Effect of further water curing on properties of carbonated reactive magnesia cement

被引：0

作者：

Li, Zhen ^{[1
]}

Liu, Yujie ^{[2
]}

Hua, Ying ^{[2
]}

Zhang, Zhichao ^{[2
]}

Huang, Yongbo ^{[1
]}

Qian, Jueshi ^{[2
]}

机构：

[1] Shandong Provincial Key Lab. of Preparation and Measurement of Building Materials, University of Jinan, Jinan,250022, China

[2] College of Materials Science and Engineering, Chongqing University, Chongqing,400045, China

来源：

Journal of Building Engineering | 2025年 / 100卷

关键词：

Portland cement;

D O I：

10.1016/j.jobe.2024.111700

中图分类号：

学科分类号：

摘要：

It has been confirmed that the mechanical properties of carbonated Portland cement (PC) in water condition could be further improved, while the strength, volume stability and phase changes of carbonated reactive magnesia cement (RMC) in water are still unclear. This study investigates the performance of carbonated reactive magnesia cement (CRMC) under further water curing. The CRMCs with different carbonation degrees were prepared and then cured in water. The compressive strength and dimensional changes of RMC before and after water curing were measured. Changes in phases and microstructures of CRMC were analyzed through XRD, FTIR, TGA and SEM tests. The results showed that short periods of carbonation curing followed by water curing is a more effective way to improve RMC strength than carbonation curing alone. The expansion caused by the hydration of residual MgO during water curing process does not exceed 700 μm/m as formation of sufficient hydrated magnesium carbonates. The amounts of MgO and nesquehonite in CRMC was found to be reduced during water curing. Amorphous magnesium carbonate phase was speculated as the reaction product of nesquehonite and MgO, resulting in densified microstructure, reduced shrinkage, improved strength and an almost unchanged CO2 sequestration factor. An appropriate amount of unhydrated MgO is beneficial to the water stability of carbonated RMC. © 2024 Elsevier Ltd

引用

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