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

卷:

29卷

期数:

2012年04期

页码:

18-24

栏目:

出版日期:

2012-12-30

文章信息/Info

Title:

Experiment and Mechanism Modeling Analysis on Creep of Recycled Aggregate Concrete

作者:

肖建庄,范玉辉

同济大学 建筑工程系,上海 200092

Author(s):

XIAO Jian-zhuang, FAN Yu-hui

Department of Building Engineering, Tongji University, Shanghai 200092, China

关键词:

再生粗骨料;  再生混凝土;  徐变;  模型化分析;  抗压强度;  弹性模量

Keywords:

recycled coarse aggregate;  recycled aggregate concrete;  creep;  modeling analysis;  compressive strength;  elastic modulus

分类号:

TU528

DOI:

-

文献标志码:

A

摘要:

通过改变再生粗骨料取代率,对再生混凝土的立方体抗压强度、棱柱体抗压强度、弹性模量等力学性能和收缩徐变性能进行了试验。在试验研究的基础上,通过将再生混凝土模型化为单骨料平面模型,建立了再生混凝土徐变的有限元计算模型,利用ANSYS软件分析了单轴受压时模型化再生混凝土的徐变发展特点,揭示了再生混凝土徐变的机理。研究结果表明:再生混凝土的28 d立方体抗压强度和弹性模量随再生粗骨料取代率的增加而降低,再生混凝土的收缩和徐变随再生粗骨料取代率的增加而增加; 模型化再生混凝土中由于受到新砂浆、老砂浆徐变的影响,随着时间的推移,砂浆应力将向粗骨料转移; 利用ANSYS软件计算所得模型化再生混凝土徐变和试验数据基本吻合。

Abstract:

The experiment on creep and mechanical properties of recycled aggregate concrete(RAC)was conducted by varying the recycled coarse aggregate(RCA)replacement percentage. Based on the experiment study, a finite element model was established to analyze the creep mechanism by modeling the recycled concrete as a plane model with one aggregate. The creep of modeled RAC under uniaxial compression was simulated by ANSYS software. The study results show that the 28 d cube compressive strength and elastic moduli of RAC are reduced whereas the shrinkage and creep of RAC increase with the increase of RCA replacement percentage. The simulation results reveal that the stress of new mortar and old mortar will transfer to the coarse aggregate due to the creep of mortar. The creep of modeled RAC by ANSYS software is consistent well with the experiment result.

参考文献/References:

[1] 惠荣炎,黄国兴,易冰若.混凝土的徐变[M].北京:中国铁道出版社,1988.HUI Rong-yan,HUANG Guo-xing,YI Bing-ruo.Creep of Concrete[M].Beijing:China Railway Press,1988.
[2]TROXELL G E,RAPHAEL J M,DAVIS R E.Long-time Creep and Shrinkage Tests of Plain and Reinforced Concrete[C]//ASTM.Proceedings of ASTM International 58.New York:ASTM,1958:1101-1120.
[3]KORDINA K.Experiments on the Influence of the Mineralogical Character of Aggregates on the Creep of Concrete[J].RILEM Bulletin,1960(6):7-22.
[4]SHIDELER J J.Lightweight-aggregate Concrete for Structural Use[J].ACI Journal,1957,54(10):299-328.
[5]NEVILLE A M,DILGER W H,BROOKS J J.Creep of Plain and Structural Concrete[M].New York:Construction Press,1983.
[6]肖建庄,雷 斌.再生混凝土耐久性能研究[J].混凝土,2008(5):83-89.XIAO Jian-zhuang,LEI Bin.Investigation on the Durability of Recycled Concrete[J].Concrete,2008(5):83-89.
[7]DOMINGO-CABO A,LAZARO C,LOPEZ-GAYARRE F,et al.Creep and Shrinkage of Recycled Aggregate Concrete[J].Construction and Building Materials,2009,23(7):2545-2553.
[8]COUNTO U J.The Effect of the Elastic Modulus of the Aggregate on the Elastic Modulus,Creep and Creep Recovery of Concrete[J].Magazine of Concrete Research,1964,48(16):129-138.
[9]GRANGER L P,BAZANT Z P.Effect of Composition on Basic Creep of Concrete and Cement Paste[J].Journal of Engineering Mechanics,1995,121(11):1261-1270.

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备注/Memo

备注/Memo:

收稿日期:2012-10-17
基金项目:国家自然科学基金项目(51178340);?
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: 2012-12-20