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时间:2019-02-04
《废弃纤维再生混凝土的本构关系》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com2013年第2期(总第280期)混凝土原材料及辅助物料Number2in2013(TotalNo.280)ConcreteMATERIALANDADMINICLEdoi:10.3969~.issn.1002—3550.2013.02.015废弃纤维再生混凝土的本构关系周静海la,刘丹伯,董健飞(1.沈阳建筑大学a.建筑节能研究院;b.土木工程学院,辽宁沈阳110168;2.辽宁冶金基础工程研究院,辽宁鞍山i14000)摘要:为了研究废弃纤维体积掺量和长度、再生骨料掺人量及水灰比对废弃
2、纤维再生混凝土力学性能的影响,采用棱柱体试件与刚性元件组合的方法,测定了废弃纤维再生混凝土的应力一应变全曲线。试验表明:废弃纤维可以明显提高再生混凝土的轴心抗压强度。废弃纤维再生混凝土的峰值应变随着水灰比、废弃纤维长度、废弃纤维体积掺量和再生骨料掺量的增加而增大;峰值应力随着水灰比和再生骨料掺入量的增加而减小。当废弃纤维长度为19111l"I1、体积掺量为0.16%g~,轴心抗压强度相对于普通再生混凝土的提高幅度最大。废弃纤维再生混凝土的应力一应变曲线分为上升段和下降段,通过拟合相关参数,提出了应力一应变全曲线方程用分
3、段有理分式表达,拟合结果与试验数据较吻合。关键词:废弃纤维再生混凝土;应力一应变全曲线;轴心抗压强度;峰值应变中图分类号:TU528.04文献标志码:A文章编号:1002—3550(2013)02—0054—05ConstitutiverelationofwastefiberrecycledconcreteZHOUJing-hailaL/UDan,DONGJian·fei(1a.DepartmentofScienceandTechnology;b.SchoolofCivilEngineering,ShenyangJia
4、nzhuUniversity,Shenyang110168,China;2.ResearchInstituteofLiaoningMetallurgicalEngineering,Anshan114000,China)Abstract:Itfocusedonthedeterminationofthestressforthewastefiberrecycledconcrete-strainful1curve.thepurposeofwhichwastostudythevolumeparameterandthelength
5、ofwasterfibers,theincorporationofrecycledaggregate,andtheeffectonthemechanicalpropertyofthecontrastofthewatercementforthewastefiberrecycledconcreteaswellbymeansofthecombinationofprismspecimensandrigidelements.Theresultofthestudyshowedthatwastefibercouldobviously
6、improvetheaxiscompressivestrengthofrecycledcon—crete.Thepeakstrainofwastefiberrecycledconcreteincreasedwiththeincreaseofthewatercementratio,thewastefiberlength,thewastefibervolumeparameter,andtheincorporationofrecycledaggregate.Meanwhile,thepeakstressdecreasedwi
7、ththeincreaseofthewatercementratioandtherecycledaggregate.Whenthewastefiberlengthwas19mmandvolumeparameterwas0.16%.theaxialcorn—pressivestrengthgottothemaximalincreaserelatedtothenormalrecycledconcrete.Thestressforthewastefiberrecycledconcrete—strainfullcurvewas
8、dividedintoascendinganddescendingsegment.Byfittingsomerelatedparameters,itputforwardtothepiecewiserationalfractionalexpressionofthestress—straincurveequation.Intheend
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