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Properties of modifiers for recycling of asphalt concrete should be such that the recycled asphalt will have properties essentially the same as neat asphalt with the least addition of modifier possible. Recommended specification requirements for a modifier include a flash point of 200°C Cleveland open cup (COC) min, a viscosity range of 90 to 300 cP at 60°C, and a composition of at least 9 percent polar compounds and 60 percent aromatic compounds as measured by the clay-gel procedure. Data presented demonstrate the utility of these limits and the detrimental effect of the addition of paraffinic oils. A procedure is presented for bracketing the amount of modifier required to soften an asphalt to a desired consistancy, and data are supplied which demonstrate the utility of this procedure.
bitumens, flexible pavements, asphalts, recycling, asphalt modifiers, Rostler analysis, clay-gel analysis, viscosity composition
President, PAX International, Spokane, Wash.
President, Las Vegas Paving, Las Vegas, Nev.