混凝土硫酸盐侵蚀抑制措施及其机理研究

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1、西南交通大学硕士学位论文混凝土硫酸盐侵蚀抑制措施及其机理研究姓名：高立强申请学位级别：硕士专业：桥梁与隧道工程指导教师：李固华20080401西南交通大学硕士研究生学位论文第1I页AbstractTherearetwoformsofsulfateattackforconcretecorrosion．theyarephysicalcrystalattackandchemicalcrystalattack．Physicalcrystalattackmeansthatwhenthetensilestressasaresultof

2、crystalofsaltintheinterspaceofconcreteexceedstheultimatetensilestressofconcrete，theconcretewillcrack，whichOfienoccursattheconcretebetweenthewaterandair．ChemicalcrystalaRackconsistsgypsumattackandwollastoniteattack．thevolumesofthesesubstanceare1argethantheoriginals

3、ubstance，theybringtensilestresswhichexceedstheultimatetensilestressofconcrete，SOtheconcretecracks．Theresistancetosulfateattackofgelmaterialanditscompactnessarethemosttwoimportancefactorsfortheresistancetosulfateattackofconcrete，SOwhenwewanttorestrainsulfateattacko

4、fconcrete，thesetwofactorsmustbetakenintoaccountfirstofa11．ThisresearchreliesonscientificresearchprojectofChinaRailwayEighthCivilEngineeringGroup．Inthisresearch，weusetwosulfateattackrestrainingmeasureswhichareflyashandpreservatives，andweusemanytestmethodstoevaluate

5、restrainingeffecttosulfateattackofthesetwosulfateattackrestrainingmeasures．Thesemethodsevaluatetherestrainingeffecttosulfateattackofconcreterespectivelyfromimprovementoftheperformanceoftheresistancetosulfateattackofthegelmaterial．improvementofcompactnessofconcrete

6、andimprovementoftheperformanceoftheresistancetosulfateattackoftheconcrete。Outcomeoftestindicate：flyashandpreservativesimprovetheperformanceoftheresistancetosulfateattackofthegelmaterial，thecompactnessofconcreteandtheperformanceoftheresistancetosulfateattackofconcr

7、ete．andevenmorethe109icalmixingratio(mass)offlyashisabout20％，andthelogicalmixingratio(mass)ofpreservativesisabout2％．Nowtherearenonationalstandardabouttestandevaluateoftheresistancetosulfateattackofconcrete．Butdrying—wettingcyclesmethodisputforwardwhenGBJ82．**

8、dardTestMethodofLongtelmPerformanceandDurabilityofOrdinaryConcrete>arerecensed．Drying—wettingcyclesmethodisaveryeffectivemethodfortheevaluationoftheresi