水泥掺量对乳化沥青冷再生水泥稳定材料性能的影响

Effects of Cement Addition on Performances of Emulsified Asphalt Cold Recycled Cement Stabilized Material

为实现废旧水泥稳定基层材料的高效再生利用,在确定乳化沥青冷再生水泥稳定材料最佳配合比的基础上,研究了不同水泥掺量对乳化沥青冷再生水泥稳定材料力学及路用性能的影响规律,从而比选确定最佳水泥掺量,最后利用扫描电子显微镜观察了乳化沥青冷再生水泥稳定材料的微观形貌,对其强度形成机理进行了分析。结果表明:最佳水泥掺量为1.5%,对应的最佳乳化沥青掺量为4.5%,最佳含水率为5.69%,此时劈裂强度为0.6 MPa,抗压强度为3.58 MPa,抗压回弹模量约为1032 MPa,劈裂强度为0.51 MPa。在添加水泥以后,水泥的水化产物与乳化沥青结合形成网状结构加强了集料之间的粘结强度,进一步提升了冷再生混合料的抗压强度、劈裂强度和高、低温性能。

In order to realize the efficient recycling of old cement stable base material,the optimum mix ratio of emulsified asphalt cold recycled cement stabilized material by experiments.The effects of different cement content on the mechanics and engineering performance of emulsified asphalt cold recycled cement stabilized material were studied.The optimum cement content was determined by performance tests.Finally,the microscopic morphology of the emulsified asphalt cold recycled cement stabilized material was observed by scanning electron microscope,and the strength formation mechanism was analyzed.The results show that the best cement content is 1.5%,the corresponding best emulsified asphalt content is 4.5%,and the best moisture content is 5.69%.At this time,the splitting strength is 0.6 MPa and the compressive strength is 3.58 MPa.The compressive resilience modulus is about 1032 MPa,and the splitting strength is 0.51 MPa.After adding cement,the hydration products of the cement combine with the emulsified asphalt to form a network structure to strengthen the bonding strength between the aggregates.The compressive strength,splitting strength,high and low temperature performance of the cold recycled mixture were enhanced further.