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Effect of calcined Czech claystone on the properties of high performance concrete: Microstructure, strength and durability
Construction and Building Materials ( IF 7.4 ) Pub Date : 2018-03-03 , DOI: 10.1016/j.conbuildmat.2018.02.204
Eva Vejmelková , Dana Koňáková , Magdalena Doleželová , Lenka Scheinherrová , Petr Svora , Martin Keppert , Pavel Reiterman , Robert Černý

Most supplementary cementitious materials (SCM) have been only rarely used in high performance concrete (HPC) design to date, silica fume being one of the very few exceptions in that respect. The content of many SCMs in blended cements was also often low because at higher dosage they were not capable to replace Portland cement effectively. Their environmental and economical advantages could thus be utilized in a limited extent only. In this paper, the effect of calcined Czech claystone (CCC) on the properties of HPC based on a binary binder containing Portland cement and silica fume was analyzed over a 10–60% range of Portland cement replacement in the mix. The material characterization experiments carried out using mercury intrusion porosimetry and scanning electron microscopy showed that an up to 30% presence of CCC in the blend resulted in a formation of closer packed HPC microstructures than if only silica fume was used as SCM. The highest compressive and bending strengths were achieved for the 30% Portland cement replacement level over the whole one year testing period. The best durability properties expressed in terms of water and water vapor transport parameters were observed for the same mix with 30% of CCC used instead of Portland cement.



中文翻译:

煅烧捷克粘土对高性能混凝土性能的影响:微观结构,强度和耐久性

迄今为止,大多数补充胶凝材料(SCM)很少用于高性能混凝土(HPC)设计中,硅粉是这方面的极少数例外之一。混合水泥中许多SCM的含量通常也很低,因为在较高剂量下它们不能有效替代波特兰水泥。因此,它们的环境和经济优势只能在有限的范围内加以利用。本文分析了煅烧捷克粘土(CCC)对基于波特兰水泥和硅粉的二元粘结剂的高性能混凝土的影响,分析了混合料中波特兰水泥替代量的10-60%。使用汞压入孔隙率法和扫描电子显微镜进行的材料表征实验表明,与仅使用硅粉作为SCM相比,共混物中高达30%的CCC存在会形成更紧密堆积的HPC微结构。在整个一年的测试期间,以30%的波特兰水泥替代量达到了最高的抗压强度和抗弯强度。对于使用30%的CCC代替波特兰水泥的相同混合物,观察到以水和水蒸气传输参数表示的最佳耐久性能。

更新日期:2018-03-03
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