AASHTO T164:2014 Standard Method of Test for Quantitative Extraction of Asphalt Binder from Hot Mix Asphalt (HMA).
7.4. Terpene—Extractant. shall be nonhalogenated. nontoxic. and shall readily dissolve asphalt binder from HMA and place it into solution. This extractant shall be easily rinsed from the remaining aggregate without forming a gel, and the extractant rinsed from the aggregate shall pass readily through the diatomaceous earth and the filter.
7.5. When asphalt binder is intended to be extracted and then tested for additional properties, a reagent-grade solvent must be used (Note 3).
Note 3 —Non-reagent-grade solvents may contain epoxy resins that may affect the properties of the recovered binder. In particular, certain acid modified binders may be affected by non-reagent- grade solvents.
Note 4 —Only vented ovens should be used when terpene extractants are used.
The solvents listed in Section 7 should be used only under a hood or with an effective surface exhaust system in a well-ventilated area, because they are all toxic to some degree, as described in R 16. Trichloroethylene, methylene chloride, and normal-propyl bromide in the presence of heat and moisture may form acids that are extremely corrosive to certain metals, particularly when subject to contact over lengthy periods of time. Proper precautions should be taken to not allow these solvents to remain in small quantities in the effluent tanks of aluminum vacuum extractors.
8.2. Trichioroethylene stored in a steel container and in continuous contact with moisture may decompose by dehydrohalogenation to form unsaturated hydrocarbon liquids and hydrogen chloride. Steel drums containing trichloroethylene should be stored in a cool, dry location, kept tightly sealed, and opened as infrequently as possible. Trichioroethylene should be transferred from the drums to clean, dry, brown glass bottles for laboratory use. The hydrogen chloride in decomposed trichioroethylene may harden an asphalt during the extraction and Abson recovery test (R 59).
8.3. All local, state, and federal regulations must be followed when hauling, using, storing, and discarding extractants and rinse water. These requirements include fire ordinances as well as wastewater treatment regulations. The Material Safety Data Sheet should be followed closely to avoid fires and explosions. Storage of extractant-soaked rags should be prohibited.
Obtain samples in accordance with T 168.
9.2. Preparation of Test Specimens:
9.2.1. If the HMA is not sufficiently soft to separate with a spatula or trowel, place it in a large. flat pan, and warm it in a 110 ± 5°C (230 ± 9°F) oven only until it can be handled or separated. Split or quarter the material until the mass of material required for the test is obtained.
9.2.2. The size of the test sample shall be governed by the nominal maximum aggregate size of the HMA and confbrm to the mass requirement shown in Table 1 (Note 5).AASHTO T164 pdf download.