硫酸鹽侵蝕作用下低熱水泥漿體退化行為研究

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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

硫酸鹽侵蝕是指外部硫酸根離子侵入到水泥基體并與其發(fā)生化學(xué)反應(yīng)，生成石膏、鈣礬石等膨脹性產(chǎn)物，進(jìn)而導(dǎo)致混凝土開裂以及承載能力下降的現(xiàn)象[1]。（剩余5962字）