水泥磷石膏稳定材料用于路面基层的探究

A Study on The Application of Cement Phosphogypsum Stabilized Material in Pavement Base

研究磷石膏的物理力学性质,分析磷石膏作为工程材料的可行性,采用不同掺量的固体固化剂和液体固化剂（掺量0.5%）改良水泥磷石膏稳定材料,进行素水泥磷石膏材料以及各种改良材料的水稳定性和7d、28d无侧限抗压强度试验,研究水泥磷石膏材料的水稳性能和力学性能,分析强度形成机理,对其作为路面基层材料的可行性进行评价。结果表明：磷石膏的物理力学性质类似于土,改性或改良后的磷石膏是一种良好的工程材料;水泥磷石膏稳定材料具有较好的水稳定性,固剂和液剂均明显提高水泥磷石膏稳定材料的无侧限抗压强度,且固剂掺量为1%时改良效果最佳;素水泥磷石膏稳定材料和两种改良水泥磷石膏稳定材料可满足不同等级和不同交通类型的路面基层材料的强度要求。

The physical and mechanical properties of phosphogypsum are studied, and the feasibility of phosphogypsum as engineering material is analyzed. The cement phosphogypsum stabilized material is modified by different dosage of solid curing agent and liquid curing agent （0. 5%）. In order to study the water stability and mechanical properties of cement phosphogypsum materials, analyze strength formation mechanism and its feasibility for pavement material, the water stability and the unconfined compressive strength test of 7d and 28d are carried out on plain cement phosphogypsum and various kinds of modified materials. The results show that the physical and mechanical properties of phosphogypsum are similar to that of soil, and the modified phosphogypsum is a good engineering material~ the cement phosphogypsum stabilized material has good water stability, and both solid curing agent and liquid curing agent can improve the unconfined compressive strength of them. When the dosage of solid curing agent is 1 %, the effect is the best; plain cement phosphogypsum stabilized material and two kinds of modified cement phosphogypsum stabilized material can meet the requirements of different grades and different types of road base materials.