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1、-超高強微鋼纖維增韌混凝土的制備及其力學性能研究王沖1,LizaO’Moore21:重慶大學材料科學與工程學院，重慶，4000452:DepartmentofCivilEngineering,theUniversityofQueensland,QLD4072,Australia摘要：高脆性是超高強混凝土難以被廣泛應用的主要原因之一。為降低脆性，本研究利用長度為6mm與13mm的三種微鋼纖維，制備了超高強微鋼纖維混凝土，研究了不同纖維長徑比及摻量條件下混凝土的力學性能指標，其中包括ASTMC-1018方法測試超高強微纖維混凝土的抗彎韌性。試驗結(jié)果顯示：隨纖維摻量的增加，超高強混凝土能量吸收能力增
2、加明顯；與不摻纖維時相比，1.0%體積摻量下三種纖維混凝土的初始裂縫強度、抗折強度和韌性指數(shù)均有顯著提高，摻量2.0%時初始裂縫強度、抗折強度和韌性指數(shù)的增加受到影響；長度為6mm的纖維在2.0%摻量時抗壓強度相對較大，而長度為13mm的兩種纖維在摻量1.0%時抗壓強度較高；摻入3種纖維的混凝土劈拉強度和彈性模量也由于纖維的摻入而有所增加。本論文結(jié)果表明，微鋼纖維用于增韌超高強混凝土時，宜采用適宜摻量。關(guān)鍵詞：微鋼纖維；超高強混凝土；制備；力學性能中圖分類號：TU528.572文獻標識碼：AResearchonPreparationandMechanicalPropertiesofSuper-
3、highStrengthSteelMicro-fiberToughenedConcreteWangChong1,LizaO’Moore21:CollegeofMaterialsScienceandTechnology,ChongqingUniversity,Chongqing400045,China2:DepartmentofCivilEngineering,theUniversityofQueensland,QLD4072,AustraliaAbstract:Superhighstrengthconcrete(SHSC)isdifficulttobeappliedincivilenginee
4、ringwidelybecauseofitshighbrittleness.Theobjectiveofthisresearchistoreducethebrittlenessofsuperhighstrengthconcretebyaddingsteelmicro-fibersof6mmand13mmlength.Mechanicalpropertiesofconcretewereinvestigatedunderconditionofdifferentaspectratioanddifferentvolume,whichincludingflexuraltoughnessmeasuredb
5、yASTMC1018.ThetestresultsshowthatenergyabsorptioncapabilityofSHSCwereenhancedwithincreaseoffibervolume.Comparedwithcontrolmix,theeffectivestimprovementofthefirstcrackstrength,flexuralstrengthandtoughnessindexieswereinvestigatedinthecaseof1.0%fibervolume,whichwereclosedtothatof2.0%fibervolume.Abigerc
6、ompressivestrengthofSHSCwastestedinthecaseof2.0%volumewhen6mmlengthfiberadded,buthighercompressivevalueweremeasuredundertheconditionof1.0%when13mmfibersadded.TheresultsalsoshowthattensilestrengthandYoung’smodulusofSHSCwereimprovedbyaddingsteelmicro-fiber.Itisconcludedinthisresearchthatareasonablefib
7、ervolumeshouldbeappliedwhensteelmicro-fiberareusedtoimprovethetoughnessofSHSC.Keywords:steelmicro-fiber;superhighstrengthconcrete;preparation;mechanicalpropertiesE-mail:wangchnx@126.com.---.---前言近20年來
