Project Overview: Low CO2 Emission Magnesium-Based Cement with Supplementary Cementitious Materials (SCMs)

Traditional calcium based cement production is a major contributor to global CO2 emissions, making the need for greener alternatives more urgent than ever. Magnesium-carbonates based cement, due to its lower carbon footprint, presents a promising solution. This project focuses on developing low CO2 emission magnesium-based cement, particularly Mg-carbonate binders such as MgO/Hydromagnesite and MgO/Nesquehonite mixes. However, to optimize its performance and sustainability, we are investigating the incorporation of Supplementary Cementitious Materials (SCMs), which are industrial by-products or waste materials rich in silicon (Si) and aluminum (Al).

Research Focus: Enhancing MgO/Nesquehonite Binders with SCMs

This research explores the effects of various SCMs on the properties of Mg-carbonate cement. By blending different SCMs and waste products, such as amorphous silica, metakaolin and other Si or Al-rich materials, with MgO/Nesquehonite mixes, we aim to determine which combinations yield the most sustainable, durable and low-emission cementitious materials. The research scope is mainly on hydration study, solid and liquid phase analysis, thermodynamic modelling and mechanical testing on mortars

Objective: Optimizing Sustainability and Material Efficiency

The ultimate objective of this project is to assess the suitability of different SCMs for blending with Mg-carbonate binders. By optimizing these blends, we seek to create a high-performance, eco-friendly cement that maximizes the use of available materials while minimizing waste. This research could lead to significant advancements in sustainable construction, offering a wide range of suitable Si and Al-rich SCMs to enhance Mg-carbonate based binder that aligns with global efforts to reduce carbon emissions and promote circular economy principles.

Contact: Zeyu Zhou, Ellina Bernard, Barbara Lothenbach

Publications:

Links:

Low carbon magnesium based binders (snf.ch)

Empa - Concrete & Asphalt - Cement Chemistry and Thermodynamics