摘要
沥青混合料可视为由沥青砂浆和粗骨料组成的复合材料。为了预估沥青混合料的低温弹性模量,本研究采用两步法。第一步用试验方法,测试沥青砂浆的力学性能和参数,并与细观复合材料力学理论值进行对比。第二步把沥青砂浆低温弹性模量、粗骨料弹性模量以及其体积比等参数,按照细观力学模型,计算出沥青混合料的低温弹性模量。研究表明:采用4.75mm作为沥青砂浆的最大粒径,其低温弹性模量的实验值与计算值相近,该理论方法可靠有效。随着温度的降低,沥青砂浆的弹性模量增大。SBS改性沥青砂浆的低温弹性模量大于90号基质沥青砂浆的低温弹性模量,进一步应用细观力学广义自洽理论,可以合理预测出沥青混合料的低温弹性模量。
Asphalt mixture can be regarded as a composite material consisting of asphalt mortar and coarse aggregate.The paper adopts the two-step method to estimate the low-temperature elastic modulus of asphalt mixture.In the first step,the mechanical properties and parameters of the asphalt mortar were tested by the test method,and compared with the theoretical value of the meso composite.In the second step,the low temperature elastic modulus of the asphalt mixture was calculated according to the micromechanical model,such as the low temperature elastic modulus of the asphalt mortar,the elastic modulus of the coarse aggregate and the volume ratio.The results show that the elastic modulus of asphalt mortar increases with the decrease of temperature.taking 4.75 mm as the maximum particle size of asphalt mortar,the experimental value of the low temperature elastic modulus and the calculated value is similar,proving that the test method is reliable and effective.As the temperature decreases,the elastic modulus of the asphalt mortar increases.The low-temperature elastic modulus of SBS modified asphalt mortar is higher than that of 90-type matrix asphalt mortar,and the lowtemperature elastic modulus of asphalt mixture can be reasonably predicted by the generalized self-consistent theory of micromechanics.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2017年第5期125-131,共7页
Journal of Hebei Agricultural University
基金
国家自然科学基金(51078261)
内蒙古自治区交通运输厅科技项目(NJ-2015-29)
关键词
两步法沥青砂浆
低温试验
细观力学模型
广义自洽理论
two-step method
asphalt mortar
low temperature test
micromechanical model
generalized self-consistent theory
