复合型混凝土掺和料的配制及其特性研究

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1、摘要本文主要将磨细钢渣粉、粉煤灰及硅灰按照不同形式的组合，形成满足复合型混凝土使用要求的掺和料；研究结果对实现矿物掺和料的产品化、降低混凝土生产成本、减少工业废渣对环境的污染具有一定的价值。以掺复合型掺和料的水泥胶砂强度、耐久性和微观分析为主要试验内容，研究了掺复合型掺和料的水泥胶砂的抗折抗压强度、抗碳化性能和抗冻融性能的规律和孔径分布、微观结构组成等，并与纯水泥胶砂各项性能进行比较，通过实验室试验，得出以下结论：(1)在适当的水胶比时，掺磨细钢渣粉35％、掺优质粉煤灰27．5％、掺硅灰2％～11％、掺钢渣粉硅灰40％、掺钢渣粉与粉煤灰40％、掺粉煤灰与硅

2、灰70％及三掺复合掺和料40％时的水泥胶砂都具有良好流动性，抗折抗压强度都满足42．5级水泥的要求。(2)研究了掺复合型掺和料的水泥胶砂抗碳化和抗冻融等耐久性。发现双掺、三掺掺和料的水泥胶砂抗冻等级能达到150级；28天碳化深度，除复掺钢渣粉与粉煤灰的掺和料的水泥胶砂大于20ram，其他各种情况下都小于20mm。(3)通过压汞试验和扫描电镜检测，得到了掺复合型掺和料的水泥胶砂的孔径分布和微观结构组成。(4)根据掺复合型掺和料的水泥胶砂力学性能、耐久性和微观结构组成分析结果，提出复合型矿物掺和料的配制。关键词：矿物掺和料；配制；胶砂强度；胶砂耐久性；微观分析

3、ResearchontheAdmixturePreparationandPropertiesofCompositeConcreteAbstractThisarticlemainlycompoundsteelslagpowder，flyashandsilicafume晰mdifferentforms，theadmixturemustmeettocomplexconcreteusation；Theresearchresulthaveacertainvaluetomineraladmixtureproducts，reducethecostofproduction

4、onconcrete，andreducetheindustrialwastepollutionoftheenvironment．Thisarticlehavemainlywithcompositeadmixturecementmortarstrength，durabilityandmicro-analysisofthecontents．Majortestedstudyaretheflexuralandcompressivestrength,theanti-carbonationpropertiesandtheanti-freezelaw,theporesi

5、zedistribution，micro-structureofthecompositeadmixturecementmortar,furthermore．、析mthepurecementmortartocomparetheperformance．Somepointsareasfollow：(1)Attheappropriatewater-cementratio，mixingfinepowderofsteelslag35％，mixinglligh-qualityflyash27．5％，mixingsilicafume2％～11％，mixingsteelpo

6、wderandsilicafume40％，mixingflyashandpowderofsteelslag40％，mixingflyashandsilicafume70％，mixingthethreeminerals40％，theadmixtureofthecementmortarsarehavethegoodmobilities，flexuralandcompressivestrengthofcementtomeettherequirementsof42．5．(2)Throughthestudyofthecompositeadmixturecementm

7、ortartoanti-carbonationandanti·freezedurabilitylaws．Foundthatdoubleandthreecompoundmixingcementmortarantifreezinglevelachieved150；28daysofcarbonationdepth,inadditiontosteelslagpowderadmixtureandflyashcementmortarmorethan20mm，avarietyoftheotherscircumstancesarelessthan20mm．(3)Throu

8、ghthepressureofmercurytestingands