Field Sampling and Testing of Asphalt Materials and Asphalt Mixtures Questions and Answers Best rated A+ Guaranteed Success

AASHTO R-66 Definition - Liquid asphalt MATERIALs include Asphalt Binder/Asphalt Cement and Asphalt Emulsion AASHTO R-97 Definition - Asphalt MIXTURES include concrete or Hot Mix Asphalt (HMA) Asphalt Binder - -Asphalt cement -High viscosity at ambient temperatures -Upon heating, becomes liquid and can be mixed with aggregates to produce HOT MIX ASPHALT (HMA) Emulsified Asphalt - -Mixture of Asphalt Binder, water, and emulsifying agent. -Liquid at ambient temperature -Primarily diluted and used for TACK COAT Emulsified Asphalt - Electrically Charged Particles - SS-1 SS-1h CSS-1 CSS-1h Anionic - Negative charge (SS) Cationic - Positive charge (CSS) Undiluted Emulsion Asphalt - Contains more asphalt (60%) per volume. (40% water) Diluted Emulsion Asphalt - Contains less asphalt (30%) per volume - Diluted 1 to 1(70%) water Hot Mix Asphalt Types - Hot Mix Asphalt Base Course (HMAB) and Hot Mix Asphalt (HMA) Pavements Hot Mix Asphalt Base Course (HMAB) also known as: - ACB or ATB Typical Surface Course Mixes of HMA: - - MIX IV -MIX V -SMA (Stone Matrix Asphalt) -PMA (Polymer Modified Asphalt) -Superpave 3 Principles of Sample - 1. Proper sampling is as important as proper testing 2. Small portions of the total material placed is test, so samples represent large investments 3. Sample must be RANDOMLY obtained and representative of the whole. Steps for Sampling Asphalt Materials: AASHTO R-66 - 1. Coordinate sampling with supplier or contractor 2. Use appropriate safety equipment and precautions 3. Use proper sample containers and label them correctly. 4. Achieve a consistent uniform flow by bleeding and discarding at least one gallon before obtaining a sample. 5. Protect samples from contamination and physical damage. (Emulsified Asphalt, protect the sample from freezingAsphalt Material (R 66) Sampling Locations - - Hot Mix Plants -Manufacturer/ Contractor's Storage Tank -Distributors