中文摘要：

为减小半刚性基层材料收缩变形量,增强其抗裂能力,本课题组通过化工废料火山灰反应产物开发低成本的微膨胀道路基层抗裂缝剂,将其添加于道路基层混合料中。通过对半刚性基层材料掺加抗裂缝剂的试验研究,分析了抗裂缝剂对半刚性基层材料的水泥净浆凝结时间、基本力学性能和材料收缩性能的影响;并借助SEM测试手段,从微观上对水泥体系中钙矾石的生成进行了分析。结果表明,半刚性基层抗裂缝剂具有很好的微膨胀性和增密性,使道路基层结构因温度和湿度的变化引起材料收缩的空间大大减少,源头上解决路面裂缝难题,延长道路使用寿命。

英文摘要：

In order to reduce shrinkage deformation and enhancet he crack resistance of the semi-rigid base materials,a low-cost and micro-ex pansion anti-cracking agent is developed from pozzolanic reaction waste to redu ce the cracks in the road or pavement.The influence of anti-cracking agent on setting time of cement paste,basic mechanical property and shrinkage property i s analyzed,and by the scanning electronic microscope（SEM） testing approach,th e generation of ettringite from cement system is investigated from the perspective of microscopic.The test results indicate that the semi-rigid base added ant i-cracking agent has a good micro-expansion and densification,which makes the shrinkage space caused by the temperature and humidity change significantly red uced,improves the pavement performance of semi-rigid base and prolongs the roa dway service life.