<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The purpose of this study is to investigate the impact of recycled aggregate (RA) and sea sand (SS) replacement on fly ash (FA) slag-based geopolymer concrete (GPC). An orthogonal array design is employed to obtain the optimum mix proportions, and geopolymer mixes are prepared using slag percentages of 10%, 20%, and 30% slag in FA/slag-based GPC. Sodium hydroxide (NaOH) solution is prepared at three concentrations (8 mol/L, 12 mol/L, and 16 mol/L). The mechanical properties of the geopolymer mixes are determined based on the tensile strength, compressive strength, flexural strength, and elastic modulus. GPC is prepared using water-binder ratios of 0.3, 0.4, and 0.5 at 0%, 25%, 50%, 75%, and 100% of RA replacement. The results showed that the variation in the RA replacement ratio had little effect on the strength and elastic modulus of sea sand geopolymer concrete (SS–GPC), but it had a significant effect on river sand geopolymer concrete (RS–GPC). The RA replacement ratio also showed a noticeable change in the damage surface of the specimens. In addition, SS hinders the hydration reaction of the geopolymer in the early stage and reduces the early strength of the GPC; however, in the later stages, the effect becomes insignificant.</p>
</abstract>

The purpose of this study is to investigate the impact of recycled aggregate (RA) and sea sand (SS) replacement on fly ash (FA) slag-based geopolymer concrete (GPC). An orthogonal array design is employed to obtain the optimum mix proportions, and geopolymer mixes are prepared using slag percentages of 10%, 20%, and 30% slag in FA/slag-based GPC. Sodium hydroxide (NaOH) solution is prepared at three concentrations (8 mol/L, 12 mol/L, and 16 mol/L). The mechanical properties of the geopolymer mixes are determined based on the tensile strength, compressive strength, flexural strength, and elastic modulus. GPC is prepared using water-binder ratios of 0.3, 0.4, and 0.5 at 0%, 25%, 50%, 75%, and 100% of RA replacement. The results showed that the variation in the RA replacement ratio had little effect on the strength and elastic modulus of sea sand geopolymer concrete (SS–GPC), but it had a significant effect on river sand geopolymer concrete (RS–GPC). The RA replacement ratio also showed a noticeable change in the damage surface of the specimens. In addition, SS hinders the hydration reaction of the geopolymer in the early stage and reduces the early strength of the GPC; however, in the later stages, the effect becomes insignificant.

Effect of sea sand and recycled aggregate replacement on fly ash/slag-based geopolymer concrete

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering

Shenzhen Durability Centre for Civil Engineering, College of Civil and Transportation Engineering

School of Civil and Environmental Engineering

Department of Construction Technology and Management

Hawassa University Institute of Technology

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The purpose of this study is to investigate the impact of recycled aggregate (RA) and sea sand (SS) replacement on fly ash (FA) slag-based geopolymer concrete...

Effect of sea sand and recycled aggregate replacement on fly ash/slag-based geopolymer concrete

Pubblicato online: 20 apr 2022

Pagine: 580 - 598

Ricevuto: 23 gen 2022

Accettato: 20 feb 2022

DOI: https://doi.org/10.2478/msp-2021-0049

Parole chiave
geopolymer concrete, recycled aggregate, sea sand, mechanical properties, microstructure, fly ash

© 2022 Weiwen Li et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Effect of sea sand and recycled aggregate replacement on fly ash/slag-based geopolymer concrete

Pubblicato online: 20 apr 2022

Pagine: 580 - 598

Ricevuto: 23 gen 2022

Accettato: 20 feb 2022

DOI: https://doi.org/10.2478/msp-2021-0049

Parole chiavegeopolymer concrete, recycled aggregate, sea sand, mechanical properties, microstructure, fly ash

© 2022 Weiwen Li et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Parole chiave
geopolymer concrete, recycled aggregate, sea sand, mechanical properties, microstructure, fly ash