Influences of CO2-cured cement powders on hydration of cement paste

Yukun Kong, Yufeng Song, Yiwei Weng, Kiyofumi Kurumisawa, Dongming Yan, Xiangming Zhou, Su Wang, Shaoqin Ruan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Carbonated cement pastes (CCP) can be used as stable carbon storage. In this work, CCP were systematically investigated as supplementary cementitious materials (SCMs)-like components used in ordinary Portland cement (OPC) paste. The fully hydrated cement pastes were pulverized into powders and then exposed to different CO2 pressure conditions (i.e., 1.0, 2.0 and 2.5 MPa) for 24 h. These CCP powders were then mixed with OPC to form a new binder. Various fresh, hardened and microstructural properties of CCP powders and the mixtures were investigated. Initial results show that the CO2 sequestration level of CCP increased with the growth of CO2 pressure, and albeit a pozzolanic reaction occurred inside the mixture, the relatively higher water demand due to the use of 30% replacement of CCP led to the inferior workability and compressive strength than the control group. Finally, a conceptual model relating to the CCP-OPC paste was proposed, facilitating the comprehension of the hydration behaviours of CCP-OPC paste.

Original languageEnglish
JournalGreenhouse Gases: Science and Technology
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • carbon storage
  • carbonated cement paste
  • compressive strength
  • microstructural analysis

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry

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