钢筋再生混凝土黏结滑移性能研究
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摘要
黏结滑移性能是再生混凝土技术应用于工程实际的一项重要课题。考虑再生粗骨料取代率(30%、50%、70%)和再生混凝土强度等级(C20、C40)2个参数,制作5组再生混凝土试件进行中心拔出试验。得到不同种类再生混凝土的荷载-滑移曲线,曲线可分为微滑、滑移、劈裂、破碎、残余5个阶段。定义了初始黏结滑移模量E0及峰值黏结滑移割线模量Eu,E0/Eu数值越大,混凝土黏结性能越好。当混凝土强度等级相同,再生粗骨料取代率小于70%时,黏结强度随取代率的增大而增大;当取代率相同,黏结强度随混凝土强度等级增加而增大。基于试验与理论分析,给出了再生粗骨料取代率与极限黏结强度的方程以及黏结滑移本构关系方程,模型结果与试验结果吻合良好。
Bond-slip behavior is an important project of recycled concrete in applying to engineering practice.Considering 2 parameters which are recycled coarse aggregate replacement ratio(30%,50%,70%)and recycled concrete strength grade(C20,C40),5 sets of recycled concrete specimen are made to carry out central pull out test.The load-slip curves of different recycled concrete are recorded and these curve′s trend can be divided into 5 stages micro-slipping,slipping,splitting,crushing and residual.Initial bond slip modulus E_0 and peak bond slip secant modulus Euare defined.The greater the value E_0/E_u,the better the concrete′s bonding performance.When the strength grade of concrete is same and the recycled coarse aggregate replacement ratio is less than 70%,concrete′ s bond strength increase with replacement ratio.When replacement ratio is same,the bond strength increase with strength grade.On the basis of experimental theory analysis,the relation equation of recycled coarse aggregate replacement ratio with bond strength and bond-slip constitutive equation are given.The model result agree well with test result.
Bond-slip behavior is an important project of recycled concrete in applying to engineering practice.Considering 2 parameters which are recycled coarse aggregate replacement ratio(30%,50%,70%)and recycled concrete strength grade(C20,C40),5 sets of recycled concrete specimen are made to carry out central pull out test.The load-slip curves of different recycled concrete are recorded and these curve′s trend can be divided into 5 stages micro-slipping,slipping,splitting,crushing and residual.Initial bond slip modulus E_0 and peak bond slip secant modulus Euare defined.The greater the value E_0/E_u,the better the concrete′s bonding performance.When the strength grade of concrete is same and the recycled coarse aggregate replacement ratio is less than 70%,concrete′ s bond strength increase with replacement ratio.When replacement ratio is same,the bond strength increase with strength grade.On the basis of experimental theory analysis,the relation equation of recycled coarse aggregate replacement ratio with bond strength and bond-slip constitutive equation are given.The model result agree well with test result.
引文
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[3]肖建庄,李丕胜,秦薇.再生混凝土与钢筋间的粘结滑移性能[J].同济大学学报(自然科学版),2006,51(1):13-16.
[4]王晨霞,吴瑾,陈志辉.钢筋与再生混凝土黏结滑移性能的试验研究[J].土木工程学报,2013,46(S2):225-231.
[5]MAMDAL S,GUPTA A.Strength and durability of recycled aggregate concrete[C].IABSSE Symposium Melbourne,Melbourne Australia 2002.
[6]张家兴.再生混凝土多轴压强度试验及破坏准则研究[D].北京:北方工业大学,2015.
[7]何振军,张家兴,杨志安.一种C20、C40、C60级高性能再生混凝土配合比设计方法[D],北京:北方工业大学,2013-05-08.
[8]杜锋,肖建庄,高向玲.钢筋与混凝土间粘结试验方法研究[J].结构工程师,2006,(2):93-97.
[9]郑晓燕,吴胜兴.钢筋混凝土粘结滑移本构关系建立方法的研究[J].四川建筑科学研究,2006,32(1):18-21.
[10]徐有邻,沈文都,汪洪.钢筋砼粘结锚固性能的试验研究[J].建筑结构学报,1994(3):26-37.
[11]杨海峰.再生混凝土受压本构关系及其与钢筋间粘结滑移性能研究[D].南宁:广西大学,2012.
[12]王铮.混凝土高温后力学性能的试验研究[D].大连:大连理工大学,2010.
[13]HARAJI M H.Development/splice strength of reinforcing bars embedded in pail and fiber reinforced concrete[J].ACI Structural Journal,1994,91(5):511.
[14]过镇海.混凝土的强度和变形:试验基础和本构关系[M].北京:清华大学出版社,1997.