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What is the softening point of asphalt?
2015-07-09
The temperature at which an asphalt specimen softens upon heating and begins to sag. The test involves specific equipment and procedures, and different types of asphalt have different softening points. For engineering applications, the softening point of asphalt should not be too low or too high; otherwise, it may melt in summer, become brittle and crack in winter, and become difficult to work with. The softening point reflects the asphalt's viscosity, high-temperature stability, and temperature sensitivity.
The softening point of asphalt is determined by placing a specimen in a metal ring of specified dimensions, with a steel ball of prescribed size and mass positioned on top. The assembly is then immersed in water (5℃) or glycerin (32.5℃), and heated at a rate of 5 ± 0.5℃/min until the steel ball sinks to a specified distance (25.4 mm). The temperature at which this occurs, expressed in degrees Celsius, provides an indication, to some extent, of the asphalt's thermal stability.
When the softening point of the sample is less than 80℃, the allowable difference for repeatability tests is 1℃, and the allowable difference for reproducibility tests is 4℃.
When the softening point of the sample is equal to or greater than 80℃, the allowable difference for repeatability tests is 2℃, and the allowable difference for reproducibility tests is 8℃.
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