水泥改良海南滨海砂早期强度参数研究  

Study on early strength parameters of Hainan′s coastal sand modified by cement

作　　者：吴福宝[1] WU Fubao(China Railway Siyuan Survey And Design Group Co.,LTD,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《西安建筑科技大学学报（自然科学版）》2018年第6期808-813,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：中铁第四勘察设计院集团有限公司道路院科研项目(2014K104)

摘　　要：通过三轴剪切试验,研究了水泥掺量2%、6%、10%的海南东南部滨海砂养护1、3、5、7d早期强度参数的发展规律,并对水泥掺量不同时砂的胶结状态进行了微观试验,得到如下结论:在水泥掺量一定时,在养护龄期3d内,粘聚力快速增长,养护3d后,粘聚力增长速度放缓,养护龄期对水泥改良砂的内摩擦角影响很小;在相同的养护龄期条件下,随着水泥掺量的提高,水泥改良砂的内摩擦角和粘聚力均有提高,水泥掺量高于6%后,砂颗粒处于悬浮状态,随着水泥掺量的增加,内摩擦角基本不再增长,而粘聚力仍有较大增长,采用双曲线函数建立了水泥掺量10%以下、养护龄期7d内改良砂粘聚力、内摩擦角的经验公式.Through triaxial shear test,the development rule of early strength parameters of sand modified with 2%,6% and 10% cement in the coastal eastsouth area of HaiNan cured for 1,3,5 and 7days was studied,and the microscopic experiments were carried out on the cemented state of sand with different cement content,the conclusions are as follows:When the cement content is constant,the cohesion increases rapidly within 3days of curing,but after 3days,cohesion’s growth rate slows down,while curing time has little effect on the friction angle of the modified sand.When the curing age is same,with the increase of cement content,the internal friction angle and cohesion of cement improved sand are both improved,when the cement content is higher than 6percent,the sand particles are in a suspended state,with an increase of cement content,the internal friction angle is almost constant,while cohesion still increases.The hyperbolic function is used to establish the empirical formula of cohesion and internal friction angle of sand modified with cement content less than 10% and curing time within 7days.

关 键 词：滨海砂 水泥改良 早期强度 

分 类 号：TU472[建筑科学—结构工程]