生活废旧塑料CRP改性浇注式沥青混凝土性能研究

发布时间：2018-11-09 15:13

【摘要】：使用在钢桥面铺装层上的发明和发展于国外的浇注式沥青混凝土,在路用性能方面,具有整体性好、防水性能优良;优良的抗高温性能、抗老化性能、抗疲劳性能、低温抗裂性;对钢桥面板的良好的追从性以及期望使用寿命长等特点。自从国外引进后被广泛应用在我国大跨径钢箱梁桥的桥面铺装中。但考虑到我国地理环境气候比较复杂,许多按照欧洲标准设计的浇注式沥青混凝土铺装层在我国的应用中都不同程度的出现了病害,最严重的问题就是铺装表面高温稳定性严重不足,究其原因就是我国的大部分地区夏季的温度普遍偏高。尤其是长江流域一带,铺装层表面的温度能达到70℃左右,这比国外规范中规定的实验温度(40℃)高的多,此时应用于我国的浇注式沥青混凝土决不能再照搬国外规范来设计,必须结合我国的实际情况加以改进,研制出符合我国气候特征的浇注式沥青混凝土。根据我国的气候特点,将以往使用单一改性剂的改性浇注式沥青向使用聚合物复合改性沥青的浇注式沥青混凝土方案对现在的提高钢桥面的高稳定性有着巨大的应用前途。本文采用常规试验方法对不同掺量的CRP改性浇注式沥青、不同掺量的SBS改性浇注式沥青以及CRP复合改性浇注式沥青的性能进行对比试验研究及分析,研究了CRP改性沥青的高温、低温性能,对比了CRP改性、SBS改性、CRP复合改性沥青粘滞性能;通过针对不同类型的改性浇注式沥青混凝土的流动度、贯入度、贯入度增量等实验确定了不同改性沥青配合方案的油石比;通过不同改性沥青配合方案各自油石比下制得的混合料60℃车辙、70℃车辙、低温弯曲、粘附性、水稳定性、冻融劈裂等试验研究了CRP复合改性浇注式沥青混合料的综合路用性能;首次提出用“高温性能降低率”来表征CRP复合改性浇注式沥青混凝土的高温性能。结果表明:(1)CRP复合改性浇注式沥青混凝土的高温抗车辙性能显著,较SBS单一改性和CRP单一改性浇注式沥青混凝土的车辙提高很多;(2)CRP复合改性浇注式沥青混凝土的低温性能介于CRP单一改性和SBS单一改性浇注式沥青混凝土之间;(3)CRP复合改性浇注式沥青混凝土的抗水损害能力得到了明显提高。得出了CRP改性浇注式沥青混凝土钢桥桥面铺装的配合比配合比:5%CRP+70#基质沥青+33.3%湖沥青+5%岩沥青+4%SBS。
[Abstract]:The invention of steel bridge deck pavement and the pouring asphalt concrete developed in foreign countries have good integrity and good waterproof performance in road performance. Excellent high temperature resistance, aging resistance, fatigue resistance, low temperature crack resistance, good recovery of steel bridge panels and long expected service life. It has been widely used in the deck pavement of long-span steel box girder bridges in China since it was introduced from abroad. However, considering the complexity of the geographical environment and climate in China, many pouring asphalt concrete pavement designed according to European standards have been damaged to varying degrees in their application in China. The most serious problem is the serious shortage of high temperature stability of pavement surface, which is due to the high temperature in most areas of our country in summer. Especially in the Yangtze River Basin, the surface temperature of the pavement can reach about 70 鈩，

本文编号：2320776