STP899: Changes in Asphalt Concrete Durability Resulting from Exposure to Multiple Cycles of Freezing and Thawing

    Gilmore, DW
    Research manager, research technician, research chemist, senior research technician, and marketing director, MORTON THIOKOL, Inc., Cincinnati, OH

    Darland, JB
    Research manager, research technician, research chemist, senior research technician, and marketing director, MORTON THIOKOL, Inc., Cincinnati, OH

    Girdler, LM
    Research manager, research technician, research chemist, senior research technician, and marketing director, MORTON THIOKOL, Inc., Cincinnati, OH

    Wilson, LW
    Research manager, research technician, research chemist, senior research technician, and marketing director, MORTON THIOKOL, Inc., Cincinnati, OH

    Scherocman, JA
    Research manager, research technician, research chemist, senior research technician, and marketing director, MORTON THIOKOL, Inc., Cincinnati, OH

    Pages: 16    Published: Jan 1985


    Abstract

    Concern over water-induced damage in asphalt concrete pavements has resulted in the development of several new moisture susceptibility detection tests. This report compares two modifications of the water conditioning procedure for asphalt concrete specimens as described in the National Cooperative Highway Research Program (NCHRP) Reports 192 and 246. These modifications incorporate longer water exposure conditions for investigating the long-term durability of antistripping additives and paving mixtures.

    Significant and progressive changes in tensile strength were found to occur when asphalt concrete specimens were repeatedly exposed to freeze-thaw cycles. Factors, such as aggregate source, additive type, and additive quantity, influence the rate of strength loss during cyclical conditioning, and these rates are valuable in material selection. In particular, the sensitivity of cyclical conditioning to additive effectiveness was utilized to develop and select improved additives.

    Keywords:

    bituminous cements, bituminous concretes, additives, diazonium salts, tensile strength, X-ray fluorescence, antistripping, continuous soaking, fatigue life, freeze-thaw cycle, moisture susceptibility, resilient modulus, tensile strength ratio (TSR), TSR loss rate, vacuum saturation


    Paper ID: STP35325S

    Committee/Subcommittee: D04.22

    DOI: 10.1520/STP35325S


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