Development of highly reactive partially calcined dolomite precursor: Synergistic effect CaO and MgO

Journal of the American Ceramic Society, Journal Year: 2025, Volume and Issue: unknown

Published: April 2, 2025

Abstract This study introduces a novel rapid calcination method for partially calcined dolomite (PCD) precursors, offering transformative approach to sustainable cementitious materials. Unlike traditional partial calcination, which involves prolonged thermal treatment, this process (0–5 min) minimizes energy consumption and CO₂ emissions by leveraging the distinct decomposition kinetics of MgCO 3 CaCO . method's tailored Mg/Ca ratio significantly enhances hydration kinetics, producing core‐shell microstructure that synergistically balances early strength long‐term durability. Thermodynamic modeling experimental analyses reveal is dominated CaO, forming calcium silicate hydrate (C‐S‐H). In contrast, gradual MgO supports stability through magnesium (M‐S‐H) hydrotalcite phases. provides scalable pathway upcycling low‐grade into high‐performance materials, solution construction industry.

Language: Английский

Unlocking the Potential of Dolomite for Developing More Sustainable Cementitious Materials through Partial Calcination

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(44), P. 16378 - 16387

Published: Oct. 21, 2024

Waste dolomite powder, a widely available industrial byproduct, has recently gained attention as potential supplementary cementitious material. However, its inert reactivity challenges for substantial cement replacement. This study explores the effectiveness of partially calcined (PCD) integrated with clay high substitution level. A novel partial calcination method is introduced to optimize decomposition MgCO3 and CaCO3 produce core–shell structure highly reactive external CaO/MgO layer dense internal core MgO. configuration significantly enhances formation calcium silicate hydrate gels carboaluminate phases, improving overall strength material by over 90% at both 7 28 days compared sample uncalcined dolomite. Additionally, formulation proposed materials reduces CO2 emission 43% energy consumption 47% without sacrificing compressive strength. innovative technique broadens application waste in development sustainable materials.

Language: Английский

Boosting MgO Hydration through Sodium Bicarbonate: Enhancing the Strength of MgO-Calcined Clay Cementitious Materials

Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 98, P. 111279 - 111279

Published: Nov. 7, 2024

Language: Английский