减水剂对水泥稳定碎石物理力学性能的影响

通过室内试验，考察了减水剂对水泥稳定碎石基层物理力学性能，尤其是产生反射裂缝问题的收缩性能的影响．结果表明，减水剂能使水泥稳定碎石基层的最大干密度对用水量的敏感性降低且易于压实，有利于施工控制；在力学性能上，减水剂的加入提高了材料的抗拉强度，但抗压强度在低含水量区域不取决于水灰比，减水剂对抗压强度的影响无规律；适宜用量的减水剂降低了基层材料的收缩量．此外，粉煤灰和减水剂复掺可进一步改善水泥稳定碎石基层的性能．

Effect of Water Reducing Agent on the Physical and Mechanical Properties of Cement Stabilized Crushed Rock

By the laboratory study on the base of cement stabilized crushed rock adding water reducing agent, the physical and mechanical properties of the base were investigated. Because of the effect of reflective cracking, shrinkage was on the focus. It is showed that susceptibility of the maximum dry density to the water dosage on this base is reduced and the base can be compacted more easily. These characteristics are useful for the on site quality control. At the same time, the splitting tensile strength of the base is improved but the compressive strength fluctuates. The reason is, in the field of little water content, the compressive strength of concrete does not follow the water-cement ratio rule. The shrinkage of the base decreases by the proper dosage water reducing agent. Furthermore, it is also found that the performance of the base of cement stabilized crushed rock can be improved further by mixing water reducing agent and fly ash together.