Delayed Absorption Superabsorbent Polymer for Strength Development in Concrete

Morinaga, Yuka; Akao, Yuya; Fukuda, Daisuke et al.

Materials, 2022, 15(8), 2727

Permalink : https://hdl.handle.net/2115/85495

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https://doi.org/10.3390/ma15082727     72

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アクセス権
open access
URI
https://hdl.handle.net/2115/85495
タイトル
Delayed Absorption Superabsorbent Polymer for Strength Development in Concrete
著者
Morinaga, Yuka ; Akao, Yuya ; Fukuda, Daisuke ; Elakneswaran, Yogarajah
著者名
Morinaga, Yuka
著者名
Akao, Yuya
e-Rad_Researcher
80647181
著者名
Fukuda, Daisuke
著者名
Elakneswaran, Yogarajah
言語
英語
キーワード
superabsorbent polymer
compressive strength
pore structure
hydration rate
concrete
発行日
2022-04
出版者
MDPI
収録物名
Materials
巻(号)
15(8)
ページ
2727
抄録
Superabsorbent polymers (SAPs) are used as internal curing agents in cementitious materials, which reduce autogenous shrinkage in concrete as they have a low water-to-cement ratios and improve the freeze-thaw resistance. However, the compressive strength of concrete may also be reduced due to additional voids in the hydrated cement matrix. In this study, we fabricated a delayed absorption type of SAP (I-SAP) composed of cross-linked modified acrylate and studied its absorption characteristics and effect on compressive strength after 28 days. Furthermore, the effect of curing conditions on the strength of concrete and hydrated cement paste with SAP were investigated. The absorption capacity of I-SAP in the synthetic pore solution and deionised water was examined and compared with that of a conventional SAP, and the former was absorbed more by I-SAP. The results revealed that the compressive strength of concrete increased with the addition of I-SAP, particularly with the curing condition of 60% RH. Although the compressive strength of hydrated cement paste with I-SAP reduced in water or sealed curing conditions, no loss of strength in the paste cured at 60% RH was seen. The cement matrix densification due to hydration of belite around the SAP surface is the main mechanism for strength development in concrete cured at sealed and 60% RH. However, the voids formed by SAP control the compressive strength of hydrated paste.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.3390/ma15082727