西安建筑科技大学学报(自然科学版)

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、7 d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3 d内,粘聚力快速增长,养护3 d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7 d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 7 days 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 3 days of curing, but after 3 days, 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 6 percent, 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 7 days.

引言
1 试验方案
2 试验结果分析
3 结论

表1 不同水泥掺量砂最优含水率、最大干密度<br/>Tab.1 The optimum moisture content and maximum dry density of different cement admixture sand

表1 不同水泥掺量砂最优含水率、最大干密度
Tab.1 The optimum moisture content and maximum dry density of different cement admixture sand

表2 不同水泥掺量、不同养护龄期水泥改良砂粘聚力、内摩擦角值<br/>Tab.2 Cohesion and internal friction angle value of cement modified sand with different cement content and curing time

表2 不同水泥掺量、不同养护龄期水泥改良砂粘聚力、内摩擦角值
Tab.2 Cohesion and internal friction angle value of cement modified sand with different cement content and curing time

图1 水泥掺量2%改良砂粘聚力随养护龄期关系<br/>Fig.1 The relationship between cohesion and curing time of modified sand with 2 percent cement

图1 水泥掺量2%改良砂粘聚力随养护龄期关系
Fig.1 The relationship between cohesion and curing time of modified sand with 2 percent cement

图2 水泥掺量6%改良砂粘聚力随养护龄期关系<br/>Fig.2 The relationship between cohesion and curing time of modified sand with 6 percent cement

图2 水泥掺量6%改良砂粘聚力随养护龄期关系
Fig.2 The relationship between cohesion and curing time of modified sand with 6 percent cement

图3 水泥掺量10%改良砂粘聚力随养护龄期关系<br/>Fig.3 The relationship between cohesion of modified sand and curing age time with 2 percent cement

图3 水泥掺量10%改良砂粘聚力随养护龄期关系
Fig.3 The relationship between cohesion of modified sand and curing age time with 2 percent cement

表3 养护不同龄期水泥砂粘聚力拟合参数单位:10-3<br/>Tab.3 Cohesion fitting parameters of cement modified sand cured for differenttime unit: 10-3

表3 养护不同龄期水泥砂粘聚力拟合参数单位:10-3
Tab.3 Cohesion fitting parameters of cement modified sand cured for differenttime unit: 10-3

图4 养护不同龄期时水泥砂粘聚力拟合参数a与水泥掺量关系<br/>Fig.4 Relationship between cohesion fitting parameter a and cement content of cement modified sand cured for different time

图4 养护不同龄期时水泥砂粘聚力拟合参数a与水泥掺量关系
Fig.4 Relationship between cohesion fitting parameter a and cement content of cement modified sand cured for different time

图5 养护不同龄期时水泥砂粘聚力拟合参数b与水泥掺量关系<br/>Fig.5 Relationship between cohesion fitting parameter b and cement content of cement modified sand cured for different time

图5 养护不同龄期时水泥砂粘聚力拟合参数b与水泥掺量关系
Fig.5 Relationship between cohesion fitting parameter b and cement content of cement modified sand cured for different time

图6 水泥改良砂内摩擦角与养护龄期关系<br/>Fig.6 Relationship between friction angle and curing age of modified sand

图6 水泥改良砂内摩擦角与养护龄期关系
Fig.6 Relationship between friction angle and curing age of modified sand

图7 水泥改良砂内摩擦角与水泥掺量关系<br/>Fig.7 Relationship between friction angle and cement content of modified sand

图7 水泥改良砂内摩擦角与水泥掺量关系
Fig.7 Relationship between friction angle and cement content of modified sand

图8 LIOO SZ850显微镜放大205倍后水泥改良砂颗粒间接触状态<br/>Fig.8 Contacting state of cement modified sand enlarged 205 times by LIOO SZ850 magnifier

图8 LIOO SZ850显微镜放大205倍后水泥改良砂颗粒间接触状态
Fig.8 Contacting state of cement modified sand enlarged 205 times by LIOO SZ850 magnifier

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备注

引言

1 试验方案

2 试验结果分析

3 结论

期刊信息