沥青混合料粘弹性参数模型与低温评价指标

发布时间：2018-09-13 12:25

【摘要】：沥青混合料是一种柔性路面材料,目前已广泛应用于高等级公路和城市道路建设中,由于沥青路而受温度和荷载作用影响较大,在两者共同作用下会产生裂缝,缩短了道路的使用寿命。如何预防路面开裂是道路工程界一直研究的课题。本文针对沥青混合料低温开裂性能展开了研究,研究的主要内容如下：前三章基于沥青路面低温开裂机理的分析,介绍了国内外常用的几种沥青低温性能评价指标,以及评价沥青混合料低温抗裂性的试验方法,详细描述了沥青混合料的粘弹性特征从而选择出合适的试验方案。第四章应用Burgers模型作为本构模型来表征沥青混合料的应力松弛特性,基于非线性最小二乘法原理拟合出各种试验温度下的试验数据,根据获得的Burgers模型粘弹性参数来分析温度变化对粘弹性参数的影响,建立了与温度有关的粘弹性参数模型。根据建立得粘弹性参数模型能预测出某一温度下沥青混合料试件内部的应力,从而为预估沥青路面低温开裂提供了依据。为了获得合理的沥青结合料低温性能的测试方法和评价指标,第五章应用灰色关联度分析原理,计算了目前常用的儿种能反映沥青混合料低温性能的评价指标与约束试件温度应力试验测定得冻断温度之间的关联度,对各项指标与冻断温度的灰关联度进行了排序分析,为确定合理的低温评价指标给出了参考意见。
[Abstract]:Asphalt mixture is a kind of flexible pavement material, which has been widely used in the construction of high-grade highway and urban road. The service life of the road is shortened. How to prevent pavement cracking is a research topic in road engineering field. In this paper, the low temperature cracking performance of asphalt mixture is studied. The main contents are as follows: the first three chapters, based on the analysis of the mechanism of low temperature cracking of asphalt pavement, introduce several kinds of asphalt low temperature performance evaluation indexes commonly used at home and abroad. The test method for evaluating the low temperature crack resistance of asphalt mixture is presented. The viscoelastic characteristics of asphalt mixture are described in detail and the suitable test scheme is selected. In chapter 4, the Burgers model is used as the constitutive model to characterize the stress relaxation characteristics of asphalt mixture. Based on the principle of nonlinear least square method, the experimental data at various test temperatures are obtained. According to the viscoelastic parameters obtained from the Burgers model, the influence of temperature change on the viscoelastic parameters is analyzed, and the temperature dependent viscoelastic parameter model is established. According to the established viscoelastic parameter model, the stress inside the asphalt mixture specimen can be predicted at a certain temperature, which provides a basis for predicting the low temperature cracking of asphalt pavement. In order to obtain a reasonable test method and evaluation index of bituminous binder's low temperature performance, the fifth chapter applies the principle of grey relational degree analysis. This paper calculates the correlation degree between the evaluation index which can reflect the low temperature performance of asphalt mixture commonly used at present and the temperature stress test of restrained specimen, and analyzes the grey correlation degree between each index and freezing temperature. Some suggestions are given for determining reasonable evaluation index of low temperature.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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