掺纳米白炭黑对新拌和硬化水泥基材料性能的影响

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1、掺纳米白炭黑对新拌和硬化水泥基材料性能的影响杜祥飞I,孔德玉I,苑克江2,王建东1仁浙江工业大学建筑工程学院，浙江杭州3100322•天津市建筑材料腔股)有限公司.天津300051)摘要：通过TEM.SEM,BET和激光粒度分析测试，对比研究了沉淀法纳米白炭黑precipitatedsilicaPS)与纳米SiCh微粉i^ano-silicapowder.NS)的纳米特性及其团聚特性，并通过流变、凝结时间、强度和氯离子渗透深度测定，研究了掺PS和NS对新拌和硬化水泥基材料性能的影响及机理.结果表明卩S的团聚程度远大于NS，未经球磨分散处理时呈双峰粒度分布，团聚颗粒粒径很大，Dso和Dgo

2、分别高达58.187Jjm和105.326"，大大超过52.5水泥的颗粒粒度.NS掺量低于1.0%时对水泥净浆稠度影响不大，但PS掺量对净浆稠度有明显影响，低于0.75%时缓慢增长，超过1%时则明显增大.掺PS和NS均可促进水泥水化，在1.0%掺量范围内.随PS掺量增加，水泥砂浆的强度和抗氯离子渗透性能均可得以有效改善.尖键词：白炭黑纳米SiO2流变性能抗氯离子渗透中图分类号:TU528文献标志码：A文章编号1006-4303^012)03-0308-05Effectofprecipitatedsilicaonpropertiesoffreshandhardenedcement・base

3、dmaterialsDUXiang-feiKONGDe-yu1.YUANKe-jiang2.WANGJian-dong1CollegeofCivilEngineering&ArchitectureZhejiangUniversityofTechnology，Hangzhou310032・China:2.TianjinBuildingMaterialsCo.>Ltd.,Tianjin300051、China)Abstract:NanoscaleandagglomerationpropertiesofprecipitatedsilicaPS)andnanosilicapowderNS)we

4、restudiedthroughSEM.TEM.BETandlaserdiffractionparticlesizeanalysisandeffectsofPSandNSadditiononpropertiesoffreshandhardenedcement-basedmaterialswereinvestigated.TheresultsshowedthatPSaggregatedmuchmorethanNSandobviousbimodalparticlesizedistributionwhilebeingdirectlydispersedinwaterthroughultrason

5、icdispersion・ThemeasuredsedigraphofmedianparticlediameterD5oandDgoreachedashighas58.187口mand105.326",whichwasevenmuchhigherthanthatofthegrade52.5cementusedinthestudy.AdditionofNSlowerthan1.0%showedaslighteffectonviscosityofthefreshcementpaste，however*theviscosityshowedacontinuousincreasewithincre

6、asingthePSadditionandasharprisewhenPSadditionwashigherthan1.0%.SettingandhardeningofthecementpastecanalsobeenhancedbyaddingPS.Within1%PSaddition，bothcompressivestrengthandchloridepenetrationresistaneeofthehardenedcementmortarwereobviouslyenhanced.Keywords:precipitatedsilica；nano-silica；rheologica

7、lbehavior；chloridepenetrationresistanee收稿日期2011-03-18基金项目杭州市科技计划项目文0070733B20)，作價啊哎和际昴嵩伽rfh搦W鼠腮离財那隴曆側料吨內酗碾暂餓3.呵哽勲礁風艇％教授，E-mail:kongdeyu@zjut.edu.cn.S-4700型扫描电镜对PS和NS进行SEM测试爭用ASAO2020M+C全自动微孔物理化学吸附仪测<1QO4-2013ChinaAcade