从微结构分析温度对水泥土强度形成的影响  

Analysis on the effects of temperature fluctuation on the strength formation of cement-stabilized soils as viewed from microstructure

作　　者：胡昕[1] 洪宝宁[1] 闵紫超[2] 

机构地区：[1]河海大学岩土工程水利部重点实验室 [2]江苏新筑预应力工程有限公司,江苏南京210003

出　　处：《西安建筑科技大学学报（自然科学版）》2007年第5期628-634,640,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(50279008);江苏省交通科学研究计划项目(04Y006);盐城市科技发展计划项目(YKJ2004002)

摘　　要：为研究温度变化对水泥土强度形成的影响，将两种水泥土样分别在25±2℃、10±2℃、0±2℃的温度下进行养护，随后测试各龄期试样的无侧限抗压强度，并拍摄不同龄期各试样的微结构图片，提取并分析微结构特征参数．研究表明：龄期（1～4d内）较短时，水泥土无侧限抗压强度对温度变化不敏感；在7～40d内，提高养护温度，水泥土无侧限抗压强度显著增大；随着龄期的增长，水泥土微结构量化参数均发生了显著变化，且具有一定的规律性；养护温度高于10℃时，水泥土内部的水泥易于水化；粉土土粒之间缺少结构性联结和相对较低的孔隙比造成了水泥粉土强度相对较低．In order to study the effects of temperature fluctuation on gaining strength, two distinct samples of cement-stabilized soils are conserved under 25 ± 2℃, 10±2℃ ,0±2℃, whereafter their uniaxial compressive strength are mensurated , their photomicrographs of different ages are shot and characteristic parameters of microstructures are up-picked and analyzed. The findings indicate that： when the curing time （within 1～4 days） is shorter, the uniaxial compressive strength of cement-stabilized soils doesn＇t vary markedly with temperature variety, while between 7～40 days,the advancing protected temperature may influence their strength exaltation. Accompanying with stadia increasing characteristic parameters of microstructures are all varying markedly and have certain regulation. When the curing temperature is over 10℃, the cement internal in cement-stabilized soils is easy to hydrate. Because the silt has no structural coupling between grains and has lower hole ratio, the cement-stabilized sih＇s strength is relatively lower.

关 键 词：水泥土 微结构 温度变化 强度形成 

分 类 号：TU411.92[建筑科学—岩土工程]