@article{Xu2025, 
author = {Xin Xu and Jinhui Liu and Yuandong Mu and Yixin Zhang and Yuming Zhao and Peixu Yang and Weidong Zhang and Xiaofeng Li and Yong Hu and Weineng Tang and Jiajia Tian and Zhongtao Luo and Shaojun Zhang},
title = {Effect of pre-autoclaving treatment on volume stability and compressive strength of carbonated magnesium slag},
year = {2025},
journal = {Journal of Magnesium and Alloys},
volume = {13},
number = {11},
pages = {5637-5651},
keywords = {Magnesium slag, Volume stability, Pre-autoclaving, Hydration, Carbonation},
url = {https://www.sciopen.com/article/10.1016/j.jma.2024.12.016},
doi = {10.1016/j.jma.2024.12.016},
abstract = {The primary magnesium production is accompanied by a large amount of magnesium slag (MS) discharge. The low hydration reactivity of γ-Ca2SiO4 (γ-C2S) and MgO in MS results in the volume stability issue and low utilization rate of MS. To eliminate the issue, this study proposes to pre-autoclave the MS slurry to boost the hydration of γ-C2S and MgO and then utilize their hydration products to prepare cementitious materials by carbonation curing. MgO from MS and prepared γ-C2S are firstly employed as study objects respectively, for they are the main contents of magnesium slag. The results indicate that pre-autoclaving treatment can strongly elevate the hydration degree of MgO from MS, this can substantially solve the volume stability issue of MS. Meanwhile, the pre-autoclaving of γ-C2S induces the generation of crystallized and amorphous C-S-H products, and both products could promote the carbonation reaction when compared to γ-C2S. The carbonation degree of pre-autoclaved MS firstly increases and then decreases with the rising pre-autoclaving temperature, and the optimal pre-autoclaving temperature for MS carbonation is 160 °C, at this time, the powdered MS can be simply carbonated fully. The sample made of pre-autoclaved MS and then subjected to 4 h carbonation could achieve the compressive strength of 29 MPa. with good soundness. During volume stability testing, the volume expansion rate of a carbonated MS sample with pre-autoclaving was 0.07%, which is significantly lower than the normal requirement of 0.5%. This research offers a novel approach to utilizing magnesium slag in building materials and contributes to carbon reduction.}
}