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ID:36571658
大小:2.75 MB
页数:66页
时间:2019-05-12
《混凝土耐腐蚀外加剂的试验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南交通大学硕士学位论文混凝土耐腐蚀外加剂的试验研究姓名:汤海滨申请学位级别:硕士专业:桥梁与隧道工程指导教师:李固华20070501西南交通大学硕士研究生学位论文第1l页AbstractNowadays.concreteisoneofthemostwildlYusedbuildingmaterialsincivilengineering.Inapoorenvironment,concretehavetobesufferedthedamagefromcorrosivemediumforalongti
2、me,whichdirectlyleadstothecrackofconcrete’sstructure,reduceofimdurability,andfmallydamageoccurredearlierthanpredicted.HowtoimprovethedurabilityifconcretehasbeenahottopicincivilengineeringThetextcompaireandanalysetheflyashandmicro-silicaconcretebytheexp
3、erinaentofcementmortarsulfateresistance,experimentofconcretechloridediffusivityandexperimentofdrying/wettingcycleincorrosiveenvironments.Theexperimentshaverichcontentandlongcycles:experimentofcementmortarsulfateresistancelasted3months,experimentofdryin
4、g/wettingcycleincorrosiveenvironmentsmadel10times.experimentofchloridediffusivity1asted90d.Forimprovetheanti-corrosiveabilityinseawaterandsaltysoil,theauthorityputforwardthemethodofaddinganti-corrosiveadmixtureineonerete.Combiningallkindsofmixed-materi
5、al’sdisplayindurabilityexperimentsandreferstothedomesticandinternationalstudydata,wedeterminedthemaincompositionandocoordinationratioofconcreteanticorrosiveetchingreagent.Wetestedtheabilityofanti.corrosiveadmixturebythe3experimentsabove,andanalysesthea
6、nti—corrosivemechanismoftheanticorrosiveetchingreagent.Thetextanalysesmicroscopicstructureofconcreteaddedfly-ashandmicro.silicabySEM.Comparedmicroscopicstructurechangeofsampleunderwatermaintainsanddrying/wettingcycleincorrosiveenvironments.anddeeplydis
7、cussedtheanti..corrosivemechanismoffly-ashandmicro..silica,alsoexplainedpreviousstudyofsulfateresistanceandchloridediffusivity.Kerword..concrete,anticorrosiveetchingreagent,sulfateresistance,cMoridediffusivity,drying/wettingcycleincorrosiveenvironments
8、西南交通大学硕士研究生学位论文第1页第1章绪论1.1课题背景一混凝土结构耐久性的问题所谓混凝土的耐久性,是指混凝土结构在自然环境、使用环境及材料内部因素的作用下,在设计要求的目标使用期内,不需要花费大量资金加固处理而保持其安全、使用功能和外观要求的能力【”。建筑结构是建筑物的主要骨架,而结构的物质基础是建筑材料。建筑结构的优化和发展不断促进建筑材料的更新和发展。混凝土是近现代最广泛使用的建筑材料,也是当前最大宗的人造材料。进入20世纪以来,以混凝土为建筑材料的工程结构
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