通过等温量热法研究土工聚合前体的反应性

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL Journal of Thermal Analysis and Calorimetry Pub Date : 2024-08-22 DOI:10.1007/s10973-024-13492-y
Martin Keppert, Dana Koňáková, Vojtěch Pommer, Eva Vejmelková, Robert Černý
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引用次数: 0

摘要

本文分析了四种土工聚合物前体(偏高岭土、矿渣和两种废陶瓷粉)在碱性活化过程中获得的等温导热量热响应。前两种前驱体是传统使用的材料,而后两种是新兴材料,了解它们的碱性活化过程可能对建筑和拆除废物的回收利用具有重要意义。所研究的前驱体不仅在化学成分上存在差异,在相组成上也不尽相同--废陶瓷前驱体的结晶度很高。研究发现,土工聚合过程中产生的总反应热与无定形物质含量以及活化产品的抗压强度成正比。这一发现可作为寻找新的潜在土工聚合物前体的快速评估工具。在所有实验中都观察到了溶解和缩聚步骤,其动力学用詹德方程来描述。虽然溶解步骤的速度与温度无关,但温度越高,缩聚速度越快。表观活化能描述了速率加速的程度;这些发现有助于调整土工聚合物的固化程序。
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Reactivity of precursors for geopolymerization studied by isothermal calorimetry

The paper deals with analyzes of Isothermal Conduction Calorimetry response obtained during the alkaline activation of four types of precursors (metakaolin, slag and two kinds of waste ceramic powders) to geopolymers. The first two precursors are traditionally used, while the latter two are emerging materials and knowledge of their alkaline activation might have high importance in the recycling of Construction and Demolition Waste. The studied precursors differ each to other not only in the chemical composition, but also in the phase composition—the waste ceramic precursors are highly crystalline. It was found that the total reaction heat evolved in the geopolymerization is directly proportional to the amorphous matter content as well as to the compressive strength of the activated product. This finding can be used as fast evaluation tool in searching of new potential geopolymer precursors. The dissolution and polycondensation steps were observed in all experiments and their kinetics was described by Jander’s equation. While the rate of dissolution step is not dependent on temperature, the polycondensation has been accelerated by the higher temperature. The level of the rate acceleration was described by apparent activation energy; these findings can be useful in tuning of geopolymers curing procedure.

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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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