自密实沙漠砂贫混凝土饱水软化后的力学特征与工程应用  

Mechanical characteristics and engineering application of self-compacting desert sand lean concrete after wetting and softening

作　　者：关英林 邹承君 杨宝平 康亚明 GUAN Yinglin;ZOU Chengjun;YANG Baoping;KANG Yaming(School of Chemistry and Chemical Engineering,North Minzu University,Yinchuan 750021,China;School of Electromechanical Engineering,North Minzu University,Yinchuan 750021,China;Ningxia Yueyuan Engineering Co.,Ltd.,Guyuan 756000,China)

机构地区：[1]北方民族大学化学与化学工程学院,宁夏银川750021 [2]北方民族大学机电工程学院,宁夏银川750021 [3]宁夏跃元工程有限公司,宁夏固原756000

出　　处：《混凝土》2024年第2期176-179,共4页Concrete

基　　金：国家自然科学基金(51569001);北方民族大学校企联合横向项目(2102000247)。

摘　　要：基于饱水软化试验,对不同配合比下自密实沙漠砂贫混凝土饱水后的力学性能及变形特征进行了试验研究,结果表明:(1)饱水软化后抗压强度降低了约30%~40%,弹性模量降低了约12%~29%,与传统的压实土相比,饱水后的强度和刚度参数依然保持在较高的水平;(2)随着水泥含量的提高,其峰值应力对应的轴向应变略有增加,说明其延性在增强;(3)用自密实沙漠砂贫混凝土对沙湖750 kV变电站地面塌陷进行了灌注浆处理,现场试验取得了成功。Based on the water-saturation softening test,the mechanical properties and deformation characteristics of self-compacting sand lean concrete in desert under different mixing ratios were tested and studied.The results showed as follow:(1)After saturated softening,the compressive strength decreases by from 30%to 40%,and the elastic modulus decreases from 12%to 29%.Compared with the traditional compaction soil,the strength and stiffness parameters of saturated soil still remain at a higher level.(2)With the increase of cement content,the axial strain corresponding to the peak stress increases slightly,indicating that the ductility increases.(3)The ground collapse of Shahu 750 kV substation was treated by grouting with self-compacting desert sand lean concrete,and the field test was successful.

关 键 词：自密实沙漠砂贫混凝土 抗压强度 弹性模量 峰值应变 强度退化 

分 类 号：TU528.53[建筑科学—建筑技术科学]