Journal article

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

Z Zhou, M Sofi, Y Sabri, J Liu, S Kang, P Mendis

Journal of Materials in Civil Engineering | American Society of Civil Engineers (ASCE) | 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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