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Microstructure and strength development of quaternary blend high-volume fly ash concrete

journal contribution
posted on 2024-11-02, 12:10 authored by Madurapperumage Chamila GunasekaraMadurapperumage Chamila Gunasekara, Zhiyuan Zhou, David LawDavid Law, Massoud Sofi, Sujeeva SetungeSujeeva Setunge, Priyan Mendis
This study investigates low cement quaternary blend HVFA concrete mixes utilizing up to 80% cement replacement using fly ash, hydrated lime and nano-silica. The optimized concrete mixes achieved a compressive strength of 55 MPa and 48 MPa, for HVFA-65 and HVFA-80 concretes, respectively. Additional fly ash and hydrated lime dosage in HVFA concrete increased the rate of hydration of the C3A and C4AF phases but decreased the hydration of the C3S phase. This resulted in lower early age strength development in the HVFA concrete than occurs in PC concrete but significantly higher than for fly ash and hydrated lime alone. The addition of the nano-silica resulted in an increase in C–S–H gel incorporation of tetrahedrally coordinated aluminium (AlIV) into the HVFA concrete and the substitution of Si by Al in the C–S–H gel, leading to an increase in compressive strength in the HVFA concrete. Early age carbonation was increased with a higher of fly ash percentage. However, the reaction products dissolved in the pore water to form calcium bicarbonate with time.

Funding

Stopping post-tensioned anchorage zone concrete failures

Australian Research Council

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ARC Research Hub for Nanoscience-based Construction Material Manufacturing

Australian Research Council

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History

Journal

Journal of Material Science

Volume

55

Start page

6441

End page

6456

Total pages

16

Publisher

Springer

Place published

Netherlands

Language

English

Copyright

© Springer Science+Business Media, LLC, part of Springer Nature 2020

Former Identifier

2006097485

Esploro creation date

2020-06-22

Fedora creation date

2020-04-21

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