路用半刚性基层材料抗裂缝剂应用研究

Application Research on Anti-cracking Agent for Semi-rigid Base

将研究出的半刚性基层抗裂缝剂添加于道路基层混合料中,通过扫描电子显微镜观测材料微结构形成过程,发现其具有膨胀性和增密性.收缩试验证明,该抗裂缝剂可使道路基层结构因温度和湿度变化所引起的收缩空间大大减少.试验还分析了延迟成型时间对碎石混合料强度的影响,发现抗裂缝剂具有缓凝性能.耐久性试验显示,掺加抗裂缝剂的半刚性基层混合料的早期强度得到了提高,养护周期缩短,耐久性也得到加强.试验路显示,利用半刚性基层材料抗裂缝剂的延时性可实施基层、面层连续施工,使基层、面层紧密结合,从而防止路面开裂,提高道路的耐久性,延长道路使用寿命.

Microstructure and formation process of the material mixed with anti-cracking agents were observed by the scanning electronic microscope.It is found that the anti-cracking agent has expansion character and can make the material dense.Through the shrinkage tests,it is proved that the shrink spaces of the road base,which is caused by the variations of the temperature and humidness,decrease apparently because of the anti-cracking agent.The influence of delaying the molding time on the strength of gravel mixtures is also analyzed and it is concluded that anti-cracking agent has slow setting performance.On account of adding anti-cracking agent into the semi-rigid base material,early strength of the material is enhanced, curing period is shorten and lasting quality is improved,which can be showed from the durability test.The continuous constructions of the base and asphalt pavement are feasible in the test road because of anticracking agent,which make the base and surface pavements compacted tightening.Thus,cracking of the pavements can be restrained,durability of the road can be improved and road life can be extended.