open access

https://hdl.handle.net/2115/40021

Test Method for Asphalt Cracking at Low Temperature

日本語

Thermal stress

1987-07-01

石油学会

石油学会誌

30(4)

273-276

This paper describes a new method measuring fracture temperatures of asphalts due to thermal stress at low temperatures (Moriyoshi Breaking Point Test) and reports test results on 9 kinds of straight asphalts. The test method follows; Asphalt, 50g (3mm thickness), each, is put in each of the two vessels (14cm diameter, 1cm depth) made of stainless steel, and, are heated to about 130℃, stirred with a spatula, then cooled to 45℃. One of the two vessels is immersed in a low temperature bath for one minute, and, the surface of asphalt is checked for cracks caused by thermal stress. In case a crack is found, its temperature is lowered and the procedure is repeated until the other specimen fails. The variance of the two breaking point temperatures should be less than 3℃. In case the variance is found to be equal to or greater than 3℃, the procedure is repeated until the objective is attained. This test was conducted for various variables, type of vessel, temperature gradient, thickness of asphalt. It is concluded that results of this test closely relate with the results of mechanical tests (Penetration Test, Softening Point Test). Further, results seem to be highly precise and scattering is far less than that obtained with Fraass Breaking Point Test.

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0582-4664

AN00130954