再生细骨料混凝土抗压强度试验

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发布时间：2021-10-29

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通过立方体抗压强度试验，研究了再生细骨料取代率对再生混凝土抗压强度的影响。结果表
明：当再生细骨料取代率小于 3O 时，再生细骨料对再生混凝土的抗压强度影响不大；当再生细骨
料取代率大于 30 时，再生混凝土的抗压强度明显降低；当再生细骨料取代率为 100％时，再生混
凝土的抗压强度只达到普通混凝土抗压强度的 61％；掺入再生细骨料后，再生混凝土抗压强度的
离散性变化较大，当再生细骨料取代率在 0 ～ 100 时，再生混凝土的抗压强度标准差在 1．36～
4．17 M Pa之间。
关键词：再生细骨料；再生混凝土；取代率；抗压强度；离散性
中图分类号：TU528．041 文献标志码：A
Experim ent on Com pressive Strength of Recycled Fine Aggregate Concrete
XIAO J ian—zhuang ”，FAN Yu—hui ，LIN Zhuang—bin
(1．Department of Building Engineering，Tongji University，Shanghai 200092，China；
2． Key Laboratory of Advanced Civil Engineering M aterials of M inistry of Education，
Tongji University，Shanghai 200092，China)
Abstract：A uthors studied the effects of the recycled fine aggregate (RFA) replacem ent ratio on
com pressive strength of recycled concrete through cubic com pressive strength experiment． The
result shows that there is little effect on the compressive strength of recycled concrete when the
RFA replacement ratio is less than 30 ；the compressive strength Of recycled concrete is reduced
when the RFA replacement ratio is more than 3O ．W hen the RFA replacement ratio is 100 ，
the com pressive strength of recycled concrete is 6 1 than that of ordinary concrete． There is a
significant change in the discreteness of the com pressive strength of recycled concrete after the
RFA is m ixed．The standard deviation of the compressive strength of recycled concrete is between
1．36 M Pa and 4．17 M Pa when the RFA replacem ent ratio varies from 0 to 100 ．
Key words：recycled fine aggregate；recycled concrete；replacem ent ratio；compressive strength；
di screteness
引
目前，各国学者对再生粗骨料混凝土进行了全
面的研究，再生粗骨料混凝土已经开始用于实际工
程Ⅲ 。相比较而言，再生细骨料混凝土的研究还比
较少，仍缺乏相关数据的积累。郝彤等研究了再
生细骨料对再生混凝土强度和干燥收缩的影响，发
现当采用基于自由水灰比的配合比设计方法和二次
搅拌工艺时，再生混凝土的强度基本与普通混凝土
相同；但由于再生细骨料中老砂浆的存在，再生混凝