高强轻质粉煤灰加气混凝土发气技术的研究

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1、学兔兔www.xuetutu.com2012年第1期(总第267期)混凝土实用技术Number1in2012(TomlNo．267)ConcretePRACTICALTECHNOLOGYdoi：10．3969／j．issn．1002-3550．2012．01．043高强轻质粉煤灰加气混凝土发气技术的研究黄照明。袁誉飞1I。，陈泽杰。文梓芸’(1．华南理工大学材料科学与工程学院，广东广州510640；2．中山诚盛建材开发有限公司，广东中山528400；3．广州市市政工程维修处，广东广州510100)摘要：为了制备高强轻质(B07．A7．5)加气混凝土，重要条件是实现的低水

2、料比下的引气技术，研究水料比低至0．25时加气混凝土拌合物的流变学参数、初始扩展度、稠化速率、与发气高度、发气速率的关系和对发气质量和性能的影响。发现随着水料比的降低，加气混凝土用基本浆体的屈服值降低，但是塑性黏度增大，触变值增大。当水料比较低至0．30以后，浆体出现剪切变稠现象；水料比越低，浆体稠化越快。试验表明，在水料比为0．25时，一定配合比下，加气混凝土初始扩展度宜控制在190mm左右；可以在在30min内完成发气并实现料浆发气与稠化匹配，制备出符合要求产品。关键词：加气混凝土；高强轻质；低水料比；发气技术；流变性中图分类号：TU528．2文献标志码：A文章编号

3、：1002—3550(2012)01—0135—03Researchontheair—entrainingtechnologyofhigh-strengthandlightweightflyashaeratedconcreteHUANGZhao-ming，YUANYu—fei，CHENZe-jic，WENZi-yun(1．SchoolofMaterialScienceandEngineering；SouthChinaUniversityofTechnology，Guangzhou510640，China2．ZhongshanChengshengBuildingMater

4、ialsDevelopmentCo．，Ltd．，Zhongshan528400，China；3．GuangzhouMunicipalEngineeringMaintenanceDepartment，Guangzhou510100，China)Abstract：Formanufacturinghigh—strengthandlightweightaeratedconcrete(B07一A7．5／GB)，theair-entrainingtechnologyinthepasteoflowwater-to-materialsratio(W／M)isoneoftheimport

5、anceprocessconditions．Studiedtherelationshipbetweenrheologicalparameters，initialextension，consistencyspeedandtheair-entrainingheightorrateoftheaeratedconcreteslurry，aswellastheinfluenceoftheseonthequalityandperformanceoftheaeratedconcreteproduct．ItisdemonstratedthatlowertheW／Mis，thelower

6、theyieldstressofaeratedconcreteslurryis，butthehighertheplasticviscosityandthethixotropicvalueare．WhenW／Mratioislowerthan0．30．aeratedconcretepasteappearsdilatantfluidphenomenonandhigherair-entrainingspeedwithdeceasingoftheW／Mratio．Andthestudyshowedthat．whentheW／Mratiowas0．25andtheinitiale

7、xtensionwascontrolledinarotmd190rnnl，air—entrainingprocesscouldbefinishedinabout30minutesandtheconsistencyandair·entrainingcouldbematchedwelleachother．So，theaeratedconcreteproductwithB07一A7．5／GBpassmusterwouldbeobtained．Keywords：aeratedconcrete；high—strengthandlightweight