掺碱激发剂粉煤灰-水泥混凝土力学性能试验研究

《掺碱激发剂粉煤灰-水泥混凝土力学性能试验研究》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、第12卷第4期南水北调与水利科技Vo1．12No．42014年8月South-to-NorthWaterTransfersandWaterScience＆TechnologyAug．2014DOI：10．1347611．cnki．nsbdqk．2014．04．029掺碱激发剂粉煤灰一水泥混凝土力学性能试验研究刘飞鹏，龚爱民，王良泽南，杨艳玲(1．云南农业大学水利学院，昆明6502012．昆明阳宗海风景名胜区管委会汤池街道办事处，昆明652103)摘要：通过C30混凝土实验室配合比，配制掺3O粉煤灰的粉煤灰一水泥混凝土，在三

2、个实验组中分别掺入最佳掺量的NaOH、水玻璃和CaO，振捣成型，测定碱对流动度和凝结时间的影响，用扫描电镜探求胶砂的微观结构，随后养护至龄期。按照《普通混凝土力学性能试验方法标准》测定混凝土抗压强度和劈拉强度，通过强度比较，算出强度提高率；可以得出掺碱对早期和后期强度发展的影响。结果表明，掺碱能促凝且胶砂流动度减小；掺碱粉煤灰早期强度发展快，后期发展较缓慢，90d强度基本能够满足设计要求；扫描电镜中，由于水泥水化加快，粉煤灰活性得以激发，早期强度得到改善；经济技术效益显著。关键词：粉煤灰；掺碱粉煤灰水泥；碱激发剂；混凝土；

3、力学性能中图分类号：TU528．2文献标志码：A文章编号：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