浅谈无机结合料基层裂缝的防治

Discussion on the prevention and control of crack of inorganic binder base course

基层是设置在面层之下,并与面层一起将车轮荷载的反复作用传止底基层、垫层、土路基,为主要承重作用的结构层,当前我国路面基层设计大都采用半刚性无机结合料,无机结合料的主要材料是水泥、石灰和粉煤灰。作为主要承重层的基层来说,对材料的强度和刚度指标有较高要求,它应该具有较好的强度和刚度,为我国目前使用最广泛的路面基层类型。但无机结合稳定材料基层存在着一个较大缺点,因其本身容易产生收缩裂缝,故使路面形成反射裂缝。本文通过分析各种无机结合料稳定材料收缩裂缝的规律及成因和现场实践,总结无机结合料稳定材料收缩裂缝的预防和治理措施。

The base is the main supporting course,set under the surface course and deliver the repeated action of traffic to subbase,cushion and soil subgrade together with surface course.At present,the designs of base course mainly adopt semi-rigid inorganic binder materials.Cement,lime and fly ash are the predominant material of inorganic binder.The base as a main supporting course has high requirements to the strength and stiffness of material.Inorganic binder stabilized base has often been called semi-rigid inorganic binder base and has well strength and rigidity,is the most widely used base types in my country.But there is a great disadvantage in inorganic binder base course.Because this base itself can produce shrinkage cracks easily and will lead pavement to form reflection cracks.This paper based on the field practice and the analysis of regularity and cause of shrinkage crack,to summarize its preventative and administrative measures.