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1、2017年第8期(總第334期)混凝土理論研究Number8in2017(TotalNo.334)ConcreteTHEORETICALRESEARCHdoi:10.3969/j.issn.1002-3550.2017.08.009水灰比對(duì)無機(jī)聚合物膠凝材料漿體流變性能的影響佘俊輝1,詹鎮(zhèn)峰1,李兆恒1,2,3,楊永民1,2,3,謝亮1,彭鴻濤1(1.廣州大學(xué)土木工程學(xué)院,廣東廣州510006;2.廣東省水利水電科學(xué)研究院,廣東廣州510635;3.廣東省水利重點(diǎn)科研基地,廣東廣州510635)摘要
2、:采用RS-SST流變儀研究在不同水灰比條件下,無機(jī)聚合物膠凝材料漿體各剪切速率下的剪切應(yīng)力和塑性黏度變化規(guī)律,采用H-B流變模型對(duì)流變曲線進(jìn)行擬合,獲得流變參數(shù)剪切屈服應(yīng)力、塑性黏度系數(shù)和流變指數(shù),用觸變環(huán)面積表征漿體的觸變性和凈漿流動(dòng)度表征漿體的流動(dòng)性能。結(jié)果表明:(1)無機(jī)聚合物具有初始流動(dòng)度大和凝結(jié)硬化快的特點(diǎn),水灰比與其初始流動(dòng)度具有良好的線性關(guān)系;(2)無機(jī)聚合物漿體的流變性能夠較好符合H-B流變模型,相關(guān)系數(shù)達(dá)0.999以上,該流體為脹流性流體,其剪切增稠程度隨水灰比的增大而增強(qiáng);(3
3、)隨著水灰比的增加,漿體剪切屈服應(yīng)力先增加后降低;塑性黏度系數(shù)逐漸降低并趨于穩(wěn)定;漿體觸變環(huán)面積逐漸降低;(4)在本試驗(yàn)中,水灰比為0.4的無機(jī)聚合物漿體工作性能較好。關(guān)鍵詞:無機(jī)聚合物;水灰比;流變性能中圖分類號(hào):TU528.002文獻(xiàn)標(biāo)志碼:A文章編號(hào):1002-3550(2017)08-0037-05EffectsofwatertocementratioontherheologicalpropertyofgeopolymerpastesSHEJunhui1,ZHANZhenfeng1,LIZh
4、aoheng1,2,3,YANGYongmin1,2,3,XIELiang1,PENGHongtao1(1.SchoolofCivilEngineering,GuangzhouUniversity,Guangzhou510006,China;2.GuangdongResearchInstituteofWaterResourcesandHydropower,Guangzhou510635,China;3.GuangdongProvincialKeyScientificResearchBase,Guan
5、gzhou510635,China)Abstract:TheshearstressandplasticviscosityofgeopolymerpastesweremeasuredbyRS-SSTrheometer.TherheologicalpropertiesofthepasteswerecharacterizedbyusingtheH-Brheologicalmodeltoobtaintheshearyieldstress,plasticviscositycoefficientandrheol
6、ogicalindex,andthethixotropyofthepastewerecharacterizedbytheareaofthixotropicloopandthefluidityofthepaste.Theresultsindicatedthat(1)thegeopolymerhasthecharacteristicsofhighinitialfluidityandrapidhardeningandearlystrength,andthewater-cementratiohasagood
7、linearrelationshipwiththeinitialfluidity.(2)TherheologicalpropertiesofthegeopolymerpasteswellconformedtotheH-Brheologicalmodelwithacorrelationcoefficientof0.999above,whichisabulgingfluid,anditsshearthickeningdegreeincreasedwiththeincreaseofwater-cement
8、ratio.(3)Withtheincreaseofwater-cementratio,theshearyieldstressofthepasteincreasedfirstandthendecreased;theplasticviscositycoefficientdecreasedandtendedtobestable;theareaofthethixotropicloopdecreasedgradually.(4)Inthisexperiment,thewate