水泥土劈裂抗拉强度试验研究

Experimental Study on Splitting Tensile Strength of Cement-soil

为了研究水泥土抗拉强度的增长特点,讨论影响水泥土抗拉强度的主要影响因素,试验采用劈裂试验分析不同水泥掺入比的水泥土在不同养护条件下的抗拉强度的变化情况,对比水泥土抗压性能,讨论水泥土抗拉性能随各因素变化的规律。通过观察破坏形式,分析试验结果,探究了影响水泥土抗拉强度的主要因素,分析了水泥土在不同养护条件下抗拉强度随水泥掺量和养护时间变化的一般规律以及氯化钠对水泥土强度增长作用机理。试验结果表明:在清水和氯化钠溶液不同养护条件下,水泥土抗拉强度均随其水泥掺量和养护时间的增加而增加;其中,清水条件下水泥土强度持续增加,达到60 d时趋于稳定;氯化钠溶液条件下水泥土早期强度有一定的促进作用,但后期对水泥土的抗拉强度具有腐蚀效应。

To study the increasing characteristics of tensile strength of cemented soil and discuss the main factor that influence the tensile strength of cemented soil,the change of tensile strength of cemented soil with different cement contents under different curing conditions is analysed in splitting test,the compressive properties of these cement-soil is compared,and the change regularities of the tensile properties of these cemented soil with different factors are discussed. By observing the failure modes, and analyzing the experimental result the main factors influencing the tensile strength of cement-soil are explored,the general rules of the tensile strength of cement-soil varying with cement content and curing time,and the effect mechanism of sodium chloride on the strength of cemented soil are analyzed. The experimental result shows that（ 1） under water and sodium chloride solution curing conditions,the tensile strength of cement-soil increased with the increase of cement content and curing time;（ 2） the strength of cemented soil in the water condition increased continuously,and reached the stability on the 60th day;（ 3） sodium chloride solution had effect on promoting the early strength of cement-soil,but the tensile strength of cement-soil suffered from corrosion in the later stage.