废弃混凝土代替天然石灰石煅烧水泥熟料实验.docxVIP

文章编号(2008)0921012206废弃混凝土代替天然石灰石煅烧水泥熟料实验万朝均1,袁启涛1,刘立军1,张廷雷1,刘连川2,李有光1,3(1.重庆大学材料科学与工程学院,重庆400030;2.重庆拉法基瑞安水泥有限公司,重庆400065;3.重庆润江水泥有限公司,重庆404000)摘要:从4个不同地点取得4个以破碎石灰石为粗集料的废弃混凝土样品,破碎、分离,获得以石灰石为主的颗粒,取代天然石灰石作为钙质原料煅烧出4个波特兰水泥熟料样品,并与重庆拉法基水泥厂生产的熟料和市售水泥样品进行对比。研究结果表明:废弃混凝土熟料的4种主要矿物的XRD特征峰明显;游离CaO低于1%;可以用其制备出52.5级硅酸盐水泥。关键词:废弃混凝土;水泥生料;煅烧;水泥熟料;强度;熟料矿物;游离氧化钙中图分类号:TF046文献标志码:AUsingwasteconcreteasareplacementfornaturallimestonetoproducecementclinkerWANChao2jun1,YUANQi2tao1,LIULi2jun1,ZHANGTing2lei1,LIULian2chuan2,LIYou2guang1,3(1.CollegeofMaterialScienceandEngineering,ChongqingUniversity,Chongqing400030,P.R.China;2.ChongqingLafargeShuionCementCo.,Ltd.,Chongqing400065,P.R.China;3.ChongqingRunjiangCementCo.,Ltd.,Chongqing404000,P.R.China)Abstract:Foursamplesofwasteconcretewithcrushedlimestoneascoarseaggregatewerecollectedfromfourdifferentdemolitionsites.Eachsamplewascrushedintoparticleswhichwerethenscreenedbysievestoremovesmallerparticlesofgivensize.Theresiduewasretainedforuse.Mostoftheresiduewasthecrushedlimestone;itwasusedtoreplacenaturallimestoneasthecalcareousrawmaterialtoproducecementclinker.ThesefourclinkersampleswerecomparedwiththesimilarChongqingLafargecementclinkerandsomeselectedPortlandcementsonthemarket.ThecomparisonresultsofXRDindicatedthattheXRDcharacteristicapexofthefourprincipalcompoundsintheusualcementclinkers,C3S,C2S,C3AandC4AF,arestrongenoughintheclinkersproducedbythewasteconcretes.AllthefreeCaOcontentintheclinkersproducedbythewasteconcreteswaslessthan1%,meetingtherequirementofagivenChinesestandard.ItcanbeusedtopreparePortlandcementswithstrengthgradeof52.5.Theexperimentalresultsoffertheoreticalandtechnologicalguidanceforefficientlyreusingwasteconcretes.Keywords:wasteconcrete;cementrawmeal;calcination;cementclinker;strength;clinkercompound;freecalciumoxide收稿日期:2008205215基金项目:重庆市建委科技计划资助项目(城科字2006第(44)号);重庆市科委自然科学基金资助项目(CSTC2005BB4262)作者简介:万朝均(19702),男,重庆大学副教授,博士研究生,主要从事高性能水泥基材料的制备、机理与性能研究,(E2mail)cjwan@cqu.edu.cn。万朝均,等:废弃混凝土代替天然石灰石煅烧水泥熟料实验第9期1013世界上每年因拆除旧建筑产