再生混凝土多孔砖用再生骨料基本性能试验研究

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发布时间：2021-10-29

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：再生混凝土多孔砖与再生混凝土相比有混凝土强度要求低、再生骨料利用率高、生产成本低等优点，非常适合再生混凝
土技术的推广应用。粒径 O～10 mm再生骨料基本性能的试验研究是再生混凝土多孔砖性能研究的基础和关键。再生骨料中细骨料
比例取 85％、90％、95％3个水平，再生骨料中碎砖含量取 O、25％、50％、75％、100％ 5个水平，用全组合的方式在试验室中配制出 3
个系列共 15种再生骨料。按照 GB／T 14684--2001及 GB／T 14685--2001对这 l5种再生骨料的级配、表观密度、吸水率、压碎指标进
行实验。试验结果表明，粒径 0～10mill再生骨料随着骨料中碎砖含量的增多，再生骨料的表观密度、吸水率、压碎指标增大：压碎指
标与吸水率、压碎指标与表观密度呈正比。这个性质与目前再生粗骨料的规律不同，说明混凝土砖用 O～10mm再生骨料的性质不同
于再生粗骨料。
关键词：再牛混凝土多孔砖；再生骨料；表观密度；吸水率；压碎指标
中图分类号：TU522．3 文献标识码：A 文章编号：1001—702X(2011)03—0015—05
Experim ental study on basic properties of recycled aggregate for the production of concrete perforated brick
YANG We~un，LI Pentfei，LIANG~anguo
(School of Civil Engineering and Architecture，Changsha University of Science ＆ Technology，Changsha 4101 14，Hunan，China)
Abstract：Recycled concrete perforated brick，compared with the recycled concrete，have some advantages of low concrete
strength requirements，high utilization rate of recycled aggregate and low production costs． So it is ideal for the promotion and
application of recycled concrete technology．． 0-10 mal size range of the basic properties of recycled aggregate is the basic and key
of the recycled concrete perforated brick．The proportion of recycled aggregate in the fine aggregate to take the three levels of
85％，90％，95％，and the proportion of recycled aggregate in the broken bricks to take the five levels of 0，25％，50％，75％，100％．
A total of 1 5 different types of recycled aggregate in three series were prepared in the laboratory．． Grading，apparent density，water
absorption and crushing value of these 15 types of recycled aggregate were texted in accordance with the specifications of GB／T
14684-- 2001 and GB／T 14685-- 2001．The results of experiment show that with the broken bricks content in recycled aggregate of
size range 0-10 mm increased，the apparent density，water absorption and crushing value increased；appositive correlation between
crushing value and water absorption，and between crashing value and apparent density too．These properties are different from the
current research of recycled coarse aggregate，which means that the properties of ret’v． cled aggregate of size range 0～10 mm for
concrete brick use is different from
Key w ords：recycled concrete
0 引言
recycled coarse aggregate．
perforated brick；recycled aggr egate：apparent density water absorption；crushing value
据资料介绍_l_3】，1995年，日本建筑垃圾中混凝土占38％，
收稿日
作者简
导师。
期：2010—1 1—21
介：杨伟军，男，1962年生，湖南益阳人，教授，博士后，博士生
E—mail：mgbyrh@ 163．COB。
约3800万t；美国每年大约产生6000万t废弃混凝土；欧共
体废弃混凝土的排放量从 1980年的5500万t增加到 2000
年的 16 200万 t；我国每年新建和拆房废弃混凝土量己超过
8000万 t；2003年长沙市房屋拆迁面积 42．9万 m ，按每平方
米产生 0．6 t建筑垃圾计算，则要产生 26万 t建筑垃圾，加上
新建房屋产生的建筑垃圾，总量将超过50万t。处理这些垃
圾不仅要花费大量的资金，还将大量占地存放，污染环境，浪