自密实沙漠砂贫混凝土的力学特征及其工程应用研究  

Study on mechanical characteristics and engineering application of sand lean concrete in self-compacting desert

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 750000,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750000

出　　处：《混凝土》2024年第1期165-168,173,共5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：基于室内模型试验,对不同配合比下自密实沙漠砂贫混凝土的强度和刚度参数进行了标定,结果表明:(1)自密实沙漠砂贫混凝土中水泥含量与单轴抗压强度和弹性模量近似呈线性增长关系;(2)水泥含量在11.9%~21.3%时,单轴抗压强度为1.5~7 MPa,弹性模量为120~360 MPa;(3)与普通混凝土相比,自密实沙漠砂贫混凝土峰值应力处的应变约为普通混凝土的10倍,表明其延性较好;(4)与传统压实土相比,自密实沙漠砂贫混凝土具有强度高和变形模量大的优势;(5)在适宜的水灰比下,沙漠砂贫混凝土可实现自密实,提高了施工速度和机械化水平,可用于公路快速拓宽、管廊回填、桥台台背快速回填和高边坡整体式路基等工程。Based on the laboratory model test,the strength and stffness parameters of the self-compacting desert sand lean concrete with different mix ratios were calibrated.The results show that:(1)The cement content in the self-compacting desert sand lean concrete is related to the uniaxial compressive strength and elastic modulus,approximate linear growth relationship;(2)When the cement content is from 11.9%to 21.3%,the uniaxial compressive strength is between 1.5 MPa and 7 MPa,and the elastic modulus is between 120 MPa and 350 MPa;(3)Compared with ordinary concrete,the strain at the peak stress of the self-compacting desert sand-lean concrete is about ten times that of ordinary concrete,indicating that its ductility is better;(4)Compared with the traditional compacted soil,the self-compacting desert sand-lean concrete has high strength and large deformation modulus;(5)Under a suitable water-cement ratio,desert sand-lean concrete can achieve self-compacting,improve construction speed and mechanization level,and can be used for rapid road widening,pipe gallery backfill,bridge abutment back fast backfll and high edge slope monolithic roadbed and other projects.

关 键 词：自密实沙漠砂贫混凝土 单轴抗压强度 弹性模量 峰值应变 传统压实土 

分 类 号：TU528.01[建筑科学—建筑技术科学]