文章基本信息

标题：Synthesis and characterization of kaolinite-based geopolymer: Alkaline activation effect on calcined kaolinitic clay at different temperatures
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作者：Nmiri A. ; Hamdi N. ; Yazoghli-Marzouk O. 等
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2017
卷号：8
期号：2
页码：676-690
出版社：University of Mohammed Premier Oujda
摘要：In the present work we sought to determine the most convenient calcinationtemperature of Tunisian kaolinitic clay in order to produce a more reactivemetakaolin and to determine the most suitable potassium hydroxide (KOH) andsodium hydroxide (NaOH) concentration to produce geopolymer cements withgood physical and mechanical performance, less energy consumption and lowcarbon dioxide emission. This product would play the role of a constructionmaterial able to replace Portland cement. The kaolinitic clay fractions collectedfrom Tabarka (Tunisia) were first calcined at different temperatures ranging from550 °C to 1 100 °C. Calcined fractions were then activated by potassium hydroxideand sodium hydroxide solutions with concentrations of between 5 M to 18 M. Themineral and chemical composition of raw and geopolymer samples wascharacterized by X-ray diffraction, infrared spectroscopy and thermal analysis,whereas the mechanical and physical properties of hardened samples werecharacterized respectively by compressive strength, porosity and water absorption.The results obtained showed that the temperature required to obtain a metakaolinwith the highest degree of reactivity is approximately 700 °C. The various physicalproperties reached optimum values at this temperature and for base concentrationequal to 13 M. These values decreased at higher temperature and concentration.
关键词：Kaolinitic clay; Calcination; Metakaolin; Alkaline solution; Geopolymer; Compressive strength