改性聚丙烯纤维增强混凝土抗疲劳性能的研究

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1、Y1404973分类号一UDC2密级：学校代号：10150学号：20052006戈童交歌挚硕士学位论文改性聚丙烯纤维增强混凝土抗疲劳性能的研究ResearchonFatiguePerformanceofModifiedPolypropyleneFiberReinforcedConcrete学生姓名：导师及职称：学科门类：专业名称：研究方向：申请学位级别：论文答辩日期：学位授予单位：张伟王生武教授工学工程力学抗疲劳设计硕士2008年6月9日大连交通大学大连交通大学工学硕士学位论文AbstractConcretematerialusewidelyincons

2、tructionprojectbecauseofitsmeritsincludinghighercompressivestrength，betterdurabilityandlowercost．But，asbrittlematerial，concretehasmuchlowertensilestrengthasagainstofitscompressivestrength．Thisperformanceweaknessofconcretehaslimiteditsapplicationscopetogreatextent．Recently，mixingf

3、iberintheconcretehasmadegoodprogressinsolvingthisproblem，especiallypolypropylenefiber，whichofferstheadvantageoflight，corrosionresistance，evenlydistributedandSOon，hasagoodapplicationprospect．Moreover，theresearchofflyashinconcretehasbecomeagreatimportantresearchareainthescienceofce

4、mentandconcretebecausemixesflyashinconcreteCanbringimportantbenefitinmanyaspectssuchastechnology，economy,environment，societyandSOon．Theapplicationscopeofconcretehasexpandedtohighrequestdomainofanti-fatigueandanti-impactalongwithitsapplicationgettingmoreandmorewidespreadincivileng

5、ineering．Theseprojectswithstandstochasticorperiodicloadfrequently，researchoffatigueperformanceofpolypropylenefiberinconcreteandflyashconcreteappearsthegreatimportance．Synthesizedthesituationsabove，thispaperhasselectedakindoffineperformancemodifiedpolypropylenefiberwhichismadeinCh

6、ina，studiedperformanceandfundamentalwhichWasinfluencedonfiberintwodifferentkindsofparentconcrete．Firstly，takingplainconcreteasparentconcrete，studiedstaticintensityandflexuralfatigueperformancewhichWasinfluencedonthevariationoffiberinvolume，establishedtheflexuralfatigueequationofm

7、odifiedpolypropylenefiberinconcrete，searchedtheeffectsruleofflexuralfatigueperformanceandfoundthebestleveloffibersinvolume．Secondly，takingconcretewith20％(bymass)flyashasparentconcrete，furtherstudyhasbeenmadetofindouttheperformanceinfluenceandtheeffectsruleoffiberandflyashinconcre

8、te．Effectsofmodifiedpolypropylenefiberso