欢迎访问《建筑材料学报》编辑部网站！

引用本文:	严捍东,吴仕成,桂苗苗.再生粗骨料最大堆积密度及其对混凝土性能影响[J].建筑材料学报,2015,18(3):482-486

【打印本页】【下载PDF全文】【查看/发表评论】【EndNote】【RefMan】【BibTex】

←前一篇|后一篇→

过刊浏览高级检索

本文已被：浏览 1379次下载 0次	码上扫一扫！
分享到：微信更多字体:加大+\|默认\|缩小-
再生粗骨料最大堆积密度及其对混凝土性能影响
严捍东¹, 吴仕成¹, 桂苗苗²
1.华侨大学土木工程学院，福建厦门361021;2.福建科之杰新材料有限公司，福建厦门361100

摘要:

为研究再生粗骨料级配对混凝土性能的影响，通过测定连续级配再生粗骨料最大堆积密度、吸水率、筛分析及新拌混凝土坍落度和硬化混凝土7，28，60d抗压强度，最终确定达到最紧密堆积状态时160～315mm与50～200mm两种单粒级再生粗骨料的最佳混合质量比.结果表明：随着160～315mm与50～200mm两种单粒级再生粗骨料混合质量比的逐渐降低，连续级配再生粗骨料的最大堆积密度及吸水率均呈现出先增大后减小的趋势，但波动不大.随着50～200mm单粒级再生粗骨料所占比例的增加，不同连续级配再生粗骨料对新拌混凝土的工作性影响十分明显，同时，对硬化混凝土的抗压强度也有较大影响，两者均呈现出先增大后减小的趋势；160～315mm与50～200mm两个单粒级再生粗骨料存在一个最佳的混合质量比70∶30.

关键词: 再生粗骨料骨料级配再生骨料混凝土工作性抗压强度

DOI：103969/jissn1007 9629201503021

分类号:

基金项目:福建省高校产学合作科技重大项目（2012Y4010）

Maximum Packing Density of Recycled Coarse Aggregate and Its Effects on Properties of Concrete

YAN Handong¹, WU Shicheng¹, GUI Miaomiao²

1.College of Civil Engineering, Huaqiao University, Xiamen 361021, China;2.Fujian KZJ New MaterialsCo., Ltd., Xiamen 361100, China

Abstract:

To study the effect of continuous gradation of recycled coarse aggregate(RCA) on the concrete properties, the optimum mixture mass ratio(MMR) between two kinds of single grain class of 160315mm and 50200mm, while reaching the state of the maximum packing density(MPD), was finally determined by means of measuring maximum packing density, water absorption and sieving analysis of continuous gradation RCA as well as the slump of the fresh concrete and the compressive strength of the hardened concrete at the ages of 7d, 28d and 60d. The experimental results show that both the MPD and water absorption of the continuous gradation of the RCA all appear a trend of early increase and late decrease along with the gradual decrease of the MMR between two kinds of single grain class of 160315mm and 50200mm, but the fluctuations of these values are not big. The influences of different continuous gradation RCA on the workability of the fresh concrete are very remarkable with the increase of the mass proportion of the 50200mm single grain class, and the effect on the compressive strength of the hardened concrete is also very significant. Both of them are all shown a trend of early increase and late decrease. The optimum MMR between 160315mm and 50200mm of single grain class of the RCA is 70∶30.

Key words: recycled coarse aggregate(RCA) aggregate gradation recycled aggregate concrete workability compressive strength