Work

Factors influencing the micro-mechanical properties of MgO-SiO2 pastes

Year: 2025

Type: article

Abstract: MgO-based cements represent a promising, low-CO 2 alternative to traditional Portland cement. In magnesium silicate cements, M-S-H is the main phase. Although the thermodynamic properties and hydration mechanisms of this phase have been investigated, studies on its mechanical behaviour remain limited. This study aimed to determine the factors influencing the micro-mechanical properties of the MgO-SiO 2 pastes. Detailed chemical (X-ray diffraction, Thermogravimetric analysis, Energy-dispersive spectrometry analysis), microstructural (water porosity), and mechanical (indentation) analyses were conducted. The source of raw materials and the production protocol (mortar mixer, ball mill, pressing) influence the mineralogy of pastes and silicon distribution. Additives have a moderate impact on the mineralogy of pastes. Samples with the lowest porosity exhibit the highest elastic properties. Once the effect of porosity is accounted for, a higher brucite content correlates with increased elastic properties.

Source: Cement and Concrete Research

DOI: 10.1016/j.cemconres.2025.108098

Authors: Charlotte Dewitte, Mateusz Wyrzykowski, Ellina Bernard

Institutions: Autorité de sûreté nucléaire et de radioprotection, Swiss Federal Laboratories for Materials Science and Technology

Language: English

Topic: Magnesium Oxide Properties and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $5,180

Funders: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Institut de Radioprotection et de SÛreté Nucléaire