不同矿物组成水泥与高效减水剂适应性研究

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1、摘要Ii,!_摘要随着商品混凝±、流态混凝土、高强高性能混凝土应用的普及，高效减水栽的推广应用，高效减水剂与水泥的适应性问题越来越受到人们的重视。本文通过研究不同矿物组成的纯硅酸盐水泥对三种高效减水剂的吸附、动电电位和净浆流动度等性能，探讨了矿物组成对水泥与高效减水剂适应性的影响。建立了水泥矿物组成、高效减水剂吸附量和流动性之间的关系，从而可以根据水泥矿物组成预测或计算水泥的应用性能。研究结果表明纯硅酸盐水泥中的四种主要矿物(C3S、C3S、C3A、C4AF)中，C3A对高效减水剂的吸附能力最强，其次为C3S。CaA、C3S的含量是水泥与高效减水剂适应性的主要影响因素，与c3A、

2、C3S相比，C4AF和c2s的含量对适应性的影响不大。在本文所研究的纯硅酸盐水泥中，低石灰饱和系数(KH=0．88>的水泥以及中高石灰饱和系数(KH=0．91、KH=0．94)中铝率低(IM=I．4或1．6)的水泥对高效减水剂的吸附量小，永泥净浆流动度大，与高效减水剂的适应性普遍较好。中高石灰饱和系数中铝率高(IM=1．8)的水泥与高效减水剂的适应性差。随着石灰饱和系数的增大，水泥中c3s含量增加，水泥颗粒对高效减水剂的吸附量增多。同一种水泥对不同高效减水剂的吸附量是不同的，水泥净浆流动度也是不同的，而且差别较大，吸附量小的商效减水栽，其净浆流动度大。关键词水泥熟料矿物；高效减水

3、剂；适应性；吸附量；流动性AbstractWhenthecommodityconcrete，thefluidizedconcreteandthehighperformanceconcretearewidelyusedintheengineering，thesuperplasticizerispopularized．Peoplepaymoreattentiontothecompatibilitybetweenthecementandthesuperplasticizer．Inthisarticlebythetestingoftheadsorptiononthecementdiffe

4、rentincomposition,theZetapotentialandthefluidityonthecementpaste，weexploretheinfluenceofmineralcomposition0nthecompatibilitybetweentheneatPortlandcementandthesuperplasticizer．Therelationshipbetweenthecompositionofthecementclinkerminerals，theadsorptionandthefluidityisestablished．Furthermore，we

5、callpreviewthecementapplicationperformanceinresponsetothemineralcomposition．TheresearchindicatesC3Aadsorptionisatthemostinfourprimarymineralsof血eneatPortlandcement．TheinfluenceofC3AandC3ScontentintheneatPortlandcementonthecompatibilitybetweenthecementandthesuperplasticizerissignificant．Compar

6、ing、析也C3AandC3S．thecontentsofC4AFandC2Sonthecompatibilitybetweenthecementandthesuperplasticizerareminute．Inthisarticle，forKH=0．88，Ktt=0．94andKH=0．91neatPortlandcement(inthecaseofIM=I．4Or1．6)，theadsorptivecapacityissmall，butthefluidityofthecementpasteislarge，moreover,曲eeompmibilitybetweenthece

7、mentandthesuperplasficizerisgood．ForKH=0．94andKH=0．91neatPortlandcement．whenIM=1．8thecompatibilitybetweenthecementandthesuperplasticizerisbad．IfKHrises，C3Scontentbecomesbigger,andadsorptivecapacityislargerForthesameneatPortlandcement,theadsor