【作者】 刘小滔；

【导师】 王旭东；

【作者基本信息】 重庆交通大学 ， 道路与铁道工程， 2011， 硕士

【摘要】 反射裂缝一直以来是水泥混凝土路面加铺沥青面层的主要病害,如何防治反射裂缝,更是困扰道路工程工作者的一个难题。针对该类病害,道路工程研究者投入大量精力在其研究工作上,其主要集中在以下几个方面:(1)水泥混凝土沥青加铺层反射裂缝产生机理及力学分析研究;(2)水泥混凝土沥青加铺层防治反射裂缝措施研究;(3)防治反射裂缝新材料新技术的研究。无论开展哪一方面的研究,最终目的都是解决水泥混凝土沥青加铺层反射裂缝,并延长加铺层使用寿命。在众多的防治反射裂缝措施中,采用沥青混合料作为应力吸收层是目前是水泥混凝土路面加铺沥青面层防治反射裂缝的主要措施。既然采用沥青混合料作为应力吸收层,必然将涉及到应力吸收层沥青混合料配合比设计。根据应力吸收层沥青混合料的功能特点,显然传统的以高温为主的普通沥青混合料配合比设计方法已经不适应应力吸收层沥青混合料。因此,亟需一种适用于应力吸收层沥青混合料的新设计方法。众所周知,沥青混合料配合比设计主要包括级配设计及油石比确定。因此,本文围绕混合料配合比设计,主要进行了如下三方面工作。首先,探讨具备何种结构特点的级配更适应于应力吸收层沥青混合料。考虑目前应用于应力吸收层沥青混合料的级配特点,设计出七种级配(其中,AC5三种级配,AC10四种级配),且该七种级配所确定的级配范围将目前应用与应力吸收层沥青混合料的级配类型均包括在内。通过室内试验,分别对试验级配混合料进行体积参数验证、高温稳定性验证、抗裂性能(低温抗裂和抗反射裂缝能力)验证以及施工和易性验证。综合各性能参数,最终,确定适用于应力吸收层沥青混合料的级配。其次,综合考虑应力吸收层沥青混合料高温稳定性、抗弯拉性能以及施工和易性,提出一种适用于应力吸收层沥青混合料的油石比设计方法。即,采用最佳紧密状态油石比为下限,谢伦堡析漏试验析漏损失率拐点油石比为上限,并根据路用性能最优确定应力吸收层最佳油石比。最后,根据本文应力吸收层所提出的配合比设计方法,通过实体工程验证,并取得良好的使用效果。更多还原

【Abstract】 Crack reflection has been main diseases of the cement concrete pavement overlaid Asphalt Surface. How to prevent Crack Rflection, is a difficult problem ,and it troubled road engineering workers. Based on the class of disease, Road Engineering Researchers have invested considerable effort to research work on it,it mainly focused the following several aspects:(1) the research on the mechanism of Produce mechanism and mechanics analysis on Crack Rflection;(2) the research on measures of preventing crack reflection;(3) the research on the new material and new technique of preventing crack reflection. No matter what kinds of research, the final purpose is solving problems about Crack Rflection and prolonging the service life of asphalt overlay. Among the numerous measures about preventing Crack Rflection,Using asphalt mixture as stress absorbing layer is the main measure of preventing Crack Rflection about the cement concrete pavement overlaid Asphalt Surface. Now that using asphalt mixture as stress absorbing layer,it should be involved in the design of mix proportion about asphalt mixture used as stress absorbing layer. According to function characteristics of stress absorbing layer, The traditional design procedures which dominated by high-temperature stability obviously don’t suit this asphalt mixture. Therefore it urgently need new the new design of mix proportion which suit asphalt mixture used as stress absorbing layer.As we all know, the design of mix proportion about asphalt mixture mainly includes gradation design and asphalt-aggregate ratio design. Therefore this paper focus on mix proportion and proceed two aspects of the work as follows:First, this paper discuss what structure characteristics of gradation is more suitable for asphalt mixture as stress absorbing layer. Considering the structure characteristics of gradation used as stress absorbing layer at present,this paper design seven gradation (including three AC5 gradation and four AC10 gradation).The gradation range determined by seven gradation includes the gradation range which used to asphalt mixture as stress absorbing layer. According to laboratory test. This paper respectively adopts volumetric parameter、high-temperature stability、crack resistance performance(Low Temperature crack and reflection crack)、workable performance to verify the performance of asphalt mixture. Comprehensively considered each performance parameters. Finally, this paper select the gradation which is suitable for asphalt mixture used as stress absorbing layer.Then, Comprehensively considered volumetric parameter、high-temperature stability、crack resistance performance、workable performance, this paper Proposes the method of the design based on equilibrium of pavement performance stress absorbing layer. This method adopts the asphalt-aggregate ratio of closest compact condition as Lower Limit, adopts the asphalt-aggregate ratio of loss rate of Schellenberg Binder Drainage Test as Upper Limit, and finally determine the optimum asphalt-aggregate ratio by the optimum pavement performance.Finally,according to the method of mix proportion proposed by this paper,and through the verification of the entity engineering,it achieved good use effect.更多还原