资源描述：
《超高强微钢纤维增韧混凝土的制备及其力学性能研究(修改)》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、超高强微钢纤维增韧混凝土的制备及其力学性能研究王冲1,LizaO’Moore21:重庆大学材料科学与工程学院，重庆，4000452:DepartmentofCivilEngineering,theUniversityofQueensland,QLD4072,Australia摘要：高脆性是超高强混凝土难以被广泛应用的主要原因之一。为降低脆性，本研究利用长度为6mm与13mm的三种微钢纤维，制备了超高强微钢纤维混凝土，研究了不同纤维长径比及掺量条件下混凝土的力学性能指标，其中包括ASTMC-1018方法
2、测试超高强微纤维混凝土的抗弯韧性。试验结果显示：随纤维掺量的增加，超高强混凝土能量吸收能力增加明显；与不掺纤维时相比，1.0%体积掺量下三种纤维混凝土的初始裂缝强度、抗折强度和韧性指数均有显著提高，掺量2.0%时初始裂缝强度、抗折强度和韧性指数的增加受到影响；长度为6mm的纤维在2.0%掺量时抗压强度相对较大，而长度为13mm的两种纤维在掺量1.0%时抗压强度较高；掺入3种纤维的混凝土劈拉强度和弹性模量也由于纤维的掺入而有所增加。本论文结果表明，微钢纤维用于增韧超高强混凝土时，宜采用适宜掺量。关键词：
3、微钢纤维；超高强混凝土；制备；力学性能中图分类号：TU528.572文献标识码：AResearchonPreparationandMechanicalPropertiesofSuper-highStrengthSteelMicro-fiberToughenedConcreteWangChong1,LizaO’Moore21:CollegeofMaterialsScienceandTechnology,ChongqingUniversity,Chongqing400045,China2:Departme
4、ntofCivilEngineering,theUniversityofQueensland,QLD4072,AustraliaAbstract:Superhighstrengthconcrete(SHSC)isdifficulttobeappliedincivilengineeringwidelybecauseofitshighbrittleness.Theobjectiveofthisresearchistoreducethebrittlenessofsuperhighstrengthconcre
5、tebyaddingsteelmicro-fibersof6mmand13mmlength.Mechanicalpropertiesofconcretewereinvestigatedunderconditionofdifferentaspectratioanddifferentvolume,whichincludingflexuraltoughnessmeasuredbyASTMC1018.ThetestresultsshowthatenergyabsorptioncapabilityofSHSCw
6、ereenhancedwithincreaseoffibervolume.Comparedwithcontrolmix,theeffectivestimprovementofthefirstcrackstrength,flexuralstrengthandtoughnessindexieswereinvestigatedinthecaseof1.0%fibervolume,whichwereclosedtothatof2.0%fibervolume.Abigercompressivestrengtho
7、fSHSCwastestedinthecaseof2.0%volumewhen6mmlengthfiberadded,buthighercompressivevalueweremeasuredundertheconditionof1.0%when13mmfibersadded.TheresultsalsoshowthattensilestrengthandYoung’smodulusofSHSCwereimprovedbyaddingsteelmicro-fiber.Itisconcludedinth
8、isresearchthatareasonablefibervolumeshouldbeappliedwhensteelmicro-fiberareusedtoimprovethetoughnessofSHSC.Keywords:steelmicro-fiber;superhighstrengthconcrete;preparation;mechanicalpropertiesE-mail:wangchnx@126.com前言近20年来超高强混凝土(本文
