再生粗骨料最大堆积密度及其对混凝土性能影响

发布时间：2018-06-18 12:13

本文选题：再生粗骨料 + 骨料级配　；参考：《建筑材料学报》2015年03期

【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.
[Abstract]:In order to study the effect of recycled coarse aggregate gradation on concrete performance, the maximum packing density, water absorption, sieve analysis, slump of fresh concrete and compressive strength of hardened concrete for 72860 days were measured. Finally, the optimal mixing mass ratio of 16.0~31.5mm and 5.0~20.0mm is determined when the compactness is reached. The results show that with the decrease of the mixing mass ratio of 16.0~31.5mm and 5.0~20.0mm, the maximum packing density and water absorption of recycled coarse aggregate with continuous gradation increase first and then decrease, but there is little fluctuation. With the increase of the proportion of recycled coarse aggregate in single grain grade of 5.0~20.0mm, the influence of recycled coarse aggregate with different continuous gradation on the workability of fresh concrete is obvious, and the compressive strength of hardened concrete is also greatly affected. Both of them showed a tendency of increasing first and then decreasing. There was an optimum mixing mass ratio of 7.0: 3.0 between 16.0U 31.5mm and 5.0~20.0mm.
【作者单位】：华侨大学土木工程学院;福建科之杰新材料有限公司;
【基金】：福建省高校产学合作科技重大项目(2012Y4010)
【分类号】：TU528

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