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A shell sliding plate microviscometer with improved steel plates was used for low-temperature testing of asphalt but was found to be inadequate for the stresses imposed. There is need for low-temperature viscosity values to establish properties influential in determining resistance to thermal cracking of asphalt concrete pavements. Manufacturers should redesign a microviscometer to withstand the stresses imposed by low-temperature testing.
asphalts, concrete pavements, bituminous concretes, low temperature tests, microviscometer, instruments, sliding plate microviscometer, thermal cracking, viscosity, bitumens
Dean of engineering, University of Wisconsin-Platteville, Platteville, Wis.
Professors of civil engineering, University of Wisconsin, Madison, Wis.