Imperial College London
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Professor Hong S. Wong

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Concrete Materials
 
 
 
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Contact

 

+44 (0)20 7594 5956hong.wong Website

 
 
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Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
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Location

 

228DSkempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ayati:2022:10.1016/j.cemconres.2022.106969,
author = {Ayati, B and Newport, D and Wong, H and Cheeseman, C},
doi = {10.1016/j.cemconres.2022.106969},
journal = {Cement and Concrete Research},
pages = {1--8},
title = {Acid activated smectite clay as pozzolanic supplementary cementitious material},
url = {http://dx.doi.org/10.1016/j.cemconres.2022.106969},
volume = {162},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Ayati,B
AU  - Newport,D
AU  - Wong,H
AU  - Cheeseman,C
DO  - 10.1016/j.cemconres.2022.106969
EP  - 8
PY  - 2022///
SN  - 0008-8846
SP  - 1
TI  - Acid activated smectite clay as pozzolanic supplementary cementitious material
T2  - Cement and Concrete Research
UR  - http://dx.doi.org/10.1016/j.cemconres.2022.106969
UR  - https://www.sciencedirect.com/science/article/pii/S0008884622002617?via%3Dihub
UR  - http://hdl.handle.net/10044/1/99656
VL  - 162
ER  -
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