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Qiusong Chen, Chao Zhang, Daolin Wang, Yikai Liu, and Chongchong Qi, Carbon sequestration potential and mechanisms of shotcrete for tunnel support in underground metal mines through cement hydration, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3036-z
Qiusong Chen, Chao Zhang, Daolin Wang, Yikai Liu, and Chongchong Qi, Carbon sequestration potential and mechanisms of shotcrete for tunnel support in underground metal mines through cement hydration, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3036-z
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喷射混凝土在地下金属矿山隧道支护中水泥水化固碳的潜力及机理

摘要: 随着对地下开采过程中温室气体排放问题的日益关注,在各生产环节实施碳减排策略变得尤为重要。作为隧道支护广泛使用的喷射混凝土,在CO2减排方面展现出显著潜力。本研究调查了矿山支护过程中不同CO2浓度环境下喷射混凝土的碳吸收能力、力学性能及其作用机制。结果表明,在碳化养护初期提高CO2浓度可促进早期强度发展,但可能影响长期强度。在2 vol% CO2浓度下养护14天的喷射混凝土试件,其碳化速率约为0.03 vol% CO2浓度下的三倍。微观结构分析证实了碳化层的形成,CO2以稳定碳酸盐的形式被永久封存。理想条件下,地下回风巷道中的喷射混凝土衬砌在14天内每平方米可吸收1.1 kg CO2,相当于净化33 m³的含CO2污染空气。这些发现表明,在回风巷道中采用CO2强化喷射混凝土养护技术可有效促进减排,推动矿业向环境可持续发展方向迈进。

 

Carbon sequestration potential and mechanisms of shotcrete for tunnel support in underground metal mines through cement hydration

Abstract: Growing concerns about greenhouse gas emissions from underground mining have intensified the need for carbon reduction strategies at every stage. Shotcrete used in tunnel support presents a promising opportunity for carbon emission reduction. This study investigates the carbon absorption capacity, mechanical strength, and underlying mechanisms of shotcrete when exposed to varying CO2 concentrations during the mine support process. Findings reveal that higher CO2 concentrations during the initial stages of carbonation curing enhance early strength but may impede long-term strength development. Shotcrete samples exposed to 2vol% CO2 for 14 days exhibited a carbonation degree approximately three times higher than those exposed to 0.03vol% CO2. A carbonation layer formed in the shotcrete, sequestering CO2 as solid carbonates. In practical terms, shotcrete in an underground return-air tunnel absorbed 1.1 kg·m2 of CO2 over 14 days, equivalent to treating 33 m3 of contaminated air. Thus, using shotcrete for CO2 curing in return-air tunnels can significantly reduce carbon emissions, contributing to greener and more sustainable mining practices.

 

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