机制砂混凝土的力学性能及体积变形试验研究  

Experimental study on mechanical properties and volume deformation of manufactured sand concrete

作　　者：吴振元 曾路实 汪洋 李华 王育江[3,4] WU Zhenyuan;ZENG Lushi;WANG Yang;LI Hua;WANG Yujiang(Shenzhen Municipal Engineering Corp.,Shenzhen 518000,China;Shenzhen Metro Construction Group Co.,Ltd.,Shenzhen 518035,China;State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,China;College of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]深圳市市政工程总公司,广东深圳518000 [2]深圳地铁建设集团有限公司,广东深圳518035 [3]江苏苏博特新材料股份有限公司高性能土木工程材料国家重点实验室,江苏南京211103 [4]东南大学材料科学与工程学院,江苏南京211189

出　　处：《混凝土与水泥制品》2024年第5期34-36,41,共4页China Concrete and Cement Products

基　　金：国家自然科学基金资助项目(52008193);高性能无机功能材料工程技术研究中心项目(ZB22108)。

摘　　要：对比研究了相同配合比条件下,机制砂和天然砂对C35混凝土的力学性能及体积变形的影响。结果表明:机制砂混凝土的力学性能明显优于天然砂混凝土;180 d时,机制砂混凝土的抗压强度较天然砂混凝土提高了15.3%,劈裂抗拉强度提高了4.3%;90 d时,机制砂混凝土的静弹性模量较天然砂混凝土提高了5.8%;机制砂混凝土的体积变形明显大于天然砂混凝土,180 d时,机制砂混凝土较天然砂混凝土的自收缩增大了约16.4%;机制砂中石粉掺量不宜过大,否则会显著增大混凝土的收缩开裂。The effects of mechanism sand and natural sand on the mechanical properties and volume deformation of C35 concrete under the same mix proportion conditions were studied.The results show that the mechanical properties of manufactured sand concrete are significantly better than those of natural sand concrete.At 180 d,the compressive strength of manufactured sand concrete increases by 15.3%compared to natural sand concrete,and the splitting tensile strength increases by 4.3%.At 90 d,the static elastic modulus of manufactured sand concrete increases by 5.8%compared to natural sand concrete.The volume deformation of manufactured sand concrete is significantly greater than that of natural sand concrete.At 180 d,the self-shrinkage of manufactured sand concrete increases by about 16.4%compared to natural sand concrete.The content of stone powder in the manufactured sand should not be too large,otherwise it will significantly increase the shrinkage and cracking of concrete.

关 键 词：机制砂混凝土 天然砂混凝土 力学性能 体积变形 

分 类 号：TU528.1[建筑科学—建筑技术科学]