Journal article

Microstructural Investigation of High-Volume Fly Ash Composites Containing Nano-Calcium Silicate Hydrate Crystals

Zhiyuan Zhou, Massoud Sofi, Ylias Sabri, Junli Liu, Shaobo Kang, Priyan Mendis

JOURNAL OF MATERIALS IN CIVIL ENGINEERING | ASCE-AMER SOC CIVIL ENGINEERS | Published : 2021

Abstract

This paper reports on the effect of addition of nano-calcium silicate hydrate (nano-CSH) seeds on the early-age strength development and microstructural evolution of concrete containing high-volume fly ash (HVFA). Cement replacement levels of 60% and 70% are considered. For each of the replacement levels, 0.5%, 1%, and 1.5% of the mass of fly ash (FA) are replaced with nano-CSH crystals. The early-age compressive strength of concrete was tested at the ages of 1, 3, 7, 14, and 28 days. Microstructural investigations involve thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results show that addition of 1% and 1.5% nan..

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Grants

Awarded by Australian Research Council


Funding Acknowledgements

All of the authors would like to acknowledge the financial support from the Melbourne Research Scholarship offered by the University of Melbourne and the Australian Research Council's Discovery Early Career Researcher Grant (Nos. DE170100165 and DE 2017 R1). We would like to thank Cement Australia and BASF Australia for offering the material and concrete admixture for experimental programs. We also would like to express our gratitude for Laura Jukes's help with part of the experimental preparation.