水泥改良海南滨海砂路用性能研究

通过XRD射线衍射、筛分试验对海南东南部滨海砂的基本物理性质进行了研究，并对水泥改良砂开展了击实、压缩、承载比、无侧限、微观试验，论证了水泥改良方案的可行性。结果表明:海南砂，素砂和水泥改良砂最优含水率为11.5%~13.1%，最大干密度则随着水泥掺量的增加而增加。水泥掺量为2%，6%，10%的改良砂养护1个月后压缩模量、承载比均满足相关规范要求。水泥掺量10%的改良砂养护1周及水泥掺量6%的改良砂养护2周的强度能够满足二级及以下等级公路底基层填料的要求，用作路基填料时，建议水泥掺量在6%以上。

Study on Road Performance of Cement Modified Coastal Sand in Hainan

The basic physical properties of coastal sand in southeastern Hainan Province were studied by XRD and sieving test. The result shows that the feasibility of cement improvement program was demonstrated through compaction test, compression test, bearing ratio, unconfined compression and microscopic test. The conclusions are as follows:the main component of the sand is silica, such sand is a kind of bad grading sand, the optimum water content of the sand and cement modified sand is between 11.5% and 13.1%, and the maximum dry density increases with an increase of cement content; the compressive modulus with 2 percent, 6 percent and 10 percent cement content, the California bearing ratio meet the requirements of related specification a month. The after strength of modified sand with 10 percent cement cured for one week and 6 percent cement cured for two weeks can meet the requirements of base packing materials of second and below class road the proposed cement content is above 6 percent when cement modified sand is used as roadbed filler.