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Evaluation of blends of high and low calcium fly ashes for use as supplementary cementing Materials

机译：评价高钙粉煤灰和低钙粉煤灰的掺量，以用作辅助固井材料

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The present paper outlines the results of a research attempt aimed at developing and evaluating the performance of ternary blended cements, incorporating mixtures of two different types of fly ash (of high and low calcium content). The main target of this study was to investigate whether and by what means, the introduction of a certain type of fly ash into a fly ash-cement (FC) matrix containing a different type of ash, can improve the performance of the initial binary system. For achieving this, new pozzolans were prepared by mixing, in selected proportions, a high lime fly ash with an ash of lower calcium content. The efficiency of the new materials was examined in terms of active silica content, pozzolanic activity potential, strength development, kappa-values and progress of the pozzolanic action by means of fixed lime capabilities. The results obtained demonstrated that the mixtures containing equal amounts of each fly ash were the most effective for moderate cement substitution, whilst for higher replacements the intermixture possessing the highest active silica content shows supremacy at almost all hydration ages. The superior performance of the ternary fly ash blends was mainly attributed to synergistic effects detected for all the ashes utilized. These were quantified in each case and almost linear correlations were obtained with the ^-values of the most efficient ternary mixes. ? 2004 Elsevier Ltd. All rights reserved.
机译：本文概述了旨在开发和评估三元掺合水泥性能的研究成果，其中掺入了两种不同类型的粉煤灰（高钙含量和低钙含量）的混合物。这项研究的主要目标是研究将某种类型的粉煤灰引入包含不同类型粉煤灰的粉煤灰水泥（FC）基质中是否可以通过何种方式来改善初始二元系统的性能。 。为了达到这个目的，通过以选定的比例混合高石灰粉煤灰和较低钙含量的灰来制备新的火山灰。通过固定的石灰能力，根据活性二氧化硅含量，火山灰活性潜力，强度发展，kappa值和火山灰作用的​​进展，检查了新材料的效率。获得的结果表明，含有相同量的每种粉煤灰的混合物对于中等程度的水泥替代最为有效，而对于更高的替代率，具有最高活性二氧化硅含量的混合物在几乎所有水合年龄都表现出至高无上的地位。三元粉煤灰混合物的优异性能主要归因于所利用的所有灰烬的协同效应。在每种情况下都对它们进行了量化，并且使用最有效的三元混合的^值获得了几乎线性的相关性。 ？ 2004 Elsevier Ltd.保留所有权利。

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