基于压力胶片技术的沥青混合料抗滑耐久性评价

发布时间：2018-01-28 01:35

本文关键词： 道路工程沥青路面压力胶片技术应力集中分布率抗滑性能衰减率　出处：《中国公路学报》2017年09期 　论文类型：期刊论文

【摘要】：为评价沥青混合料的抗滑耐久性,自主研发了加速加载搓揉试验机,采用压力胶片测量技术,对经过0,2,4,6,8h搓揉试验的不同类型沥青路面车辙板进行静载压力胶片试验,尝试采用压力胶片测量技术结合数据分析提出新的指标来评价沥青混合料的抗滑耐久性。采用0.2~0.6 MPa胶片和0.5~2.5 MPa胶片分别研究不同搓揉时间后的车辙板与轮胎静态接触的有效面积和应力集中效应,并通过压力胶片数据采集分析软件重构应力集中三维效果图。研究结果表明:不同搓揉时间下轮胎与路面接触的有效面积不同,搓揉时间越长接触面积越大,在0~8h搓揉过程中有明显递增趋势;不同搓揉时间下轮胎与路面接触的应力集中效应不同,在0~8h搓揉过程中应力集中效应有明显递减趋势;压力胶片测量技术能够很好地反映轮胎与路面间的真实接触状态和路面应力集中的衰减过程;相同原材料下,GAC-13级配的沥青路面抗滑性能及耐久性均优于AC-13;提出采用应力集中分布率和抗滑性能衰减率表征沥青混合料的抗滑耐久性,这2个指标与构造深度及摆值相关性良好,评价沥青混合料的抗滑耐久性具有足够的准确性及可靠度,为后续采用该指标设计优良抗滑性能的沥青混合料提供借鉴。
[Abstract]:In order to evaluate the anti-slip durability of asphalt mixture, an accelerated loading kneading test machine was developed. The static pressure film test of different kinds of asphalt pavement rutting board was carried out in 8 h rub test. This paper attempts to use pressure film measurement technique and data analysis to put forward new indexes to evaluate the anti-slip durability of asphalt mixture. Using 0.20.6 MPa film and 0.5g 2.5. MPa film was used to study the effective area and stress concentration effect of static contact between rutting plate and tire after different kneading time. The results show that the effective area of contact between tire and road is different under different kneading time, the longer the contact time is, the larger the contact area is. There is an obvious increasing trend in the process of 0h kneading. Under different kneading time, the stress concentration effect of contact between tire and pavement is different, and the stress concentration effect decreases obviously in 0h kneading process. The pressure film measurement technology can well reflect the true contact state between the tire and the road surface and the attenuation process of the stress concentration on the road surface. The asphalt pavement with GAC-13 grade is superior to AC-13 in skid resistance and durability under the same raw material. Stress concentration distribution rate and anti-slip performance attenuation rate are used to characterize the anti-slip durability of asphalt mixture. These two indexes have good correlation with structural depth and pendulum value. The evaluation of the anti-slip durability of asphalt mixture has enough accuracy and reliability, which provides a reference for the subsequent design of asphalt mixture with excellent anti-slide performance.
【作者单位】：华南理工大学土木与交通学院;广东省建筑科学研究院集团股份有限公司;
【基金】：国家自然科学基金项目(51378223) 广东省交通运输厅科技项目(2014-02-003)
【分类号】：U414
【正文快照】： 0引言中国绝大部分高速公路都是采用沥青路面,其抗滑性能直接关系到道路行车的安全。沥青路面抗滑耐久性问题突出,尤其表现为抗滑性能衰减太快,新建路面在开放交通2年后其路面平均构造深度由1.0mm很快衰减到0.6mm附近,其横向力系数从60~70快速衰减为40~50,这些都不符合干线交

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