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由于水泥稳定基层材料产生收缩裂缝难以避免,在荷载作用下,容易反射到路面形成反射裂缝,采用半刚性基层预裂缝技术对其进行处理,可以大大减少收缩裂缝的数量和严重程度(宽度和长度)。其施工工艺简便,就是在水泥稳定基层材料正常摊铺压实后1～3d内,采用钢轮振动压路机开到最大振幅进行稳步碾压。由于水泥稳定材料的自愈能力,振动碾压造成的强度暂时损失会随着时间逐渐恢复,因此预裂缝技术不会对基层结构产生破坏,也不会造成基层强度的降低。室内进行振动压实模拟,并采用无侧限抗压强度试验和收缩试验对碾压时机进行预判,现场碾压遍数和碾压时机采用土壤刚度仪进行控制。实践表明,预裂缝技术是一种有效而且廉价的减少收缩裂缝的施工措施。
As the shrinkage cracks in the stable base material of the cement are unavoidable, they are easily reflected to the road surface to form reflective cracks under the load. The semi-rigid base pre-cracking technology can greatly reduce the number and severity of shrinkage cracks (width and length ). The construction process is simple, that is, the stability of the basic material in the cement pavement after compaction 1 ~ 3d, the use of drum vibratory roller drive to the maximum amplitude of steady rolling. Due to the self-healing ability of the cement stabilized material, the temporary loss of strength caused by vibratory rolling will gradually recover over time, so the pre-fracture technology will not cause any damage to the grassroots structure and will not reduce the grassroots strength. Indoor vibration compaction simulation and unconfined compressive strength test and shrinkage test for rolling timing to predict the number of rolling sites and rolling time control by soil stiffness meter. Practice shows that pre-fracture technology is an effective and inexpensive construction measures to reduce shrinkage cracks.