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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

26卷

期数:

2009年03期

页码:

32-36

栏目:

出版日期:

2009-09-20

文章信息/Info

Title:

Residual Flexural Strength of Recycled ConcreteAfter Elevated-temperatures

作者:

肖建庄¹,黄运标^1,2,郑永朝³

1.同济大学建筑工程系,上海200092;2.上海阳光欧洲城投资发展(集团)有限公司,上海201206;3.中国建筑技术集团有限公司,北京100013

Author(s):

XIAO Jian-zhuang¹, HUANG Yun-biao^1,2, ZHENG Yong-chao³

1. Department of Building Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai EuropenSunshine Plaza Investment Development Group Co. Ltd., Shanghai 201206, China; 3. ChinaBuilding Technique Group Co. Ltd., Beijing 100013, China

关键词:

再生混凝土;  高温;  残余抗折强度;  再生粗骨料;  取代率

Keywords:

recycled concrete;  elevated-temperature;  residual flexural strength;  recycled coarse aggregate;  replacement percentage

分类号:

TU528.041

DOI:

-

文献标志码:

A

摘要:

完成了150块不同再生粗骨料取代率(0%、30%、50%、70%、100%)下再生混凝土棱柱体试块在20 ℃～800 ℃下的高温试验。通过对高温中和高温后试验现象与数据的对比,研究了高温后再生混凝土的残余抗折强度,分析了高温后再生混凝土的残余抗折强度与经历温度之间的相互关系与变化特点,同时与已有高温后再生混凝土的残余抗压强度进行了对比分析。最后,提出了基于试验统计的再生混凝土残余抗折强度与经历温度之间的建议公式。结果表明:随经历温度的升高,高温后再生混凝土的残余抗折强度整体上逐渐下降; 与残余抗压强度相比,再生粗骨料取代率对高温后再生混凝土的残余抗折强度影响不明显。

Abstract:

Based on the flexural test of 150 prism specimens after elevated-temperatures ranging from 20 ℃ to 800 ℃, the fire performance of recycled aggregate concrete(RAC)with different replacement percentages of recycled coarse aggregate(RCA)(i.e. 0%, 30%, 50%, 70%, 100%)was investigated. Through contrasting and analyzing the test phenomenon as well as the data at elevated-temperatures and after elevated-temperatures, the residual flexural strength of recycled concrete was studied, meanwhile, the varying characteristics and the relationships between the residual flexural strength of recycled concrete and exposed temperatures were analyzed. Finally, the suggestion formulas of residual flexural strength of recycled concrete and exposed temperatures in terms of the testing statistics were proposed. The results show that the residual flexural strength of recycled concrete after elevated-temperatures decreases with the elevating of exposed temperatures, and the effect of the replacement percentage of RCA on the residual flexural strength of recycled concrete after elevated-temperatures is unnoticeable compared to that of the residual compressive strength.

参考文献/References:

[1] 肖建庄,李佳彬,孙振平,等.再生混凝土的抗压强度研 究[J].同济大学学报:自然科学版,2004,32(12):1558-1561.XIAO Jian-zhuang,LI Jia-bin,SUN Zhen-ping,et al.Study on Compressive Strength of Recycled Aggregate Concrete[J].Journal of Tongji University:Nat-ural Science,2004,32(12):1558-1561.
[2]肖建庄,黄运标.高温后再生混凝土残余抗压强度[J].建筑材料学报,2006,9(3):255-259.XIAO Jian-zhuang,HUANG Yun-biao.Residual Compressive Strength of Recycled Concrete After High Temperature[J].Journal of Building Materials,2006,9(3):255-259.
[3]GB/T 50081-2002,普通混凝土力学性能试验方法标准[S].GB/T 50081-2002,Standard for Test Method of Mechanical Properties on Ordinary Concrete[S].
[4]MOHAMEDBHAI G T G.Effect of Exposure Time and Rates of Heating and Cooling on Residual Strength of Heated Concrete[J].Magazine of Concrete Research,1986,38(136):151-158.
[5]杨文科.试论抗压与抗折的辩证关系及综合值的概念[J].混凝土,2003(8):13-16.YANG Wen-ke.Study on Contradictory Relationship Between Compressive and Bending Strength and Conception of Synthetic Value[J].Concrete,2003(8):13-16.

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备注/Memo

备注/Memo:

收稿日期:2009-06-12
基金项目:“十一五”国家科技支撑计划项目(2008BAK48B03);?
作者简介:肖建庄(1968-),男,山东沂南人,教授,博士研究生导师,工学博士,E-mail:jzx@tongji.edu.cn。

常用功能

更新日期/Last Update: 2009-09-20