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基层半刚性材料以水泥稳定级配集料和石灰粉煤灰稳定级配集料两种类型为主,这两类半刚性材料所固有的温缩和干缩特性,易使半刚性基层产生收缩裂缝,并导致沥青面层反射裂缝或对应裂缝的产生。目前国内外对这一技术难题尚未找到较好的解决办法。在我国主要从两方面加以减轻或延缓,一是调整集料配合比,减少半刚性材料的收缩系数,二是增加沥青面层的厚度,以延缓半刚性基层收缩裂缝对沥青面层的反射。此外,国外还采用设置隔离裂缝中
The semi-rigid base material is mainly composed of two types of aggregate with stable aggregate of cement and lime and fly ash, the inherent shrinkage and shrinkage characteristics of these two types of semi-rigid materials tend to cause shrinkage of semi-rigid base Cracks, and lead to reflective reflection of asphalt surface cracks or the corresponding cracks. Currently at home and abroad have not found a better solution to this technical problem. In our country, it is mainly mitigated or delayed from two aspects. One is to adjust the aggregate mix ratio and reduce the shrinkage factor of semi-rigid materials. The other is to increase the thickness of asphalt surface layer to delay the reflection of asphalt surface layer by shrinkage cracks of semi-rigid base layer. In addition, foreign countries also used to set the isolation cracks