Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars
Alkali activated slag (AAS) mortar is becoming an increasingly popular green building material because of its excellent engineering properties and low CO<sub>2</sub> emissions, promising to replace ordinary Portland cement (OPC) mortar. However, AAS’s high shrinkage and short setting tim...
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doaj-f6ba5c429e824fdaa136ee6c7c455ab52020-11-25T03:54:57ZengMDPI AGMaterials1996-19442020-09-01134318431810.3390/ma13194318Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag MortarsPengju Wang0Haiming Chen1Peiyuan Chen2Jin Pan3Yangchen Xu4Hao Wang5Wenfeng Shen6Ke Cao7School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaAlkali activated slag (AAS) mortar is becoming an increasingly popular green building material because of its excellent engineering properties and low CO<sub>2</sub> emissions, promising to replace ordinary Portland cement (OPC) mortar. However, AAS’s high shrinkage and short setting time are the important reasons to limit its wide application in engineering. This paper was conducted to investigate the effect of internal curing(IC) by super absorbent polymer (SAP) on the autogenous shrinkage of AAS mortars. For this, an experimental study was carried out to evaluate the effect of SAP dosage on the setting time, autogenous shrinkage, compressive strength, microstructure, and pore structure. The SAP were incorporated at different dosage of 0, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 percent by weight of slag. The workability, physical (porosity), mechanical, and shrinkage properties of the mortars were evaluated, and a complementary study on microstructure was made. The results indicated that the setting time increased with an increase of SAP dosage due to the additional activator released by SAP. Autogenous shrinkage decreased with an increase of SAP dosage, and was mitigated completely when the dosage of SAP ≥ 0.2% wt of slag. Although IC by means of SAP reduced the compressive strength, this reduction (23% at 56 days for 0.2% SAP) was acceptable given the important role that it played on mitigating autogenous shrinkage. In the research, the 0.2% SAP dosage was the optimal content. The results can provide data and basis for practical application of AAS mortar.https://www.mdpi.com/1996-1944/13/19/4318alkali activated slagsuper absorbent polymerautogenous shrinkagecompressive strengthmicrostructure |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Pengju Wang Haiming Chen Peiyuan Chen Jin Pan Yangchen Xu Hao Wang Wenfeng Shen Ke Cao |
spellingShingle |
Pengju Wang Haiming Chen Peiyuan Chen Jin Pan Yangchen Xu Hao Wang Wenfeng Shen Ke Cao Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars Materials alkali activated slag super absorbent polymer autogenous shrinkage compressive strength microstructure |
author_facet |
Pengju Wang Haiming Chen Peiyuan Chen Jin Pan Yangchen Xu Hao Wang Wenfeng Shen Ke Cao |
author_sort |
Pengju Wang |
title |
Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars |
title_short |
Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars |
title_full |
Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars |
title_fullStr |
Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars |
title_full_unstemmed |
Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars |
title_sort |
effect of internal curing by super absorbent polymer on the autogenous shrinkage of alkali-activated slag mortars |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-09-01 |
description |
Alkali activated slag (AAS) mortar is becoming an increasingly popular green building material because of its excellent engineering properties and low CO<sub>2</sub> emissions, promising to replace ordinary Portland cement (OPC) mortar. However, AAS’s high shrinkage and short setting time are the important reasons to limit its wide application in engineering. This paper was conducted to investigate the effect of internal curing(IC) by super absorbent polymer (SAP) on the autogenous shrinkage of AAS mortars. For this, an experimental study was carried out to evaluate the effect of SAP dosage on the setting time, autogenous shrinkage, compressive strength, microstructure, and pore structure. The SAP were incorporated at different dosage of 0, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 percent by weight of slag. The workability, physical (porosity), mechanical, and shrinkage properties of the mortars were evaluated, and a complementary study on microstructure was made. The results indicated that the setting time increased with an increase of SAP dosage due to the additional activator released by SAP. Autogenous shrinkage decreased with an increase of SAP dosage, and was mitigated completely when the dosage of SAP ≥ 0.2% wt of slag. Although IC by means of SAP reduced the compressive strength, this reduction (23% at 56 days for 0.2% SAP) was acceptable given the important role that it played on mitigating autogenous shrinkage. In the research, the 0.2% SAP dosage was the optimal content. The results can provide data and basis for practical application of AAS mortar. |
topic |
alkali activated slag super absorbent polymer autogenous shrinkage compressive strength microstructure |
url |
https://www.mdpi.com/1996-1944/13/19/4318 |
work_keys_str_mv |
AT pengjuwang effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars AT haimingchen effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars AT peiyuanchen effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars AT jinpan effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars AT yangchenxu effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars AT haowang effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars AT wenfengshen effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars AT kecao effectofinternalcuringbysuperabsorbentpolymerontheautogenousshrinkageofalkaliactivatedslagmortars |
_version_ |
1724471625675440128 |