Performance and microstructure of MgO-SiO2 concrete under different environments

Performance and microstructure of MgO-SiO2 concrete under different environments

This study investigated the changes in the performance and microstructure of MgO-SiO2 concrete under exposure to different environments involving carbonation, NaCl, MgCl2 and MgSO4 solutions for up to 180 days. Compressive strength results were compared to Portland cement (PC)-based concrete samples...

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Bibliographic Details
Main Authors: Sonat, Cem, Teo, W. W., Unluer, Cise
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2020
Subjects:
Engineering::Civil engineering
MgO
SiO2
Online Access:https://hdl.handle.net/10356/137102
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Institution: Nanyang Technological University
Language: English
Description
Summary:This study investigated the changes in the performance and microstructure of MgO-SiO2 concrete under exposure to different environments involving carbonation, NaCl, MgCl2 and MgSO4 solutions for up to 180 days. Compressive strength results were compared to Portland cement (PC)-based concrete samples subjected to the same environments. Microstructural analysis performed via FESEM, XRD and TG/DTG indicated a lack of change in the composition of MgO-SiO2 samples. The sustained mechanical performance and the clear presence of hydrate phases such as brucite and M-S-H even after longer exposures highlighted the resistance of MgO-SiO2 formulations and their potential to be utilized in structural applications.

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