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Internal curing of alkali-activated fly ash-slag pastes using superabsorbent polymer

Tu, W; Zhu, Y; Fang, G; Wang, X; Zhang, M; (2018) Internal curing of alkali-activated fly ash-slag pastes using superabsorbent polymer. Cement and Concrete Research , 116 pp. 179-190. 10.1016/j.cemconres.2018.11.018. Green open access

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Abstract

To mitigate autogenous shrinkage that may cause early-age cracking of alkali-activated fly ash-slag (AAFS) concrete, internal curing using superabsorbent polymers (SAP) is employed in this study. AAFS pastes with different SAP dosages (0–0.5%) and slag replacement ratios to fly ash (15–30%) are investigated. Experimental results indicate that with the addition of SAP workability of fresh paste is improved while compressive strength is comparatively reduced. As SAP dosage increases from 0.2% to 0.5%, chemical shrinkage and autogenous shrinkage of AAFS pastes are reduced by around 18% to 45% and 76% to 85%, respectively. Internal curing of SAP is found to lower the heat peak and shift the peak to the right. This indicates the slower hydration rate corresponding to the lower chemo-mechanical deformation (chemical shrinkage), which contributes to the mitigation of autogenous shrinkage. Therefore, internal curing by means of SAP is an efficient method for mitigating autogenous shrinkage in AAFS pastes.

Type: Article
Title: Internal curing of alkali-activated fly ash-slag pastes using superabsorbent polymer
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cemconres.2018.11.018
Publisher version: https://doi.org/10.1016/j.cemconres.2018.11.018
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Alkali activated concrete (D); Shrinkage (C); Workability (C); Compressive strength (C); Pore size distribution (B)
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10062880
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