Journal
CEMENT AND CONCRETE RESEARCH
Volume 156, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2022.106768
Keywords
Alkali-activated materials; Alkali-silica reaction; Early-age alkali-activation; Fly ash; Slag
Funding
- Japan Society for the Promotion of Science [18H03803]
- China Scholarship Council [201806420031]
- Nanotechnology Platform of the Ministry ofEducation, Culture, Sports, Science and Technology (MEXT) , Japan
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The ASR behavior of AAS/AAFA mortars was investigated and compared with OPC mortars, revealing that ASR-induced expansion in AAS mortar bars occurred earlier than in OPC mortar bars due to the early participation of reactive silica from aggregates in alkali-activation. The Ca/Si ratio of amorphous ASR products in AAS mortars was lower, while Al/Si and Na/K ratios were higher than that of OPC mortars.
To provide a better understanding of the mechanism of alkali-silica reaction (ASR) in alkali-activated materials (AAMs) system, in this work, the ASR behavior of alkali-activated slag (AAS)/fly ash (AAFA) mortars were investigated, and compared with ordinary Portland cement (OPC) mortars. It is found that although the AAS mortar bars experience the shrinkage first, the onset of ASR-induced expansion of AAS mortar bars is earlier than OPC mortar bars. In AAMs system, the reactive silica from aggregates is evidently dissolved and participated in the early-age alkali-activation, and thereby leads to the reduction of reactive silica for ASR. The Ca/Si ratio of amorphous ASR products in AAS mortars was lower, while Al/Si and Na/K ratios were higher than that of OPC mortars. Based on the obtained experimental evidences, a conceptual model was proposed to interpret and compare the ASR behavior in OPC, AAS and AAFA systems.
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