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测定热活化低品位黏土火山灰活性的困难

Difficulties in Determining the Pozzolanic Activity of Thermally Activated Lower-Grade Clays.

作者信息

Šádková Kateřina, Pommer Vojtěch, Keppert Martin, Vejmelková Eva, Koňáková Dana

机构信息

Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic.

出版信息

Materials (Basel). 2024 Oct 18;17(20):5093. doi: 10.3390/ma17205093.

DOI:10.3390/ma17205093
PMID:39459804
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11509283/
Abstract

Thermally activated clays (TACs) have been identified as possible supplementary cementitious materials (SCMs). To find a suitable clay and to optimise the activation process, it is necessary to determine its pozzolanic activity. However, the nature of clays is different from that of conventional SCMs. Therefore, the results of commonly used methods may differ; in some cases, they can even be misrepresented and misleading. This article aims to assess their applicability to TAC. Four direct and four indirect methods were compared by determination of the pozzolanic activity of three different clays calcined at varying temperatures. The isothermal calorimetry with lime combined with the mechanical strength's development was identified as an ideal combination. Contrarily, the lime saturation test was inapplicable. For the Frattini method, it was found to be beneficial to assess the change in activity due to the thermal treatment rather than the strict comparison with a calcium hydroxide saturation curve.

摘要

热活化粘土（TACs）已被确定为可能的辅助胶凝材料（SCMs）。为了找到合适的粘土并优化活化过程，有必要确定其火山灰活性。然而，粘土的性质与传统的SCMs不同。因此，常用方法的结果可能会有所不同；在某些情况下，甚至可能被错误表述和误导。本文旨在评估它们对TAC的适用性。通过测定三种在不同温度下煅烧的不同粘土的火山灰活性，比较了四种直接方法和四种间接方法。石灰等温量热法与力学强度发展相结合被确定为理想的组合。相反，石灰饱和度试验不适用。对于弗拉蒂尼方法，发现评估热处理引起的活性变化比与氢氧化钙饱和曲线进行严格比较更有益。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3f59/11509283/359d31f2acc6/materials-17-05093-g014.jpg
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