矿物掺合料对再生骨料混凝土轴心抗拉强度影响  

Effect of mineral admixtures on axial tensile strength of recycled aggregate concrete

作　　者：兰华清 王文峰 LAN Huaqing;WANG Wenfeng(Fujian Metrology Institute,Fuzhou 350003;College of Civil engineering,Fuzhou University,Fuzhou 350116)

机构地区：[1]福建省计量科学研究院,福建福州350003 [2]福州大学土木工程学院,福建福州350116

出　　处：《福建建筑》2022年第2期1-4,共4页Fujian Architecture & Construction

摘　　要：再生粗骨料表面粘附着一层旧砂浆,使得再生粗骨料混凝土的粗骨料界面性能复杂,并且抗拉强度低于普通混凝土。通过掺入矿物掺合料以改善骨料界面,提升再生骨料混凝土的抗拉强度与拉压比。研究结果表明,早龄期再生粗骨料混凝土抗拉强度,随粉煤灰掺量提高而降低,并能够有效提高养护龄期大于7 d再生粗骨料混凝土抗拉强度,粉煤灰掺量为10%时最优;当粉煤灰与矿渣的总掺量为30%时,复掺的比例为1∶2时,对再生粗骨料混凝土轴向拉伸性能的改性达到最佳效果。For a layer of old mortar is adhered to the surface of reclaimed coarse aggregate,which makes the interface property of reclaimed coarse aggregate concrete complicated,so the tensile strength of recycled coarse aggregate concrete is lower than that of ordinary concrete.In this paper,mineral admixtures were added to improve aggregate interface and enhance tensile strength and tensile-compression ratio of recycled aggregate concrete.The results of the study showed that,the tensile strength of early-age recycled coarse aggregate concrete decreases with the increase of fly ash content,but it can effectively improve the tensile strength of recycled coarse aggregate concrete at curing age greater than 7 days,and the optimal value of fly ash content is 10%.For the total content of mineral admixture is 30%,the axial tensile properties of recycled coarse aggregate concrete when the ratio of fly ash to slag ratio is 1∶2 is higher than that with other fly ash-slag ratio.

关 键 词：再生粗骨料混凝土 粉煤灰 矿渣 复掺 轴心抗拉强度 

分 类 号：TU5[建筑科学—建筑技术科学]