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1、學兔兔www.xuetutu.com2012年第12期(總第278期)混凝土理論研究Number12in2012(TotalNo.278)ConcreteTHEoRETICALRESEARCHdoi:10.39698.issn.1002—3550.2012.12.011低膠凝材料用量砂漿及混凝土的流變性能趙海紅,趙小麗。郭夢君,曹峰,吳建華(重慶大學材料科學與工程學院,重慶400045)摘要:在低膠凝材料用量時,研究自流平砂漿流動度與黏度之間的關(guān)系以及增黏劑對砂漿流變性能的影響,并在此基礎上研究增黏劑對自密實混凝土工作性、力學性能的影響。試驗結(jié)果顯示:自
2、流平砂漿擴展度與黏度間具有很好的負相關(guān)性,且兩者圖線關(guān)于某直線對稱;增黏劑(cMc、HPMC和硅灰)降低了砂漿擴展度,但黏度增加,改善了砂漿的泌水狀況;增黏劑對混凝土工作性的影響與砂漿一致,但存在最佳摻量,使混凝土在大流動性時不發(fā)生泌水、離析,提高了其綜合性能;增黏劑適用于有泌水、離析的漿體或拌合物時,能夠改善其工作性,而應用于無泌水漿體時則會顯著降低其流動性。除硅灰具有火山灰活性,能夠提高抗壓強度外,CMC及HPMC對強度的影響無一致定論,總體上對強度影響不大。關(guān)鍵詞:自流平;增黏劑;流動性;黏度;自密實混凝土中圖分類號:TU528.Ol文獻標志碼:A
3、文章編號:1002—3550(2012)12—0030—04RheologicalpropertiesofmortarandconcretewithlowbindercontentZHAOHai-hong,ZHAOXiao—li,GUOMeng-jun,CAOFeng,WUJian-hua(SchoolofMaterialScienceandEngineering,ChongqingUniversity,Chongqing400045,China)Abstract:Thestudywascarriedonwithlowcontentbindersandf
4、ocusesontherelationshipbetweenthefluidityandviscosityofself-levelingmortarandalsotheinfluenceofviscositymodityingadmixturesontherheologicalproperties.Onthatbasis,studiedtheefectofviscositymodifyingadmixturesonthefluidityandmechanicalpropertiesofself-compactingconcrete.Resultsshow
5、edthatithadahighinversecorrelationbetweenthefluidityandviscosityofself-levelingmortar,andalsothetwocurvesweresymmetriccenteredonsomestraightline.viscositymodifyingadmixturesincludingCMC,HPMCandsilicafumedecreasedthefluiditybutincreasedtheviscosityandalsoeliminatedthebleedingofmor
6、tar.Theinfluenceofviscositymodifyingadmixturesontheconcretewassimilartothatofmortar,buttherewasanoptimaldosageforviscositymodilyingadmixturestomaketheconcretecontainingataghfluiditywithoutbleedingorsegregationgettheexcellentintegratedperformance.viscositymodifyingadmixtureswouldi
7、mproveperformanceswhenthemortarormixturewasbleedingorsegregationbutsignificantlydecreasedtheworkabilitywhentheywerenot.TherewasnodefiniteconclusionaboutCMCandHPMCafectingthestrengthofmortarandconcreteexceptthatthesilicafumeincreasedthecompressivestrengthforthepozzolanicactivity,v
8、iscositymodifyingadmixtureshadverylittle