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Amir Reza Elahi
Laboratory of Concrete Technology, Civil Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran.
Civil Engineering, Building, Construction & Architecture

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Journal : Civil Engineering Journal

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Effect of Activated Pozzolan with Ca(OH) 2 and nano-SiO2 on Microstructure and Hydration of High-Volume Natural Pozzolan Paste Mohammad Shakiba; Peyman Rahgozar; Amir Reza Elahi; Reza Rahgozar
Civil Engineering Journal Vol 4, No 10 (2018): October
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2170.749 KB) | DOI: 10.28991/cej-03091171

Abstract

The main aim of this study is to investigate the effect of activated pozzolan on hydration and microstructure of high-volume natural pozzolan paste. Thermal activation of natural pozzolan with Ca(OH)2 has been applied with nano-silica (NS) as activator at three different temperatures. X-ray diffraction (XRD), thermogravimetric analysis (TGA), laser particle analysis, scanning electron microscopy (SEM) with energy dispersive spectroscopy were employed. In order to analyze the test results, notions of “pre C-S-H” based on XRD and TGA results of activated pozzolan powders has been used. SEM images indicated microstructural improvements of the pastes with activated pozzolans compared to paste with natural pozzolan and natural pozzolan incorporating NS, showing the pore-filling effect of activated pozzolans. The microstructural improvements were proportion to the amount of pre C-S-H formed during the activation of pozzolan.
Co-Authors Mohammad Shakiba Peyman Rahgozar Reza Rahgozar