水性环氧树脂改性微表处抗水损害性能的试验研究

Experimental Research on the Water Damage Resistant Performance of Micro-surfacing with Water-borne Epoxy Resin

微表处在实际使用中水损害问题日益突出,主要表现为集料松散剥落或由于层间粘结力不足导致的整片剥落。为改善其抗水损害性能,通过湿轮磨耗试验,研究WER种类、WER添加方式,不同油石比、不同浸水条件和时长等因素对环氧微表处的抗水损害性能的影响。试验结果表明:环氧微表处较普通微表处抗水损害效果较好,长期浸水不易松散,且不会有易溶于水的物质析出;油石比为5%时,WER种类及其掺加方式对水损害改善效果明显,且WER固化成型的空间网络结构可以弥补油石比不足的缺点;干湿循环条件较饱和浸水条件缩短了混合料浸水时长,且60℃烘干加剧了WER的固化交联反应,使得该条件下环氧微表处磨耗值较低;W-1固化后形成的凝胶体平均粒度大,交联程度高,固化时间短,其微表处混合料抗水损害性能优于W-2;综合比较,饱水状态掺加方式W> A>S,而干湿循环掺加方式A>W>S,建议根据实际路面的不同浸水状态选择掺加方式A或W。

In the practical engineering,the water damage problem of micro-surfacing became gradually prominent,mainly for the loose aggregate peeling or whole film peeling because of insufficient adhesion between the layers.In order to improve this performance,this paper studied the effects of WER type,WER addition method,asphalt aggregate ratio and different immersion conditions on epoxy water damage resistance through wet wheel abrasion test.The results show that:compared with ordinary micro-surfacing,WER micro-surfacing has better water-resistance.After long-term immersion,it is not easy to loose,and there's no precipitation of water-soluble substances.When asphalt aggregate ratio(AAR)is 5%,the improvement of water-resisting property increased obviously by WER type and addition method,and space net structure of WER can make up for the shortage of low AAR.Compared with saturated immersion,dry-wet circulation shortened the immersion time of mixture,and drying at 60℃exacerbates the curing cross-linking reaction of WER,lower WER micro-surfacing WTAT in this condition.Curing W-1 formed larger gelatinous substance in average particle size,higher cross linking degree,shorter curing time.So its water-resisting property is better than W-2.In comprehensive comparison,in saturation immersion condition,the adding method is W >A >S,while in the dry-wet cycle condition,the adding method is A >W >S.It is suggested that method A or W should be choose base on actual flooded condition.