集料类型对橡胶沥青混合料低温性能的影响研究
发布时间：2018-10-17 10:31
【摘要】：迄今为止建设的高等级公路绝大部分采用的是沥青路面。但是我国高速公路事业的发展和自然资源的有限性使得大量的优质集料已经达到了供不应求的现状,给集料的开采和供应带来极大的压力。因此开展对不同集料的适用性研究,成为公路建设发展的迫切需求。另外,低温开裂是沥青路面的主要病害之一,它往往是其他病害的开端。裂缝的存在及其导致的其他病害严重影响了路面的路用性能。所以关于沥青混合料的低温抗裂性一直是国内外道路工程学者研究的重点内容。鉴于此,本文针对由三种集料:玄武岩、凝灰岩、花岗岩及三种级配:SMA-13、AC-13、Type B组合而成的橡胶沥青混合料进行低温性能的研究分析。首先,通过一系列相关的室内试验进行橡胶沥青、各种集料、添加剂等原材的性能指标测定,确定原材的各种指标满足规范要求;其次,对由三种集料三种级配对应的九组橡胶沥青混合料进行马歇尔配合比设计,确定混合料的最佳油石比;再次,根据确定的最佳油石比成型两种低温试验所需要的试件:劈裂试件及小梁试件(二次成型);并对试件完成不同温度(10℃,0℃,-10℃,-20℃)的低温劈裂试验及低温弯曲试验研究。最后,对低温试验得出大量试验数据进行汇总分析,并运用数理统计知识二元方差分析进行验证;同时采用变异系数进行两种低温试验数据的离散性分析。研究表明:低温弯曲试验的数据变异系数比低温劈裂试验的大,数据离散性大。所以,劈裂试验数据的结果及结论就本课题而言更具有参考价值。另外就劈裂试验而言,-20℃应变变异系数也较大,所以-20℃试验结果仅做参考。经劈裂试验数据结果分析,对于不同集料不同级配组成的橡胶沥青混合料低温性能排序:凝灰岩花岗岩玄武岩。通过本次研究,我们可以对不同集料类型不同级配的橡胶沥青混合料在不同温度下的低温性能有一定的了解,也为不同地区能够合理运用多种集料,减少集料供不应求的现状提供相应的技术建议。
[Abstract]:So far, most of the high-grade highways built are asphalt pavement. However, with the development of highway industry and the limitation of natural resources, a large number of high-quality aggregates have reached the situation of shortage of supply, which brings great pressure to the exploitation and supply of aggregates. Therefore, the research on the applicability of different aggregates becomes the urgent need of highway construction and development. In addition, low temperature cracking is one of the main diseases of asphalt pavement, it is often the beginning of other diseases. The existence of cracks and other diseases have seriously affected the pavement performance. Therefore, the low-temperature crack resistance of asphalt mixture has been the focus of road engineering scholars at home and abroad. In view of this, the low temperature performance of rubber asphalt mixture composed of three kinds of aggregates: basalt, tuff, granite and three gradation: SMA-13,AC-13,Type B is studied and analyzed in this paper. First of all, through a series of related laboratory tests to determine the performance indexes of rubber asphalt, aggregate, additives and other raw materials, to determine that the raw materials meet the requirements of the specifications. Nine groups of rubber asphalt mixture corresponding to three kinds of aggregates and three grades are designed by Marshall mix ratio to determine the best petrol-stone ratio of the mixture. According to the optimum ratio of stone to stone, the split specimen and the trabecular specimen (secondary forming) were used to form two kinds of low temperature test specimens, and the low temperature splitting test and the low temperature bending test were carried out at different temperatures (10 鈩，
本文编号：2276373
[Abstract]:So far, most of the high-grade highways built are asphalt pavement. However, with the development of highway industry and the limitation of natural resources, a large number of high-quality aggregates have reached the situation of shortage of supply, which brings great pressure to the exploitation and supply of aggregates. Therefore, the research on the applicability of different aggregates becomes the urgent need of highway construction and development. In addition, low temperature cracking is one of the main diseases of asphalt pavement, it is often the beginning of other diseases. The existence of cracks and other diseases have seriously affected the pavement performance. Therefore, the low-temperature crack resistance of asphalt mixture has been the focus of road engineering scholars at home and abroad. In view of this, the low temperature performance of rubber asphalt mixture composed of three kinds of aggregates: basalt, tuff, granite and three gradation: SMA-13,AC-13,Type B is studied and analyzed in this paper. First of all, through a series of related laboratory tests to determine the performance indexes of rubber asphalt, aggregate, additives and other raw materials, to determine that the raw materials meet the requirements of the specifications. Nine groups of rubber asphalt mixture corresponding to three kinds of aggregates and three grades are designed by Marshall mix ratio to determine the best petrol-stone ratio of the mixture. According to the optimum ratio of stone to stone, the split specimen and the trabecular specimen (secondary forming) were used to form two kinds of low temperature test specimens, and the low temperature splitting test and the low temperature bending test were carried out at different temperatures (10 鈩，
本文编号：2276373
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