Work

Carbonated waste paste calcined clay cement with enhanced CO2 mineralization and early strength

Year: 2024

Type: article

Abstract: Modern concrete offers a significant potential for carbon capture, utilization and storage due to their alkaline nature. Herein, we combine the CO 2 mineralization in the waste cement paste (WCP) with calcined clay cement to develop a novel low-carbon cement—carbonated waste paste calcined clay cement (CWPC 3 ). Our results suggest that 1 kg WCP efficiently mineralizes ∼0.27 kg CO 2 within 2 h, and together produces amorphous silica-alumina gel. This carbonated WCP promotes early hydration and strength development due to its high pozzolanic reactivity. Compared with conventional limestone calcined clay cement (LC 3 ), CWPC 3 has higher early strength and lower embodied carbon. Our work provides a synchronized solution to treat WCP while reducing embodied carbon in construction materials.

Source: Carbon Capture Science & Technology

DOI: 10.1016/j.ccst.2024.100343

Authors: Qing Liu, Yu Yan, Yuchen Hu, Qiang You, Guoqing Geng

Institution: National University of Singapore

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Climate action

Open Access status: gold

Estimated APC paid: $2,000