基于裂缝扩展性能的沥青混合料低温性能试验方法的比选与优化

发布时间：2018-01-16 17:10

本文关键词：基于裂缝扩展性能的沥青混合料低温性能试验方法的比选与优化　出处：《武汉工程大学》2014年硕士论文　论文类型：学位论文

【摘要】：20世纪50年代以来，世界范围内所修建的沥青路面所占比重越来越大。最近20来年，我国修筑的沥青路面越来越多，并广泛用于公路和城市道路的建设。由于沥青路面直接或间接受行车荷载与自然条件影响，路面低温裂缝成为了一种普遍破坏形式。反射裂缝作为我国半刚性基层的主要病害之一，其开裂机理与荷载、温度、湿度、路面结构及结构组合以及材料特性等多因素相关。然而，出现反射裂缝，或者说反射裂缝发生并不可怕，只要反射裂缝不扩展到顶部，雨水不进入道路内部，损坏就不会加剧。因此，如何采用一种较好的试验方法，来评价沥青混合料的抗反射裂缝性能，进而指导路面结构设计与材料设计，对于提高沥青路面抗裂性能意义重大。目前，评价沥青混合料低温性能的试验方法有很多，包括低温弯曲蠕变试验；间接拉伸试验（即劈裂试验IDT）；直接拉伸试验；半圆弯曲试验（SCB）；应力松弛试验； Overlay Tester等。由于加载方式、试件形状与尺寸、约束条件、试验条件等不一样，每个试验所反映或模拟的力学特性或变形特性就不一样。对于沥青混合料低温性能的评价，国内外还没有一个统一的，或者说公认的方法，来合理的作出评判。本文首先对现有的国内外沥青混合料低温性能检测方法进行比较与分析；其次通过数值有限元分析软件建模，，计算分析实际沥青路面反射裂缝产生与扩展的情况；然后对比推选出一个能较好的模拟实际路面反射裂缝行为的试验方法；最后对该试验方法进行试验设备可靠性验证。在对设备进行可靠性验证的同时，开展沥青混合料的抗反射裂缝性能的研究。通过一系列的对比研究，以及对推荐试验方法的试验验证，最终比选出一个试验结果稳定，重复性好，能很好地模拟反射裂缝扩展性能，而且试验耗时短，可操作性强的试验方法。
[Abstract]:Since the 1950 ' s , the proportion of asphalt pavement constructed in the world has been increasing more and more . In recent 20 years , China has built more and more asphalt pavement , and has been widely used in road and urban road construction . As a result of the direct or indirect acceptance of traffic load and natural conditions , the crack mechanism of pavement is not terrible . As long as the reflection crack does not spread to the top , the rain does not enter the interior of the road , and the damage is not increased . Therefore , it is important to use a better test method to evaluate the anti - reflection crack performance of asphalt mixture , and to guide the structural design and material design of asphalt pavement . At present , there are many test methods for evaluating the low temperature performance of asphalt mixture , including low temperature bending creep test , indirect tensile test ( i.e . , split test IDT ) , direct tensile test , semi - circular bending test ( scb ) , stress relaxation test , Overlay tester , etc . Because of the loading mode , the shape and size of the test piece , the constraint conditions and the test conditions are different . For the evaluation of the low temperature performance of the asphalt mixture , there is no uniform or accepted method at home and abroad , so as to make reasonable judgment . This paper compares and analyzes the existing low - temperature performance test method of asphalt mixture at home and abroad , secondly , through numerical finite element analysis software modeling , calculates and analyzes the actual asphalt pavement reflection crack generation and extension , and then compares the test method to the test equipment reliability verification . Through a series of comparative studies , and the test verification of the recommended test method , the test result is stable and the repeatability is good , the reflection crack propagation performance can be well simulated , and the test method has short time and strong operability .

【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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