Effect of sand content on bond performance of engineered geopolymer composites (EGC) repair material

Sushil Kumar; Chandra Sekhar Das; Jiancong Lao; Yazan Alrefaei; Jian-Guo Dai

doi:10.1016/j.conbuildmat.2022.127080

Effect of sand content on bond performance of engineered geopolymer composites (EGC) repair material

Sushil Kumar, Chandra Sekhar Das, Jiancong Lao, Yazan Alrefaei, Jian-Guo Dai^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

47 Citations (Scopus)

Abstract

Engineered geopolymer composites (EGC) have recently emerged as a greener and more environmentally friendly alternative to conventional engineered cementitious composites (ECC), achieving excellent mechanical and durability properties. This study investigated the effect of sand to binder (S/B) ratio on the bond performance of EGC repair material with concrete and steel reinforcement. The S/B ratio of EGC mixes was varied from 0.3 to 1.0, and its effect on the physical and mechanical properties was evaluated. It was found that increasing the S/B ratio decreased the micro-cracks at the EGC-concrete interface and, increased the bond strength. A direct correlation was observed between the elastic modulus of EGC and its bond strength with concrete substrate. The EGC-steel rebar pull-out strength initially increased and then decreased with the S/B ratio. The EGC repair material with S/B ratio more than or equal to 0.8 achieved the minimum EGC-concrete bond strength value of 1.5 MPa, as recommended by the BSI code. © 2022 Elsevier Ltd

Original language	English
Article number	127080
Journal	Construction and Building Materials
Volume	328
Online published	10 Mar 2022
DOIs	https://doi.org/10.1016/j.conbuildmat.2022.127080
Publication status	Published - 18 Apr 2022
Externally published	Yes

Funding

The authors would like to express their gratitude to Guangdong Province R&D Plan for Key Areas (Project code: 2019B111107002), Hong Kong-Guangzhou Technology and Innovation Partnership Program (Project code: 201807010055), Hong Kong RGC General Research Fund (Project code: 15219919) and National Natural Science Foundation of China (NSFC) Key Project (Project code: 51638008) for the financial support to this research work. The authors also thank the undergraduate students – Wai Yin Wong and Chun Yu Chan for their contribution to experimental work. Special thanks to Mr. John Chan and Ms. Dorothy Chan (laboratory technical staff) for providing their assistance while conducting the microstructure test.

Research Keywords

Alkali-activated materials (AAM)
Bond strength
EGC
Repair material
Sand to binder ratio

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abstract = "Engineered geopolymer composites (EGC) have recently emerged as a greener and more environmentally friendly alternative to conventional engineered cementitious composites (ECC), achieving excellent mechanical and durability properties. This study investigated the effect of sand to binder (S/B) ratio on the bond performance of EGC repair material with concrete and steel reinforcement. The S/B ratio of EGC mixes was varied from 0.3 to 1.0, and its effect on the physical and mechanical properties was evaluated. It was found that increasing the S/B ratio decreased the micro-cracks at the EGC-concrete interface and, increased the bond strength. A direct correlation was observed between the elastic modulus of EGC and its bond strength with concrete substrate. The EGC-steel rebar pull-out strength initially increased and then decreased with the S/B ratio. The EGC repair material with S/B ratio more than or equal to 0.8 achieved the minimum EGC-concrete bond strength value of 1.5 MPa, as recommended by the BSI code. {\textcopyright} 2022 Elsevier Ltd",

keywords = "Alkali-activated materials (AAM), Bond strength, EGC, Repair material, Sand to binder ratio",

author = "Sushil Kumar and {Sekhar Das}, Chandra and Jiancong Lao and Yazan Alrefaei and Jian-Guo Dai",

year = "2022",

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doi = "10.1016/j.conbuildmat.2022.127080",

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TY - JOUR

T1 - Effect of sand content on bond performance of engineered geopolymer composites (EGC) repair material

AU - Kumar, Sushil

AU - Sekhar Das, Chandra

AU - Lao, Jiancong

AU - Alrefaei, Yazan

AU - Dai, Jian-Guo

PY - 2022/4/18

Y1 - 2022/4/18

N2 - Engineered geopolymer composites (EGC) have recently emerged as a greener and more environmentally friendly alternative to conventional engineered cementitious composites (ECC), achieving excellent mechanical and durability properties. This study investigated the effect of sand to binder (S/B) ratio on the bond performance of EGC repair material with concrete and steel reinforcement. The S/B ratio of EGC mixes was varied from 0.3 to 1.0, and its effect on the physical and mechanical properties was evaluated. It was found that increasing the S/B ratio decreased the micro-cracks at the EGC-concrete interface and, increased the bond strength. A direct correlation was observed between the elastic modulus of EGC and its bond strength with concrete substrate. The EGC-steel rebar pull-out strength initially increased and then decreased with the S/B ratio. The EGC repair material with S/B ratio more than or equal to 0.8 achieved the minimum EGC-concrete bond strength value of 1.5 MPa, as recommended by the BSI code. © 2022 Elsevier Ltd

AB - Engineered geopolymer composites (EGC) have recently emerged as a greener and more environmentally friendly alternative to conventional engineered cementitious composites (ECC), achieving excellent mechanical and durability properties. This study investigated the effect of sand to binder (S/B) ratio on the bond performance of EGC repair material with concrete and steel reinforcement. The S/B ratio of EGC mixes was varied from 0.3 to 1.0, and its effect on the physical and mechanical properties was evaluated. It was found that increasing the S/B ratio decreased the micro-cracks at the EGC-concrete interface and, increased the bond strength. A direct correlation was observed between the elastic modulus of EGC and its bond strength with concrete substrate. The EGC-steel rebar pull-out strength initially increased and then decreased with the S/B ratio. The EGC repair material with S/B ratio more than or equal to 0.8 achieved the minimum EGC-concrete bond strength value of 1.5 MPa, as recommended by the BSI code. © 2022 Elsevier Ltd

KW - Alkali-activated materials (AAM)

KW - Bond strength

KW - EGC

KW - Repair material

KW - Sand to binder ratio

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DO - 10.1016/j.conbuildmat.2022.127080

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ER -

Effect of sand content on bond performance of engineered geopolymer composites (EGC) repair material

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