不同养护龄期下再生粗骨料混凝土拉伸本构关系
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摘要
采用MTS疲劳试验机进行了再生粗骨料混凝土轴向拉伸试验,研究分析再生粗骨料取代率对不同养护龄期下再生粗骨料混凝土轴向拉伸应力-应变全曲线的影响规律,并提出了再生粗骨料混凝土拉伸本构关系模型.研究结果表明:再生粗骨料混凝土轴向拉伸应力-应变全曲线的上升段斜率较普通混凝土低,下降段随着再生粗骨料取代率提高与养护龄期的增长而变陡;再生粗骨料混凝土的弹性模量随着养护龄期的增长呈线性增长,当荷载超过50%之后,其变形模量的下降速度快于普通混凝土;早龄期再生粗骨料混凝土的拉伸峰值应变随着再生粗骨料取代率的增大而增长;养护龄期低于7d时,再生粗骨料混凝土的抗拉强度增长速率快于普通混凝土;再生粗骨料混凝土的拉压比随着养护龄期的增长而下降.
Axial tensile stress-strain curve of recycled coarse aggregate concrete(RCAC)was tested on MTS fatigue test machine.Influence of replacement ratio of recycled coarse aggregate(RCA)and curing age on axial tensile stress-strain curves of RCAC were analyzed,and tensile constitutive model of RCAC was proposed.The results show that the slope of RCAC tensile stress-strain curve on the ascending stage is lower than that of ordinary concrete,and after peak stress the curve droppes steeper with the increase of the replacement ratio of RCA and curing age.Elastic modulus of RCAC is in linear growth with the curing age increasing,and when the load exceeds 50%the deformation modulus of RCAC drop further than ordinary concrete.At the early age,tensile strain at peak stress of RCAC increases with the increase of RCA replacement ratio,the tensile strength growth rate of RCAC is faster than that of ordinary concrete.The tensile-compression strength ratio of RCAC reduces with the curing age.
Axial tensile stress-strain curve of recycled coarse aggregate concrete(RCAC)was tested on MTS fatigue test machine.Influence of replacement ratio of recycled coarse aggregate(RCA)and curing age on axial tensile stress-strain curves of RCAC were analyzed,and tensile constitutive model of RCAC was proposed.The results show that the slope of RCAC tensile stress-strain curve on the ascending stage is lower than that of ordinary concrete,and after peak stress the curve droppes steeper with the increase of the replacement ratio of RCA and curing age.Elastic modulus of RCAC is in linear growth with the curing age increasing,and when the load exceeds 50%the deformation modulus of RCAC drop further than ordinary concrete.At the early age,tensile strain at peak stress of RCAC increases with the increase of RCA replacement ratio,the tensile strength growth rate of RCAC is faster than that of ordinary concrete.The tensile-compression strength ratio of RCAC reduces with the curing age.
引文
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[2] CORINALDESI V.Mechanical and elastic behaviour of concretes made of recycled-concrete coarse aggregates[J].Construction and Building Materials,2010,24(9):1616-1620.
[3] FOLINO P,XARGAY H.Recycled aggregate concrete Mechanical behavior under uniaxial and triaxial compression[J].Construction and Building Materials,2014,56:21-31.
[4]陈宗平,徐金俊,郑华海,等.再生混凝土基本力学性能试验及应力应变本构关系[J].建筑材料学报,2013,16(1):24-32.CHEN Zongping,XU Jinjun,ZHENG Huahai,et al.Basic mechanical properties test and stress-strain constitutive relations of recycled coarse aggregate concrete[J].Journal of Building Materials,2013,16(1):24-32.(in Chinese)
[5] AREZOUMANDI M,SMITH A,VOLZ J S,et al.An experimental study on shear strength of reinforced concrete beams with 100%recycled concrete aggregate[J].Construction and Building Materials,2014,53:612-620.
[6]刘超,白国良,尹磊,等.长期荷载作用下再生混凝土梁裂缝宽度试验研究[J].土木工程学报,2014,47(1):82-87.LIU Chao,BAI Guoliang,YIN Lei,et al.Experimental study on crack width of recycled aggregate concrete beam under long-term loading[J].China Civil Engineering Journal,2014,47(1):82-87.(in Chinese)
[7]尹海鹏,曹万林,张亚齐,等.不同再生骨料取代率再生混凝土柱抗震试验研究[J].世界地震工程,2010(1):57-63.YIN Haipeng,CAO Wanlin,ZHANG Yaqi,et al.An experimental study on the seismic behavior of recycled concrete columns with different recycled aggregate substitution ratios[J].World Earthquake Engineering,2010(1):57-63.(in Chinese)
[8]陈玉泉,杜成斌,周围,等.全级配混凝土轴向拉伸应力-变形全曲线试验研究[J].水力发电学报,2010,29(5):76-81.CHEN Yuquan,DU Chengbin,ZHOU Wei,et al.Experimental study on the complete stress-deformation curve of full grade concrete under axial tension[J].Journal of Hydroelectric Engineering,2010,29(5):76-81.(in Chinese)
[9]张盛东,樊承谋.混凝土受拉损伤本构关系的研究[J].哈尔滨建筑大学学报,2000,33(1):68-72.ZHANG Shengdong,FAN Chengmou.Damage model for concrete under tension[J].Journal of Harbin University of Civil Engineering and Architecture,2000,33(1):68-72.(in Chinese)
[10]王雅思.高性能再生粗骨料混凝土自生收缩影响因素试验研究[D].福州:福州大学,2014.WANG Yasi.Experimental research on the factors influencing the autogenous shrinkage performance of high-performance recycled concrete[D].Fuzhou:Fuzhou University,2014.(in Chinese)
[11]罗素蓉,郑欣,黄海生.再生粗骨料预处理及再生混凝土徐变试验研究[J].建筑材料学报,2016,19(2):242-247.LUO Surong,ZHENG Xin,HUANG Haisheng.Experimentalstudy on pretreatment of recycled coarse aggregate and creep behavior of recycled aggregate concrete[J].Journal of Building Materials,2016,19(2):242-247.(in Chinese)
[12]丁晓唐,王磊,刘海霞,等.确定混凝土受拉应力-应变全曲线的一种新型试验方法[J].水电能源科学,2013,31(12):123-129.DING Xiaotang,WANG Lei,LIU Haixia,et al.A new experimental method of concrete complete direct tensile stress-strain curve[J].Water Resources and Power,2013,31(12):123-129.(in Chinese)
[13]过镇海,张秀琴.砼受拉应力-变形全曲线的试验研究[J].建筑结构学报,1998,9(4):45-53.GUO Zhenhai,ZHANG Xiuqin.Experimental investigation of complete stress-deformation curves of concrete in tension[J].Journal of Building Structures,1998,9(4):45-53.(in Chinese)
[14]刘琼.再生混凝土破坏机理的试验研究和格构数值模拟[D].上海:同济大学,2010.LIU Qiong.The experiment study and lattice model simulation on the failure mechanism of recycle concrete[D].Shanghai:Tongji University,2010.(in Chinese)