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Is It Possible to Make Magnesia-Based Cement Environmentally Friendly? | LitMetric

Is It Possible to Make Magnesia-Based Cement Environmentally Friendly?

ACS Sustain Chem Eng

Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom.

Published: November 2024

AI Article Synopsis

  • - This paper evaluates the environmental impact of magnesia-based cements using a life cycle assessment approach, focusing on four types of MgO and ten magnesia-based cements.
  • - Results show that using Salt Lake magnesium residue in MgO production can cut CO emissions by over 60% compared to traditional methods, and incorporating alternative materials like fly ash can further reduce emissions by 16-45% in certain cements.
  • - Among the cements studied, carbonation-reactive magnesium cement (CRMC) emerged as the most eco-friendly option, achieving a very low overall environmental impact indicator of 0.00078.

Article Abstract

Magnesia-based cement is recognized for its outstanding mechanical properties, but its environmental impact has not been thoroughly evaluated. This paper employs a comprehensive life cycle assessment methodology to systematically analyze the environmental effects of four kinds of MgO and 10 kinds of magnesia-based cements based on the data in the literature. The impacts include CO emissions, fossil fuel depletion potential, and overall environmental impact indicators. The results indicate that using Salt Lake magnesium residue to prepare MgO, e.g., LB-MgO and DB-MgO, can reduce over 60% of CO emissions, compared with traditional MgO (e.g., L-MgO and D-MgO) prepared with magnesite. Utilizing supplementary cementitious materials (e.g., fly ash and ground granulated blast-furnace slag) as substitutes for clinker in basic sulfate magnesium cement (BMSC) and magnesium phosphate potassium cement (MKPC) can also reduce approximately 16 and 45% of carbon emissions, respectively. In addition, carbonation-reactive magnesium cement (CRMC), which involves carbonation curing and replacing traditional MgO with Salt Lake magnesium residue, is the most environmentally friendly magnesia-based cement with an overall environmental impact indicator of 0.00078.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11577429PMC
http://dx.doi.org/10.1021/acssuschemeng.4c05985DOI Listing

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