- 張江濤,王棟民,王奕仁,李文平,李端樂,張 雷
2016年第8期
摘要
引用本文
摘??要:試驗以非晶態鋁酸鈣為主要礦相、復合Na2SO4、CaSO4·2H2O、NaAlO2等物質,制備了一種低堿高性能粉體速凝劑。通過正交試驗和極差分析研究了四種物質復配對水泥凈漿凝結時間的影響,通過正交試驗結果得出最優配比為67%非晶態鋁酸鈣、18%Na2SO4、8%CaSO4·2H2O、6.2%NaAlO2。新型速凝劑在水泥中的摻量為3.5%~5%時,其各項指標均滿足JC477—2005標準中合格品的要求;當摻量為3.5%~4.5%時,新型速凝劑的各項指標均滿足JC477—2005標準中一等品的要求。新型速凝劑摻量為4%,水泥初凝時間為2min26s,終凝時間為4min55s,1d抗壓強度19.1MPa,28d抗壓強度比為90%。Abstract:Anewtypeoflowalkalihigh-performancepowderacceleratorwassynthesizedbytheorganiccomplexofusingamorphouscalciumaluminate,Na2SO4,CaSO4·2H2OandNaAlO2.Thispaperwasstudiedbyorthogonalexperimentandrangeanalysisoffoursubstancesafterinvestigatingtheinfluenceofthecementsettingtime.Theresultsshowthattheoptimummixproportionis67%amorphouscalciumaluminate,18%Na2SO4,8%CaSO4·2H2Oand6.2%NaAlO2.Thedosageofnewaccleratorincementis3.5%~5%,eachindexofpropertiesmeetstherequirementsofJC477—2005standard.TheinitialsettingtimeandfinalsettingtimeofthePortlandcementaddedwith4%acceleratorareremarkableshortenedto2min26sand4min55srespectively,andthe1dcompressivestrengthreaches19.1MPa;meanwhileitprovidesashighas90%retentionof28dcompressivestrength.