【作者】 马芹永； 韩兴腾； 张经双；

【Author】 MA Qin-yong,HAN Xing-teng,ZHANG Jing-shuang (Underground Engineering Research Center for Mining of Ministry of Education,Anhui University of Science and Technology,Huainan,232001,China)

【机构】 安徽理工大学矿山地下工程教育部工程研究中心；

【摘要】 通过对喷射混凝土用预拌干料的试验研究,得到预拌干料贮存期对抗折强度影响的规律。分别研究了预拌干料的砂子含水率为0%,0.5%和1.0%的情况下,贮存期分别为3d,7d,11d,20d和28d时,与贮存期为0d相比时抗折强度的损失。研究结果表明,对于C30混凝土,贮存7d时,砂子含水率为0.5%和1.0%时的强度损失率分别为11.4%和12.6%:贮存28d时,砂子含水率为0.5%和1.0%时的强度损失率分别为16.4%和17.6%。预拌干料贮存期的研究为保证工程使用喷射预拌混凝土质量提供重要的依据。更多还原

【Abstract】 Through the experimental research of the storage period of using dry-mixed materials in shotcrete, variations of flexural strength were obtained.According to the studies on the storage period of dry-mixed materials in 7d,11d,15d,20d and 28d,compared with in Od,the loss of flexural strength were obtained under different sand water content(0%,0.5%and 1.0%).The results show,strength loss rate of C30 concrete is 11.4% when the sand water content is 0.5%in the 7d,while strength loss rate is 12.6%when the sand water content is 1.0%.And when the storage period is 28d,the strength loss is 16.4%and 17.6%while the sand water content is 0.5%and 1.0%.The studies of dry-mixed materials on storage period provide supports to the using of dry-mixed shotcrete in engineering application.更多还原