Development and applications of MgO-activated SiO₂ system—achieving a low carbon footprint: A review

Abstract

The MgO-activated SiO₂ system demonstrates potential for a low carbon footprint throughout its lifecycle and is characterized by favorable mechanical properties, low alkalinity, and a high specific surface area, which shows promise in replacing traditional silicate cement in certain applications. The current system faces challenges such as slow early hydration rate, low early strength, and inadequate volume stability, which impede its further development and application. The MgO-activated SiO₂ system was improved and optimized through multiple tests using carbonation (CO₂ gas/NaHCO₃ solution), nanomaterials (whiskers), and fiber (organic/inorganic fiber) composite reinforcement. This paper provides an overview of the hydration mechanism of the MgO-activated SiO₂ system, explores modifications and control measures based on this mechanism, and discusses the potential applications and future development of the MgO-activated SiO₂ system.

Keywords

MgO-activated SiO₂ / Low carbon / Application

Funding

This work was funded by The National Natural Science Foundation of China (No.52178189); The Natural Science Foundation of Hebei Province (NO. E2022209155); Hebei Province "three three three talent project" project (C20231109), Tangshan Key R&D Plan Project (23150217A); Key R&D projects of North China University of Science and Technology (ZD-ST-202301).

CRediT authorship contribution statement

Yuan Jia: Conceptualization, Investigation, Methodology, Writing - original draft, Writing - review & editing. Jingbin Zhang: Investigation, Writing - original draft, Writing - review & editing. Yuxin Zou: Writing - original draft, Writing - review & editing. Qun Guo: Writing - review & editing. Min Li: Writing - original draft. Tingting Zhang: Conceptualization, Funding acquisition, Supervision, Writing - review & editing. Chris Cheeseman: Conceptualization, Supervision, Writing - review & editing.

Declaration of competing interest

No conflict of interest exits in the submission of this manuscript, and manuscript is approved by all authors for publication. I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.

We confirm that there are no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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