Strain-hardening alkali-activated fly ash/slag composites with ultra-high compressive strength and ultra-high tensile ductility

Jian-Cong Lao; Bo-Tao Huang; Yi Fang; Ling-Yu Xu; Jian-Guo Dai; Surendra P. Shah

doi:10.1016/j.cemconres.2022.107075

Strain-hardening alkali-activated fly ash/slag composites with ultra-high compressive strength and ultra-high tensile ductility

Jian-Cong Lao, Bo-Tao Huang^*, Yi Fang, Ling-Yu Xu, Jian-Guo Dai^*, Surendra P. Shah

^*Corresponding author for this work

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

213 Citations (Scopus)

Abstract

This study designed and developed strain-hardening alkali-activated fly ash/slag composites (SH-AAFSC) with both ultra-high compressive strength and ultra-high tensile ductility for the first time. The developed SH-AAFSC showed a compressive strength of 94.4–180.7 MPa and a tensile strain capacity of 8.1–9.9 %, which successfully pushed the performance envelope of alkali-activated materials. A multi-scale investigation was conducted to get an in-depth understanding of the obtained mechanical properties. Results showed that higher GGBS content increased the Ca/Si ratio of C(N)ASH, leading to a further refined microstructure with reduced porosity. As w/p ratio decreased from 0.27 to 0.22, the compressive strength significantly increased but the tensile ductility slightly decreased. Notably, a strong linear relationship was observed between fiber-bridging strength and the average elastic modulus of matrix obtained from nanoindentation. The study provided an avenue to produce SH-AAFSC towards ultra-high compressive strength and tensile ductility, which are promising for resilient and sustainable infrastructures. © 2022 Elsevier Ltd

Original language	English
Article number	107075
Journal	Cement and Concrete Research
Volume	165
Online published	29 Dec 2022
DOIs	https://doi.org/10.1016/j.cemconres.2022.107075
Publication status	Published - Mar 2023
Externally published	Yes

Funding

This study was supported by the Guangdong Province R&D Plan for Key Areas (No. 2019B111107002 ), and The Hong Kong Polytechnic University through the Research Institute of Land and Space (No. 1-CD7D ) and the Research Institute for Sustainable Urban Development (No. 1-BBWE ). Jian-Cong Lao and Bo-Tao Huang would like to acknowledge the support by the Hong Kong Innovation and Technology Fund (No. ITS/077/18FX ) through the Research Talent Hub.

Research Keywords

Alkali-activated composites
Alkali-activated fly ash/slag
Engineered Cementitious Composites (ECC)
Engineered Geopolymer Composites (EGC)
Geopolymer
Strain-Hardening Cementitious Composites (SHCC)
Strain-Hardening Geopolymer Composites (SHGC)
Ultra-High-Performance Geopolymer Concrete (UHPGC)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Strain-hardening alkali-activated fly ash/slag composites with ultra-high compressive strength and ultra-high tensile ductility",

abstract = "This study designed and developed strain-hardening alkali-activated fly ash/slag composites (SH-AAFSC) with both ultra-high compressive strength and ultra-high tensile ductility for the first time. The developed SH-AAFSC showed a compressive strength of 94.4–180.7 MPa and a tensile strain capacity of 8.1–9.9 %, which successfully pushed the performance envelope of alkali-activated materials. A multi-scale investigation was conducted to get an in-depth understanding of the obtained mechanical properties. Results showed that higher GGBS content increased the Ca/Si ratio of C(N)ASH, leading to a further refined microstructure with reduced porosity. As w/p ratio decreased from 0.27 to 0.22, the compressive strength significantly increased but the tensile ductility slightly decreased. Notably, a strong linear relationship was observed between fiber-bridging strength and the average elastic modulus of matrix obtained from nanoindentation. The study provided an avenue to produce SH-AAFSC towards ultra-high compressive strength and tensile ductility, which are promising for resilient and sustainable infrastructures. {\textcopyright} 2022 Elsevier Ltd",

keywords = "Alkali-activated composites, Alkali-activated fly ash/slag, Engineered Cementitious Composites (ECC), Engineered Geopolymer Composites (EGC), Geopolymer, Strain-Hardening Cementitious Composites (SHCC), Strain-Hardening Geopolymer Composites (SHGC), Ultra-High-Performance Geopolymer Concrete (UHPGC)",

author = "Jian-Cong Lao and Bo-Tao Huang and Yi Fang and Ling-Yu Xu and Jian-Guo Dai and Shah, {Surendra P.}",

year = "2023",

month = mar,

doi = "10.1016/j.cemconres.2022.107075",

language = "English",

volume = "165",

journal = "Cement and Concrete Research",

issn = "0008-8846",

publisher = "Elsevier Ltd.",

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TY - JOUR

T1 - Strain-hardening alkali-activated fly ash/slag composites with ultra-high compressive strength and ultra-high tensile ductility

AU - Lao, Jian-Cong

AU - Huang, Bo-Tao

AU - Fang, Yi

AU - Xu, Ling-Yu

AU - Dai, Jian-Guo

AU - Shah, Surendra P.

PY - 2023/3

Y1 - 2023/3

N2 - This study designed and developed strain-hardening alkali-activated fly ash/slag composites (SH-AAFSC) with both ultra-high compressive strength and ultra-high tensile ductility for the first time. The developed SH-AAFSC showed a compressive strength of 94.4–180.7 MPa and a tensile strain capacity of 8.1–9.9 %, which successfully pushed the performance envelope of alkali-activated materials. A multi-scale investigation was conducted to get an in-depth understanding of the obtained mechanical properties. Results showed that higher GGBS content increased the Ca/Si ratio of C(N)ASH, leading to a further refined microstructure with reduced porosity. As w/p ratio decreased from 0.27 to 0.22, the compressive strength significantly increased but the tensile ductility slightly decreased. Notably, a strong linear relationship was observed between fiber-bridging strength and the average elastic modulus of matrix obtained from nanoindentation. The study provided an avenue to produce SH-AAFSC towards ultra-high compressive strength and tensile ductility, which are promising for resilient and sustainable infrastructures. © 2022 Elsevier Ltd

AB - This study designed and developed strain-hardening alkali-activated fly ash/slag composites (SH-AAFSC) with both ultra-high compressive strength and ultra-high tensile ductility for the first time. The developed SH-AAFSC showed a compressive strength of 94.4–180.7 MPa and a tensile strain capacity of 8.1–9.9 %, which successfully pushed the performance envelope of alkali-activated materials. A multi-scale investigation was conducted to get an in-depth understanding of the obtained mechanical properties. Results showed that higher GGBS content increased the Ca/Si ratio of C(N)ASH, leading to a further refined microstructure with reduced porosity. As w/p ratio decreased from 0.27 to 0.22, the compressive strength significantly increased but the tensile ductility slightly decreased. Notably, a strong linear relationship was observed between fiber-bridging strength and the average elastic modulus of matrix obtained from nanoindentation. The study provided an avenue to produce SH-AAFSC towards ultra-high compressive strength and tensile ductility, which are promising for resilient and sustainable infrastructures. © 2022 Elsevier Ltd

KW - Alkali-activated composites

KW - Alkali-activated fly ash/slag

KW - Engineered Cementitious Composites (ECC)

KW - Engineered Geopolymer Composites (EGC)

KW - Geopolymer

KW - Strain-Hardening Cementitious Composites (SHCC)

KW - Strain-Hardening Geopolymer Composites (SHGC)

KW - Ultra-High-Performance Geopolymer Concrete (UHPGC)

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U2 - 10.1016/j.cemconres.2022.107075

DO - 10.1016/j.cemconres.2022.107075

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85145018179

SN - 0008-8846

VL - 165

JO - Cement and Concrete Research

JF - Cement and Concrete Research

M1 - 107075

ER -

Strain-hardening alkali-activated fly ash/slag composites with ultra-high compressive strength and ultra-high tensile ductility

Abstract

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Research Keywords

UN SDGs

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