您好,欢迎访问三七文档
河南城建学院本科毕业论文摘要I摘要辅助性胶凝材料可以分为活性辅助性胶凝材料和惰性辅助性胶凝材料,活性材料主要包括硅灰、粒化高炉矿渣;惰性材料主要包括粉煤灰、石灰石和煤矸石。砖粉的化学成分中主要为SiO2和Al2O3,由水泥的水化机理可知SiO2和Al2O3为主要活性化学成分。从化学组分上砖粉与粉煤灰相同,粉煤灰可以作为辅助性胶凝材料,理论上砖粉同样可以作为辅助性胶凝材料。本文以废弃的红色粘土砖为主要原料,分析不同粒径的砖粉与不同掺量的砖粉替代水泥制备水泥砂浆研究水泥砂浆强度的变化,得出最佳粒径和掺量,通过化学改性后的砖粉替代水泥研究砂浆强度的变化。研究结果表明相同的取代率下,水泥砂浆强度随着砖粉粒径的增大而减小;在相同的粒径下,水泥砂浆强度随着砖粉取代率的增大而减小;通过石灰粉改性后可以部分提高砂浆试块早期强度;氯化钙改性后可以部分提高整个砂浆试块的强度。关键字:辅助性胶凝材料,粘土砖粉,强度,石灰粉,氯化钙河南城建学院本科毕业论文AbstractIIAbstractSupplementaryCementitiousMaterialscanbedividedintohelperactivityofcementitiousmaterialsandauxiliaryinertplasticcementitiousmaterials,activematerialsincludingsilicafumeandgranulatedblastfurnaceslag;inertmaterialsincludingflyash,limestoneandcoalgangue.ThechemicalconstituentsofthebrickpowderwereAl2O3andSiO2,andthehydrationmechanismofthecementwasAl2O3andSiO2.Fromthechemicalcompositionofbrickpowderandflyash,flyashcanbeusedasauxiliarycementitiousmaterial,andcanbeusedasSupplementaryCementitiousMaterialintheory.Theabandonedredclaybricksasthemainrawmaterialofbrickpowderofdifferentparticlesizeofbrickpowderwithdifferentdosageofreplacementofcementcementmortarstrengthchanges,drawtheoptimumparticlesizeanddosageof,throughchemicalmodificationofbrickpowderinsteadofcementmortarstrengthchanges.Inthesamesubstitutionrateandstrengthofcementmortarwithbrickpowderparticlesizeincreasesanddecreases;inthesameparticlesize,strengthofcementmortarwithbrickpowderinsteadofrateincreasesanddecreases;throughthelimepowdermodifiedcanimprovemortarearlystrength;calciumchloridemodifiedcanpartiallyimprovethemortartestblockstrength.Keywords:auxiliarycementitiousmaterial,claybrickpowder,strength,limepowder,calciumchloride河南城建学院本科毕业论文目录III目录摘要...........................................................................................................................IAbstract.....................................................................................................................II1绪论........................................................................................................................11.1课题的研究背景及意义.............................................................................11.2概述.............................................................................................................21.3国内外研究现状.........................................................................................21.3.1国内研究现状..................................................................................21.3.2国外研究现状..................................................................................41.4研究内容.....................................................................................................42实验材料与实验方法............................................................................................62.1实验材料.....................................................................................................62.1.1砖粉..................................................................................................62.1.2水泥..................................................................................................62.1.3砂......................................................................................................62.1.4氯化钙..............................................................................................62.2实验仪器.....................................................................................................72.3实验方法.....................................................................................................72.3.1砖粉制备的工艺流程......................................................................72.3.2废砖粉水泥砂浆成型工艺..............................................................83实验结果与分析....................................................................................................93.1不同掺量与不同粒径砖粉对砂浆强度的影响.........................................93.2化学改性后对砂浆强度的影响...............................................................123.2.1石灰改性........................................................................................123.2.2氯化钙改性....................................................................................20结论.........................................................................................................................29参考文献.................................................................................................................30致谢.........................................................................................................................32河南城建学院本科毕业论文绪论11绪论1.1课题的研究背景及意义近来国内建筑行业的快速发展,混凝土、水泥等建筑材料一路增长。根据调查,11年国内的水泥产量为20.85亿吨,在整个世界水泥行业内位列前茅。但是在水泥发展迅猛的同时造成了能源浪费和环境的严重污染。经长期调查研究,每生产1吨水泥需要1.7吨生料,其中包括耗约标准煤120千克,而污染更严重向大气排放约0.75~1吨CO2气体,1千克的SO2气体,大型规模的水泥厂每产生1吨水泥就会产生3~7千克的粉尘,小型的水泥厂则会更多[1]。生产水泥产生的CO2、SO2和粉尘严重污染环境和直接危害到人们的身体健康,同时消耗大量的煤能源。从能源消耗、环境和人民健康等问题考虑,寻找水泥的替代品必不可少。当然还有一个制约水泥快速发展的重要因素,那就是生产水泥的原料—石灰石和黏土,由于这两种原料属于不可再生资源国内的石灰岩数量有限,随着这几年的开采黏土资源的量也迅速降低,因此寻找替代水泥原料的材料势在必行。随着城乡一体化的建设和旧城改造,建筑业蓬勃发展每天都有旧建筑物拆除,建筑垃圾日益增多。据调查,截至2011年国内建筑垃圾高达21亿~28亿吨[2],而废弃的粘土砖占其中的比例约为50%~70%[3]。加上生
本文标题:党荣亮论文03版
链接地址:https://www.777doc.com/doc-2650273 .html