沥青混合料紫外光老化评价指标的研究
发布时间：2019-04-09 11:57
【摘要】：为了提出沥青混合料紫外光老化评价指标,通过沥青砂来研究沥青混合料的流变特性,制作沥青砂试件进行室内加速紫外光老化试验,分别进行0、2、4、6、8、12个月的紫外光老化。对老化的试件在恒定荷载0.1 MPa的作用下,保持恒定温度20℃进行单轴压缩蠕变试验,得到应变-时间关系曲线。采用Burgers模型描述沥青砂的流变性能,并根据应变-时间关系进行Burgers模型4参数的拟合,拟合得到不同老化时间对应的黏弹性参数值,对该值进行拟合,得到黏弹性参数和老化程度的关系式E1(h)、E2(h)、η1(h)、η2(h),把该表达式代入Burgers模型的本构方程表达的蠕变柔量方程中得到蠕变柔量J(t)和老化时间的关系式J(h,t),提出用J(h,1 200 s)作为沥青混合料紫外光老化的评价指标。
[Abstract]:In order to put forward the evaluation index of ultraviolet aging of asphalt mixture, the rheological properties of asphalt mixture were studied by asphalt sand. The accelerated ultraviolet aging test of asphalt mixture was carried out for 0, 2, 4, 6, 8 and 12 months respectively. The strain-time relationship curve was obtained by uniaxial compression creep test at constant temperature of 20 鈩，
本文编号：2455159
[Abstract]:In order to put forward the evaluation index of ultraviolet aging of asphalt mixture, the rheological properties of asphalt mixture were studied by asphalt sand. The accelerated ultraviolet aging test of asphalt mixture was carried out for 0, 2, 4, 6, 8 and 12 months respectively. The strain-time relationship curve was obtained by uniaxial compression creep test at constant temperature of 20 鈩，
本文编号：2455159
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