Effect of Carbon Dioxide Concentration on Performance of Low-Calcium Carbon Sequestration Cementitious Materials and Its Mechanism

Abstract

Abstract: In order to achieve the national strategic goals of “peak carbon dioxide emission and carbon neutrality” in the building materials industry, a type of low-calcium carbon sequestration cementitious materials (LC-CSCM) was prepared by calcining industrial calcareous and siliceous raw materials at 1 350 ℃. The influences of different concentrations of CO₂ on the carbonation degree and the carbonation hardening performance of LC-CSCM were investigated. XRD, FT-IR, TG, SEM and EPMA were used for the evolution of product analysis, microanalysis and mechanism analysis of carbonated LC-CSCM. The results show that with the increase of CO₂ concentration, the carbonation degree and the carbonation hardening performance of LC-CSCM increase significantly. When the CO₂ concentration is 99.99% (volume fraction), the compressive strength reaches 132.2 MPa after 8 h of LC-CSCM carbonation curing; compared with the concentration CO₂ of 25%, the compressive strength increases by 260%.

Key words: low-calcium carbon sequestration cementitious material, carbon dioxide concentration, calcium carbonate, carbonation degree, compressive strength

CLC Number:

TQ172

LI Shuai, ZHOU Fengjiao, TAN Xinyu, ZHANG Bin, LIN Yongquan, TAO Congxi, HUANG Mingjun. Effect of Carbon Dioxide Concentration on Performance of Low-Calcium Carbon Sequestration Cementitious Materials and Its Mechanism[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3109-3116.

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