Efficacy of SCMs to mitigate ASR in systems with higher alkali contents assessed by pore solution method

Journal Article · Thu Apr 15 04:00:00 EDT 2021 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2021.106353· OSTI ID:23206347

Sofia, Lionel ^[1]; Vessalas, Kirk; Thomas, Paul; Sirivivatnanon, Vute ^[2]; Scrivener, Karen ^[1]

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1. École Polytechnique Fédérale de Lausanne (Switzerland)
2. University of Technology Sydney (Australia)

This study demonstrates the efficacy of supplementary cementitious materials (SCMs) to mitigate alkali-silica reaction (ASR) even when used in conjunction with cement of higher alkali contents (up to 1% Na{sub 2}O{sub eq}). The expansion of concrete prisms was studied immersed in simulated pore solution in order to address the limitations of conventional ASR testing methods, accelerated mortar bar test (AMBT) and concrete prism test (CPT). Expansion results demonstrate that 25% fly ash and 50% slag are both sufficient to mitigate ASR even with cements with alkali content up to 1% Na{sub 2}O{sub eq} and that the pore solution method is a viable alternative ASR testing method. Massive amounts of ASR products (~20 μm thickness) were observed in concretes without SCMs consistent with high degree of expansion and extensive cracking. Small amounts of ASR products (≤5 μm thickness) were also observed in concrete with SCMs despite absence of significant expansion.

• OSTI ID: 23206347
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 142; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BLAST FURNACES
CONCRETES
CRACKING
FLY ASH
MORTARS
SILICA
SIMULATION
SLAGS
SOLUTIONS
THICKNESS