硫酸盐侵蚀作用下低热水泥浆体退化行为研究

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CHEN ，JIANG Chunmeng1，2，LI Shuangxi1，2，WANG Bei1

（1. College of Hydraulic and Civil Engineering，Xinjiang Agricultural University，Urumqi 830o52，China； . Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention， Urumqi 830O52，China） Abstract：Lowheatportlandcementiswidelyappliedinhydraulicconcrete，wheremuchatentionshouldbepaidtoitsperfoanceof sulfateattack.Inthispaper，theevolutionlawsofphysicalandmechanicalpropertiessuchasporosity，sulfateiondistriution， expansionrate，compresivestrengthandVickershardnesofloweatcement-basedpasteswredetemedthroughthefullimesion testofsodiumsulfatesolution，aswellasthecomparedordinarycementpastes.Basedonwhich，theirsulfateatackdeterioration behavioranddamagemechanismwerealsoanalyzed.Resultsshowthatcomparedwithordinaryportlandcement，lowheatcementhas better resistance to sodium sulfate attack，and adding 30% flyash could also improve its anti-corrosion performance.The corrosion sectionoflowheatcementpastecanbedivided intodegradedzone，strengthenedzone，ingresivezone，andsoundzonefromthe surface totheinside.Vickers hardnesscouldbetercharacterizethe time-varying behaviorofcementpasteundersulfateatack.

Keywords：sulfate atack；low heat cement；ion concentration；Vickers hardness；deterioration behavior

0引言

硫酸盐侵蚀是指外部硫酸根离子侵入到水泥基体并与其发生化学反应，生成石膏、钙矾石等膨胀性产物，进而导致混凝土开裂以及承载能力下降的现象[1]。（剩余5962字）