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时间:2019-02-27
《大粒径骨料钢纤维高强混凝土试验研究》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.com第13卷第2期建筑材料学报Vo1.13,No.22010年4月IOURNALOFBUILDINGMATERIALSApr.,2010文章编号:10079629(2010)02—0155~06大粒径骨料钢纤维高强混凝土试验研究赵顺波,李长永,杜晖,钱晓军(华北水利水电学院土木与交通学院,河南郑州450011)摘要:进行了最大粒径为25,31.5mm的连续级配碎石钢纤维高强混凝土试验,研究了碎石粒径、水灰比、钢纤维长度及体积分数对钢纤维混凝土拌和物坍落度和硬化钢纤维混凝土立方体抗压强度、轴心抗压强度、劈裂抗拉强度、弯拉强
2、度的影响规律,并与现行规程CECS38:2004~纤维混凝土结构技术规程》的相关强度计算公式进行了对比.结果表明:钢纤维在混凝土拌和物中的“棚架”效应将产生钢纤维混凝土拌和物坍落度减小的表象,在振动作用下该效应迅速瓦解而对试件成型影响较小;连续级配碎石最大粒径和钢纤维长度对钢纤维混凝土的抗压、劈裂抗拉强度影响较小,但对钢纤维混凝土弯拉强度的增强效果影响较大;可以采用现行规程确定最大粒径为31.5mm的连续级配碎石钢纤维高强混凝土的抗压、劈裂抗拉强度,但弯拉强度的试验值则低于计算值.关键词:钢纤维高强混凝土(SFRHSC);大粒径碎石;坍落度中图分类号:
3、TU528.572文献标志码:Adoi:10.3969/j.issn.1007—9629.2010.02.005StudyofSteel_-FiberReinforcedHigh__StrengthConcreteContainingLargeCoarseAggregateZHA0Shun—bo,LJChang~yong,DUHui,QIANXiao-jUll(SchoolofCivilEngineeringandCommunication,NorthChinaInstituteofWaterConservancyandHydroelectricPow
4、er,Zhengzhou450011,China)Abstract:Testswereconductedtoinvestigatethepropertiesofsteel—fiberreinforcedhigh—strengthconcrete(SFRHSC)containinglargecoarseaggregateincontinuousgradationwithmaximumsizeof25mmand31.5mmrespectively.Themixtureslump,thecubicandaxialcompressivestrength,the
5、splitting—tensileandflexural—tensilestrengthofSFRHSCareanalyzedconsideringthefactorsofthemaximumsizeofcoarseaggregate,thewatertocementratio,thelengthandthevolumefractionofsteelfiber.Thetestresultsarecomparedwiththatcalculatedbycorrespondingformulasspecifiedincurrenttechnicalspec
6、ificationforfi—berreinforcedconcretestructuresCECS38:2004.Itisprovedthattherack—typeeffectofsteelfiberincon—cretemixturecausesthemixtureslumpdecrease,thiseffectisrapidlyweakenandhasnotobviouslyinflu—enceonthevibrationformationofSFRHSC.Thecompressiveandsplitting—tensilestrengthof
7、SFRHSCcontaininglargecoarseaggregateincontinuousgradationwithmaximumsizeof31.5mmarelittleinflu—encedbythemaximumsizeofcoarseaggregateandthesteelfiberlength.Therefore,fortheflexural—ten—silestrength,thecompressiveandsplitting—tensilestrengthcanbedeterminedaccordingtothecurrenttec
8、hnicalspecification.Theexperimentalvalueofflexu
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