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一、意义由于沥青混合料的强度随温度而改变,温度低时强度大,温度高时强度低,如图一,其值随所用沥青性质、矿料组成配比等而异,沥青质量好、矿料组成配比合理者,变化幅度小,反之变化幅度大。过去在材料试验中多以20℃与50℃的抗压强度比值R20/R50表示,称热稳系数。此值大说明热稳性差,因此必须控制沥青混合料的热稳性系数在一定的范围内,例如过去规定3或3.5。
First, the significance As the strength of asphalt mixture changes with temperature, low temperature, high strength, low strength at high temperature, as shown in Figure 1, the value with the nature of the asphalt used, mineral composition ratio and other differences, good asphalt quality, Mineral material composition ratio reasonable, small changes in amplitude, on the contrary, large changes. In the past in the material test to more than 20 ℃ and 50 ℃ compressive strength ratio R20 / R50 said that thermal stability. This value indicates a poor heat stability, so the asphalt mixture must be controlled for its thermal stability within a certain range, such as 3 or 3.5 in the past.