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1、第12卷第4期南水北調(diào)與水利科技Vo1．12No．42014年8月South-to-NorthWaterTransfersandWaterScience＆TechnologyAug．2014DOI：10．1347611．cnki．nsbdqk．2014．04．029摻堿激發(fā)劑粉煤灰一水泥混凝土力學(xué)性能試驗研究劉飛鵬，龔愛民，王良澤南，楊艷玲(1．云南農(nóng)業(yè)大學(xué)水利學(xué)院，昆明6502012．昆明陽宗海風(fēng)景名勝區(qū)管委會湯池街道辦事處，昆明652103)摘要：通過C30混凝土實驗室配合比，配制摻3O粉煤灰的粉煤灰一水泥混凝土，在三
2、個實驗組中分別摻入最佳摻量的NaOH、水玻璃和CaO，振搗成型，測定堿對流動度和凝結(jié)時間的影響，用掃描電鏡探求膠砂的微觀結(jié)構(gòu)，隨后養(yǎng)護(hù)至齡期。按照《普通混凝土力學(xué)性能試驗方法標(biāo)準(zhǔn)》測定混凝土抗壓強度和劈拉強度，通過強度比較，算出強度提高率；可以得出摻堿對早期和后期強度發(fā)展的影響。結(jié)果表明，摻堿能促凝且膠砂流動度減??；摻堿粉煤灰早期強度發(fā)展快，后期發(fā)展較緩慢，90d強度基本能夠滿足設(shè)計要求；掃描電鏡中，由于水泥水化加快，粉煤灰活性得以激發(fā)，早期強度得到改善；經(jīng)濟(jì)技術(shù)效益顯著。關(guān)鍵詞：粉煤灰；摻堿粉煤灰水泥；堿激發(fā)劑；混凝土；
3、力學(xué)性能中圖分類號：TU528．2文獻(xiàn)標(biāo)志碼：A文章編號：1672—1683(2014)04—0134—04MechanicalPerformaneeTestofFlyAsh—CementConcreteMixedwithAlkaliExcitantLIUF_ei—peng，GONGAi-ming，WANGLiang-z~nan，YANGYan-linge(1．CollegeofWaterConservancy，YunnanAgriculturalUniversity，Kunming650201，China2．Tangch
4、iStreetAgencyofKunmingYangzonghaiScenicAreaManagementCommittee，Kunming652103，China)Abstract：BasedonthelaboratorymixratioofC30concrete，theflyash-cementconcretewasmixedwith30flyashtomakethreeexperimentalgroupswhichwerealsomixedwiththebestdosagesofNaOH，sodiumsilicate
5、，andCaO，respectively．Aftervibrationmolding，theimpactsofalkalionthemobilityandsettingtimeweredetermined．Themicrostructureofmortarwasin—vestigatedusingthescanningelectronmicroscope，andthenthesamplesweremaintainedtoage．Accordingtothe(Standardfortestmethodofmechanical
6、propertiesonordinaryconcrete~，thecompressivestrengthandsplittingtensilestrengthofthecon—creteweremeasured．Throughthecomparisonofstrengths，theintensityincreasingratewasdetermined，whichcanhelpunder-standtheimpactsofmixingalkalionthestrengthdevelopmentintheearlyandla
7、tetimes．Theresultsshowedthat(1)mixingwithalkalicancoagulateanddecreasethemobilityofmortar；(2)theflyashmixedwithalkalihasarapidstrengthdevelopmentintheearlytimeandaslowstrengthdevelopmentinthelatetime，andthestrengthat90dayscanmeetthedesignrequire-ments；(3)Inthescan
8、ningelectronmicroscopeexperiment，duetothequickcementhydrationspeed，theactivityofflyashmoti-vates，andSOthestrengthintheearlytimeimproves；and(4)theeconomi
