沥青路面预养护材料再生还原剂性能研究
发布时间：2019-06-03 08:50
【摘要】：沥青路面因其具有行车安全舒适、低噪声、无扬尘等优点而越来越受到人们的青睐,并成为我国公路路面的主要形式。但沥青路面在自然因素和车辆荷载综合作用下,易出现早期损坏致使路面的服务质量及使用年限不断恶化。因此,沥青路面在全寿命周期内选择适当的时机实施预防性养护对延长路面寿命显得非常重要。本文选择几种常用的预养护材料再生还原剂进行系统的研究和探索,希望对预养护技术的推广应用有所借鉴。本文通过室内试验研究再生还原剂对老化沥青的还原性,通过渗透深度和还原效果相结合的方法,确定再生还原剂在还原性试验中的掺量,即选择4.8%,6.0%,8.0%三种掺量加入到老化沥青中制备再生沥青。通过检测再生沥青的针入度、延度和软化点,研究还原剂对老化沥青的还原作用。试验结果表明掺加了再生还原剂材料后,再生沥青的针入度和延度与老化沥青的相比都有所增加,软化点都有所降低,说明再生还原剂对老化沥青的三大指标都有一定的还原功能,但还原效果存在差异。将五种再生还原剂材料涂刷在室内试验成型的试件上,研究再生还原剂对沥青混合料的高温稳定性和水稳定性的影响。结果说明,还原剂材料对沥青混合料的这两种性能有一定的影响:沥青混合料的高温稳定性都有所下降,其下降率一般在3.4%~23.3%范围内;但五种还原剂中有三种能够使沥青混合料水稳定性得到提高,一般提高了1.6%~6.4%,而另两种对改善沥青混合料的水稳定性作用不明显。采用比较试验将五种再生还原剂涂刷在彩色车辙板上来研究其渗透性,根据试验数据得出,五种材料中渗透性较好的其深度可达2.02 cm。通过检测涂刷前后现场切割的路面试件的渗水系数、构造深度、摩擦系数得到如下结论:涂刷材料后试件的渗水系降低了76.4%~91.4%,说明还原剂具有明显的防渗水性能;但试件的构造深度和摩擦系数都有所减小,说明涂刷还原剂后会降低路面的抗滑性。综上,采用再生还原剂对沥青路面实施预防性养护是益于路面使用性能的,但应注重提高沥青的软化点和还原路面的抗滑性能,以确保行车安全。
[Abstract]:Asphalt pavement is more and more favored by people because of its advantages of safe and comfortable driving, low noise, no dust and so on, and has become the main form of highway pavement in our country. However, under the combined action of natural factors and vehicle load, asphalt pavement is prone to early damage, resulting in the deterioration of pavement service quality and service life. Therefore, it is very important to select the appropriate time to carry out preventive maintenance in the whole life cycle of asphalt pavement. In this paper, several commonly used recycled reductants of pre-curing materials are selected for systematic research and exploration, hoping to draw lessons from the popularization and application of pre-curing technology. In this paper, the reducibility of recycled reductant to aged asphalt was studied by laboratory test. By combining penetration depth and reduction effect, the content of recycled reductant in reducibility test was determined, that is, 4.8% and 6.0%, respectively. The recycled asphalt was prepared by adding 8.0% three kinds of content to the aging asphalt. The reduction effect of reductant on aged asphalt was studied by detecting the penetration, extensibility and softening point of recycled asphalt. The test results show that the penetration and ductility of recycled asphalt are increased and the softening point is lower than that of aged asphalt when the recycled reductant material is added. The results show that the recycled reductant has certain reduction function to the three indexes of aging asphalt, but the reduction effect is different. Five kinds of recycled reductants were brushed on the specimens formed by laboratory test, and the effect of recycled reductants on the high temperature stability and water stability of asphalt mixture was studied. The results show that the reductant material has a certain influence on the two properties of asphalt mixture: the high temperature stability of asphalt mixture decreases, and the reduction rate is generally in the range of 3.4% 鈮，
本文编号：2491815
[Abstract]:Asphalt pavement is more and more favored by people because of its advantages of safe and comfortable driving, low noise, no dust and so on, and has become the main form of highway pavement in our country. However, under the combined action of natural factors and vehicle load, asphalt pavement is prone to early damage, resulting in the deterioration of pavement service quality and service life. Therefore, it is very important to select the appropriate time to carry out preventive maintenance in the whole life cycle of asphalt pavement. In this paper, several commonly used recycled reductants of pre-curing materials are selected for systematic research and exploration, hoping to draw lessons from the popularization and application of pre-curing technology. In this paper, the reducibility of recycled reductant to aged asphalt was studied by laboratory test. By combining penetration depth and reduction effect, the content of recycled reductant in reducibility test was determined, that is, 4.8% and 6.0%, respectively. The recycled asphalt was prepared by adding 8.0% three kinds of content to the aging asphalt. The reduction effect of reductant on aged asphalt was studied by detecting the penetration, extensibility and softening point of recycled asphalt. The test results show that the penetration and ductility of recycled asphalt are increased and the softening point is lower than that of aged asphalt when the recycled reductant material is added. The results show that the recycled reductant has certain reduction function to the three indexes of aging asphalt, but the reduction effect is different. Five kinds of recycled reductants were brushed on the specimens formed by laboratory test, and the effect of recycled reductants on the high temperature stability and water stability of asphalt mixture was studied. The results show that the reductant material has a certain influence on the two properties of asphalt mixture: the high temperature stability of asphalt mixture decreases, and the reduction rate is generally in the range of 3.4% 鈮，
本文编号：2491815
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