Acid activated smectite clay as pozzolanic supplementary cementitious material

Article

Ayati, B., Newport, D., Wong, H. and Cheeseman, C. 2022. Acid activated smectite clay as pozzolanic supplementary cementitious material. Cement and Concrete Research. 162 (Art. 106969). https://doi.org/10.1016/j.cemconres.2022.106969
AuthorsAyati, B., Newport, D., Wong, H. and Cheeseman, C.
Abstract

This research has investigated the structural changes and pozzolanic activity produced in acid activated smectite clay. The activation treatment used HCl at different concentrations, using different times and at a range of temperatures. X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy were used to determine the acid dissolution mechanism and characterise the activated clay mineral structure. Acid activation causes dehydroxylation of smectite clay, followed by leaching of octahedral cations. This results in the formation of a silica-rich amorphous phase that exhibits substantial pozzolanic activity compared to the same clay sample that had undergone calcining treatment at 850. The optimum sample was activated for 8 h using 5 M HCl at 90 °C. This was 93 % amorphous. Mortar prisms prepared with 25 % replacement of Portland cement by acid activated smectite produced 93 % compressive strength of plain Portland cement mortar.

KeywordsCalcined clays; Pozzolans; Low-carbon cement; Supplementary cementitious materials
JournalCement and Concrete Research
Journal citation162 (Art. 106969)
ISSN0008-8846
Year2022
PublisherElsevier
Publisher's version
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Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cemconres.2022.106969
Publication dates
Online14 Sep 2022
Publication process dates
Accepted06 Sep 2022
Deposited23 Sep 2022
Copyright holderCrown Copyright © 2022
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