, Grade 100 or 120 and that are listed in QPL 30. Microsilica (Silica Fume) This is an amorphous material with high silica content and purity, made as a by-product of high purity quartz that is reduced with other ingredients in an electric-arc furnace. Use microsilica that meets the requirements of AASHTO M 307. B. Fabrication General Provisions 101 through 150. C. Acceptance The Engineer will select the laboratory tests for acceptance and project control. D. Material Warranty General Provisions 101 through 150.
831.2.04 Heat-Stable Anti-Stripping Additive
A. Requirements Use heat-stable, anti-stripping additives listed in QPL 26. Submit samples of the proposed heat-stable, anti-stripping additive, asphalt cement, and aggregates to the laboratory for approval before use. Ensure that materials meet the requirements of Section 828 for retained coating and tensile strength ratio when tested with GDT 56 and GDT 66, respectively. Do not use an additive that contains harmful ingredients or adversely alters the specified characteristics of the bituminous material when added in the recommended proportions. B. Fabrication General Provisions 101 through 150. C. Acceptance Test as follows: Test Method Retained coating GDT 56 Tensile strength ratio GDT 66 D. Material Warranty General Provisions 101 through 150.
831.2.05 Silicone Fluid
A. Requirements Use silicone fluid that meets Federal Specification VV-D-1078B, Viscosity Grade 1,000. For a list of sources, see QPL 40. B. Fabrication General Provisions 101 through 150. C. Acceptance See Federal Specification VV-D-1078B. D. Material Warranty General Provisions 101 through 150.
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