粗骨料(卵石)对自密实混凝土性能影响试验研究  

EXPERIMENTAL STUDY ON THE INFLUENCE OF COARSE AGGREGATE( PEBBLE) ON PROPERTIES OF SELF-COMPACTING CONCRETE

作　　者：徐欢[1] 刘清[1] 何原野[1] 王振雨[1] 管玉肖 陈波[1] 

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830047

出　　处：《工业建筑》2015年第5期97-101,共5页Industrial Construction

基　　金：国家自然科学基金项目(51368057);新疆大学大学生创新训练计划重点项目(XJU-SRT-13173)

摘　　要：自密实混凝土粗骨料的要求不同于普通混凝土,粗骨料的粒形和级配是衡量粗骨料性能的主要指标。通过人工筛选粗骨料,以粗骨料形状指数和颗粒级配为变量,保证配合比中其他条件相同,配制自密实混凝土,测定坍落度、扩展度、T50时间和V型漏斗流出时间以及7 d强度和28 d强度。试验结果表明:自密实混凝土工作性能、强度不会随着形状指数的增长而规律性增长;相对来说形状指数对工作性能的影响要大于对强度的影响,颗粒级配对强度的影响要大于对工作性能的影响;形状指数和颗粒级配对7 d抗压强度的影响要略大于对28 d强度的影响。基于该试验条件及配合比,当形状指数为0.348,颗粒级配中大石子所占比例为50%时,自密实混凝土的工作性能和力学性能均最佳。The requirements of a self compacting concrete for the coarse aggregate are different from those of an ordinary concrete,the main indicator to measure the performance of coarse aggregate is grain shape and gradation.Taking the shape index and particle gradation of coarse aggregate as the variables,ensuring other conditions being the same,a self-compacting concrete was prepared,whose slumps,expansion rate,T50 time,V type funnel flow time,7 d and 28 d cube compressive strength were tested. Test results showed that self compacting concrete the working performance and strength of the self-compacting concrete could not be increased regularly with an increase in the shape index. Relatively effect on the working performance of the shape index was greater than the effect on strength;influence of particle gradation on strength was greater than the effect on the working performance; effects on 7 d compressive strength of shape index and particle gradation were greater than those on 28 d strength. Based on test condition and mix proportions,when the shape index was 0. 348,big pebble particle gradation in the proportion was50%,the working performance and the mechanical properties of the self compacting concrete were the best.

关 键 词：自密实混凝土 粗骨料 形状指数 颗粒级配 

分 类 号：TU528[建筑科学—建筑技术科学]