石灰粉煤灰水泥稳定黄土的力学性能研究  

Experimental Investigations on the Strength Property of Lime-Fly Ash-Cement Stabilized Loess

作　　者：刘雄美 LIU Xiongmei(China Railway 21^(st)Bureau Group Second Engineering Co.Ltd.,Lanzhou Gansu 730000,China)

机构地区：[1]中铁二十一局集团第二工程有限公司,甘肃兰州730000

出　　处：《铁道建筑技术》2021年第9期4-8,共5页Railway Construction Technology

基　　金：甘肃省建设科技攻关项目(JK2019-25)。

摘　　要：以石灰、粉煤灰和硫铝酸盐水泥共同稳定的黄土试样为研究对象,通过标准击实及无侧限抗压强度试验,研究了石灰、粉煤灰和硫铝酸盐水泥的掺量和养护龄期对稳定黄土最大干密度、最优含水率和无侧限抗压强度的影响。结果表明:随无机结合材料掺量的增加稳定黄土最优含水率逐渐增大、最大干密度减小;在无机结合材料掺量一定的条件下,随着硫铝酸盐水泥掺量的增加最优含水率和最大干密度同时增大;无侧限抗压强度随无机结合材料掺量(20%~30%)的增加而增大,随养护龄期的发展总体上不断增长,前期(1~7 d)强度增长速度慢,后期强度增长速度变快;通过对无侧限抗压强度数据的拟合回归,建立了稳定黄土的无侧限抗压强度与孔隙率、硫铝酸盐水泥体积掺量、无机结合材料体积掺量的关系。所得成果为稳定黄土的设计和施工提供了一种新思路。This paper discussed the loess stabilized by lime,fly ash and sulphate aluminate cement.The content of lime,fly ash and sulphate aluminate cement and curing time effected on the maximum dry density,optimal moisture content and unconfined compressive strength were studied by standard tamping test and unconfined compressive strength test.The results show that the optimal moisture content of loess gradually increases and the maximum dry density decreases with the increase of the content of binder.At a certain content of binder,the optimal moisture content and maximum dry density increase with the increase of sulphate aluminate cement content.The unconfined compressive strength increases with the increase of the binder content(20%~30%),and generally increases with the curing time.The strength growth rate of early time(1~7 d)is slower than that of latter.The relationship between porosity,cement content,content of binder and unconfined compressive strength of stabilized loess is established using the fitting regression of experimental data.The results obtained will provide a new idea with the design and construction of stabilized loess.

关 键 词：黄土 石灰 粉煤灰 硫铝酸盐水泥 无侧限抗压强度 

分 类 号：TU444[建筑科学—岩土工程]