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

Delft University of Technology
Swiss Federal Laboratories for Materials Science and Technology (Empa)
University of Minho
ETH Zurich
Ghent University

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

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
Journal	Cement and Concrete Research
Volume	135
DOIs	https://doi.org/10.1016/j.cemconres.2020.106123
State	Published - Sep 2020
Externally published	Yes

Keywords

Alkali-activated slag
Cracking
Mechanical properties
Shrinkage
Superabsorbent polymers

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10.1016/j.cemconres.2020.106123

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.",

keywords = "Alkali-activated slag, Cracking, Mechanical properties, Shrinkage, Superabsorbent polymers",

author = "Zhenming Li and Mateusz Wyrzykowski and Hua Dong and Jos{\'e} Granja and Miguel Azenha and Pietro Lura and Guang Ye",

note = "Publisher Copyright: {\textcopyright} 2020 The Authors",

year = "2020",

month = sep,

doi = "10.1016/j.cemconres.2020.106123",

language = "英语",

volume = "135",

journal = "Cement and Concrete Research",

issn = "0008-8846",

publisher = "Elsevier Ltd",

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TY - JOUR

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 - 2020/9

Y1 - 2020/9

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

UR - https://www.scopus.com/pages/publications/85084952362

U2 - 10.1016/j.cemconres.2020.106123

DO - 10.1016/j.cemconres.2020.106123

M3 - 文章

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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