- 畢 乾, 張亞梅
2010年第4期
摘要
引用本文
摘??要:采用干濕交替的試驗方法對大摻量礦渣硅酸鹽水泥砂漿的抗硫酸鹽侵蝕性能進行了研究。對侵蝕過程中砂漿的體積膨脹率、質量變化以及強度變化進行了測試,并對侵蝕后的砂漿試件進行了微觀分析。對比不同侵蝕溶液(分別為Na2SO4溶液和MgSO4溶液)中受侵蝕的砂漿試件發現在短時間浸泡、長時間烘干的循環制度下,在鎂鹽中受侵蝕的砂漿試件具有較低的膨脹率和質量變化率,強度下降也較小。電鏡結果顯示在鎂鹽中受侵蝕的砂漿試件形成了大量無膠凝性的物質,而在Na2SO4溶液中受侵蝕的試件表面孔隙中形成了大量膨脹性的針棒狀晶體。Abstract:Thewet-drycyclemethodisusedtoevaluatethesulfateresistanceofcementmortarswithhighvolumeofslag.Volumeexpansionratio,masschangeandstrengthchangeareexaminedtoevaluatethedamageafterthemortarsareimmersedin5%MgSO4solutionorin5%Na2SO4solution.AndSEManalysisistakenfortheerosivemortarspecimens.After60cycleswithshort-timeimmersionandlong-timedrying,thespecimensimmersedin5%MgSO4solutionshowabetterconditioncomparedtothoseimmersedin5%Na2SO4solution.TheSEMphotosshowthatalargeamountofnon-bindingcapacitymaterialshadformedinsidethemortarsimmersedin5%MgSO4solution.However,alotofexpansiveneedleshapedcrystallineisobservedintheporesofthosemortarsimmersedinNa2SO4solution.