机制砂陶粒混凝土抗拉性能试验研究  

Experimental Study on Tensile Strength of Manufactured-sand Expanded-shale Concrete

作　　者：李长永[1,2] 陈淮[1] 赵顺波[2] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]华北水利水电学院土木与交通学院,河南郑州450011

出　　处：《郑州大学学报（工学版）》2011年第1期13-17,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省高校创新人才培养工程资助项目(豫教高[2004]294号);郑州市科技领军人才培育计划资助项目(096SYJH23105)

摘　　要：通过试验研究了水泥用量、水灰比、砂率对机制砂陶粒混凝土抗拉性能的影响.试验结果表明:机制砂陶粒混凝土的劈裂抗拉强度主要取决于陶粒自身的抗劈裂能力,砂率对混凝土劈裂抗拉强度的影响没有规律性,水泥用量较低时增加砂率可增大混凝土的轴心抗拉强度和抗弯强度,水泥用量较高时砂率对混凝土的轴心抗拉强度和抗弯强度的影响不明显;劈裂抗拉和轴心抗拉强度均随着水灰比的增大而降低,但抗弯强度的变化不明显;存在着使抗拉弹性模量最大的最佳砂率和水灰比.建议给出了拌合物工作性和强度均满足要求的LC35级机制砂陶粒混凝土的配合比,可供工程实际应用参考.The experiments were conducted to study the effects of cement content,water to cement ratio and sand ratio on the tensile performances of lightweight concrete composited with manufactured sand and expanded shale.It is proved that the splitting tensile strength is mainly controlled by the capacity against splitting of expanded-shale itself,no rrgularity exists between splitting tensile strength and sand ratio.Increasing sand ratio can raise the axial tensile strength and the flexural tensile strength while cement content is lower,but there is no obvious influence when the cement content is larger.The splitting tensile strength and axial tensile strength decrease with the increase of water to cement ratio,but the flexural tensile strength does not change obviously.There are the optimum values of sand ratio and water to cement ratio resultin in the largest tensile elastic modulus of concrete.The mix proportion is suggested which satisfies the technical requirements of fresh concrete workability and LC35 lightweight concrete strength..

关 键 词：轻骨料混凝土 机制砂 陶粒 试验研究 抗拉性能 

分 类 号：TU528.2[建筑科学—建筑技术科学]