Evaluating the efficiency of SCMs to avoid or mitigate ASR-induced expansion and deterioration through a multi-level assessment

Souza, Diego Jesus de; Sanchez, Leandro

doi:10.1016/j.cemconres.2023.107262

Cited by 15 publications

(1 citation statement)

References 47 publications

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“…(a) (b) Souza and Sanchez [56] analysed the influence of various SCMs to avoid or mitigate ASR-induced expansion, and they examined the Vickers microhardness profile of the ASR products within the aggregate grains, and of the ASR gel within the aggregates/ASR gel at the edge of the aggregate/ASR gel in the binder paste using 98 mN. They showed that the ASR gel demonstrated lower Vickers hardness values when it was within the aggregate particles compared to when the gel was in contact with the cement matrix.…”

Section: Discussionmentioning

confidence: 99%

Initial Characteristics of Alkali–Silica Reaction Products in Mortar Containing Low-Purity Calcined Clay

Jóźwiak-Niedźwiedzka,

Jaskulski,

Dziedzic

et al. 2024

Materials

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An alkali–silica reaction (ASR) is a chemical process that leads to the formation of an expansive gel, potentially causing durability issues in concrete structures. This article investigates the properties and behaviour of ASR products in mortar with the addition of low-purity calcined clay as an additional material. This study includes an evaluation of the expansion and microstructural characteristics of the mortar, as well as an analysis of the formation and behaviour of ASR products with different contents of calcined clay. Expansion tests of the mortar beam specimens were conducted according to ASTM C1567, and a detailed microscopic analysis of the reaction products was performed. Additionally, their mechanical properties were determined using nanoindentation. This study reveals that with an increasing calcined clay content, the amount of the crystalline form of the ASR gel decreases, while the nanohardness increases. The Young’s modulus of the amorphous ASR products ranged from 5 to 12 GPa, while the nanohardness ranged from 0.41 to 0.67 GPa. The obtained results contribute to a better understanding of how the incorporation of low-purity calcined clay influences the ASR in mortar, providing valuable insights into developing sustainable and durable building materials for the construction industry.

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Section: Discussionmentioning

confidence: 99%