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首页> 外文会议>SP-228; International Symposium on Utilization of High-Strength/High-Performance Concrete vol.1; 20050620-24; Washington,DC(US) >Comparision of Two Metakaolins and a Silica Fume Used as Supplementary Cementitious Materials
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Comparision of Two Metakaolins and a Silica Fume Used as Supplementary Cementitious Materials

机译：两种偏高岭土和硅粉作为辅助胶凝材料的比较

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摘要

The performance of two metakaolins as supplementary cementitious materials (SCMs) was evaluated at 8% by weight cement replacement. The metakaolins varied by their surface area (11.1 vs. 25.4 m~2/g). Performance of metakaolin mixtures was compared to control mixtures at water-to-cement ratios of 0.40, 0.50, and 0.60 where no SCM had been used and to mixtures where silica fume had been used as partial replacement for cement. In both mixtures containing metakaolins, compressive, splitting tensile, and flexural strengths increased, as well as elastic modulus, as compared to control mixtures. Setting time was reduced in the pastes with both metakaolins. Additionally, considering durability, both metakaolins reduced rapid chloride ion permeability and expansion due to alkali-silica reaction when compared to control and silica fume mixtures. In general, the finer of the two metakaolins proved more effective in improving concrete properties, although both performed superior to silica fume.
机译：两种偏高岭土作为补充胶凝材料（SCM）的性能按水泥替代物的重量计为8％。偏高岭土的表面积不同（11.1对25.4 m〜2 / g）。在水灰比为0.40、0.50和0.60的情况下（未使用SCM的情况下），将偏高岭土混合物的性能与对比例的混合物进行了比较，并与使用硅粉作为水泥的部分替代品的混合物进行了比较。与对照混合物相比，在两种包含偏高岭土的混合物中，抗压强度，劈裂抗张强度和挠曲强度以及弹性模量均增加。两种偏高岭土的糊剂都减少了凝固时间。另外，考虑到耐久性，与对照和硅粉混合物相比，两种偏高岭土都降低了快速的氯离子渗透性和由于碱-二氧化硅反应而引起的膨胀。通常，两种偏高岭土中较细的一种在改善混凝土性能方面更为有效，尽管它们的性能均优于硅粉。

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