Multiscale microstructure and micromechanical properties of alkali-activated concrete: A critical review

Article


Tu, W. and Zhang, M. 2024. Multiscale microstructure and micromechanical properties of alkali-activated concrete: A critical review. Cement and Concrete Composites. 152 (Art. 105664). https://doi.org/10.1016/j.cemconcomp.2024.105664
AuthorsTu, W. and Zhang, M.
Abstract

With the rapid development of alkali-activated concrete (AAC) as a promising sustainable concrete, it is vital to thoroughly understand the microstructural characteristics and micromechanical properties, which determine the macroscopic mechanical properties and structural performance of AAC. This paper presents a critical review on the multiscale microstructure and micromechanical properties of AAC with both single and blend precursor systems, including alkali-activated fly ash (AAF), alkali-activated metakaolin (AAMK), alkali-activated slag (AAS), and alkali-activated fly ash-slag (AAFS). These types of AAC are systematically studied from nano-scale to macro-scale, covering solid gel particles (N-A-S-H, C-A-S-H and N-C-A-S-H), gel matrix (solid gel particles + gel pores), paste (unreacted particles + reaction products + pores), mortar and concrete (paste + interfacial transition zone + aggregates). The recent advances in microstructure and micromechanical properties of AAC are discussed, with special focus on microstructure-mechanical property relationships. The remaining challenges and opportunities for future research are also provided.

JournalCement and Concrete Composites
Journal citation152 (Art. 105664)
ISSN1873-393X
0958-9465
Year2024
PublisherElsevier
Accepted author manuscript
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File Access Level
Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cemconcomp.2024.105664
Publication dates
Online11 Jul 2024
Publication process dates
Accepted09 Jul 2024
Deposited26 Jul 2024
Copyright holder© 2024 Elsevier
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