Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 16, Issue -, Pages 619-630Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2021.12.031
Keywords
Alkali activated materials; pH; Alkali dissolution; Leaching concentration; Acid corrosion; Alkali corrosion
Funding
- Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resources Key Laboratory of Sichuan Province [ZDKF-2019-001]
- Applied Basic Research of Sichuan Science and Technology Program [2019YJ0596]
- Major Project for Ecoenvironmental protection of Sichuan Science and Technology Program [2018SZDZX0028]
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The study revealed that alkali-activated materials exhibit good durability in alkaline environments, but corrode in acidic environments, leading to decreased durability.
This work explores the durability of alkali-activated materials exposed to acidic and alkaline environments to analyze and evaluate their applications. The alkali-activated materials of metakaolin and metakaolin-mine tailings were immersed in solutions of different pH values for 90 days, in which the durability of materials was studied. Characterizations include pH, FTIR, XRD, SEM and 29Si NMR measurements. It was found that the alkali-excited materials have good durability in an alkaline environment. A small amount of lye was diluted in the neutral solution, leading to a decrease in the amount of gel and a slight deterioration of the durability of the materials. Moreover, alkali-activated materials were corroded in acidic environments, leading to poor durability because hydrogen ions (H thorn ) attacked N-A-S-H and C-A-S-H gels, and production of new sinjarite (CaCl2) mineral phases. This work provides a scientific reference value for the application of alkaliactivated materials in daily environment. (c) 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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