Internal curing by superabsorbent polymers in alkali-activated slag

Zhenming Li; Mateusz Wyrzykowski; Hua Dong; José Granja; Miguel Azenha; Pietro Lura; Guang Ye

doi:10.1016/j.cemconres.2020.106123

Internal curing by superabsorbent polymers in alkali-activated slag

Zhenming Li^*, Mateusz Wyrzykowski, Hua Dong, José Granja, Miguel Azenha, Pietro Lura, Guang Ye

^*Corresponding author for this work

Materials and Environment

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Abstract

In this study, internal curing by superabsorbent polymers (SAP) is utilized to mitigate self-desiccation and autogenous shrinkage of alkali-activated slag (AAS) pastes. Absorption and desorption kinetics of SAP incorporated in AAS pastes were studied with X-ray tomography. Internal curing delayed the peak of the rate of heat liberation but increased the total reaction degree of AAS pastes. Internal curing by SAP mitigated effectively the drop of internal relative humidity and the self-desiccation-induced autogenous shrinkage of AAS pastes. The cracking tendency of AAS pastes undergoing shrinkage in restrained conditions was also significantly reduced with SAP. Nonetheless, adding SAP, regardless of their content, cannot eliminate the autogenous shrinkage of AAS pastes, suggesting the existence of other autogenous shrinkage mechanism(s) besides self-desiccation.

Original language	English
Article number	106123
Number of pages	13
Journal	Cement and Concrete Research
Volume	135
DOIs	https://doi.org/10.1016/j.cemconres.2020.106123
Publication status	Published - 2020

Keywords

Alkali-activated slag
Cracking
Mechanical properties
Shrinkage
Superabsorbent polymers

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10.1016/j.cemconres.2020.106123

1-s2.0-S000888462030123X-mainFinal published version, 2.65 MBLicence: CC BY

Cite this

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title = "Internal curing by superabsorbent polymers in alkali-activated slag",

abstract = "In this study, internal curing by superabsorbent polymers (SAP) is utilized to mitigate self-desiccation and autogenous shrinkage of alkali-activated slag (AAS) pastes. Absorption and desorption kinetics of SAP incorporated in AAS pastes were studied with X-ray tomography. Internal curing delayed the peak of the rate of heat liberation but increased the total reaction degree of AAS pastes. Internal curing by SAP mitigated effectively the drop of internal relative humidity and the self-desiccation-induced autogenous shrinkage of AAS pastes. The cracking tendency of AAS pastes undergoing shrinkage in restrained conditions was also significantly reduced with SAP. Nonetheless, adding SAP, regardless of their content, cannot eliminate the autogenous shrinkage of AAS pastes, suggesting the existence of other autogenous shrinkage mechanism(s) besides self-desiccation.",

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journal = "Cement and Concrete Research",

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T1 - Internal curing by superabsorbent polymers in alkali-activated slag

AU - Li, Zhenming

AU - Wyrzykowski, Mateusz

AU - Dong, Hua

AU - Granja, José

AU - Azenha, Miguel

AU - Lura, Pietro

AU - Ye, Guang

PY - 2020

Y1 - 2020

N2 - In this study, internal curing by superabsorbent polymers (SAP) is utilized to mitigate self-desiccation and autogenous shrinkage of alkali-activated slag (AAS) pastes. Absorption and desorption kinetics of SAP incorporated in AAS pastes were studied with X-ray tomography. Internal curing delayed the peak of the rate of heat liberation but increased the total reaction degree of AAS pastes. Internal curing by SAP mitigated effectively the drop of internal relative humidity and the self-desiccation-induced autogenous shrinkage of AAS pastes. The cracking tendency of AAS pastes undergoing shrinkage in restrained conditions was also significantly reduced with SAP. Nonetheless, adding SAP, regardless of their content, cannot eliminate the autogenous shrinkage of AAS pastes, suggesting the existence of other autogenous shrinkage mechanism(s) besides self-desiccation.

AB - In this study, internal curing by superabsorbent polymers (SAP) is utilized to mitigate self-desiccation and autogenous shrinkage of alkali-activated slag (AAS) pastes. Absorption and desorption kinetics of SAP incorporated in AAS pastes were studied with X-ray tomography. Internal curing delayed the peak of the rate of heat liberation but increased the total reaction degree of AAS pastes. Internal curing by SAP mitigated effectively the drop of internal relative humidity and the self-desiccation-induced autogenous shrinkage of AAS pastes. The cracking tendency of AAS pastes undergoing shrinkage in restrained conditions was also significantly reduced with SAP. Nonetheless, adding SAP, regardless of their content, cannot eliminate the autogenous shrinkage of AAS pastes, suggesting the existence of other autogenous shrinkage mechanism(s) besides self-desiccation.

KW - Alkali-activated slag

KW - Cracking

KW - Mechanical properties

KW - Shrinkage

KW - Superabsorbent polymers

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DO - 10.1016/j.cemconres.2020.106123

M3 - Article

AN - SCOPUS:85084952362

SN - 0008-8846

VL - 135

JO - Cement and Concrete Research

JF - Cement and Concrete Research

M1 - 106123

ER -

Internal curing by superabsorbent polymers in alkali-activated slag

Abstract

Keywords

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