Acid resistance of alkali-activated materials: recent advances and research needs

RILEM Technical Letters

article

Gregor Gluth¹  Cyrill Grengg²  Neven Ukrainczyk³  Florian Mittermayr⁴  Martin Dietzel² 

[1] Division 7.4 Technology of Construction Materials;Institute of Applied Geosciences, Graz University of Technology;Institute of Construction and Building Materials, Technical University of Darmstadt;Institute of Technology and Testing of Building Materials, Graz University of Technology

关键词: Acid corrosion;    Inorganic acids;    Organic acids;    Durability;    Geopolymers;   

DOI  :  10.21809/rilemtechlett.2022.157

学科分类：社会科学、人文和艺术（综合）

来源: RILEM Publications SARL

【 摘 要 】

Cementitious materials are frequently applied in environments in which they are exposed to acid attack, e.g., in sewer systems, biogas plants, and agricultural/food-related industries. Alkali-activated materials (AAMs) have repeatedly been shown to exhibit a remarkably high resistance against attack by organic and inorganic acids and, thus, are promising candidates for the construction and the repair of acid-exposed structures. However, the reaction mechanisms and processes affecting the acid resistance of AAMs have just recently begun to be understood in more detail. The present contribution synthesises these advances and outlines potentially fruitful avenues of research. The interaction between AAMs and acids proceeds in a multistep process wherein different aspects of deterioration extend to different depths, complicating the overall determination of acid resistance. Partly due to this indistinct definition of the ‘depth of corrosion’, the effects of the composition of AAMs on their acid resistance cannot be unambiguously identified to date. Important parallels exist between the deterioration of low-Ca AAMs and the weathering/corrosion of minerals and glasses (dissolution-reprecipitation mechanism). Additional research requirements relate to the deterioration mechanism of high-Ca AAMs; how the character of the corroded layer influences the rate of deterioration; the effects of shrinkage and the bond between AAMs and substrates.

【 授权许可】

CC BY