The utilization of coal gangue in limestone calcined clay cement (LC3) has been limited by its relatively low activity and poor carbonation resistance. This research evaluates the effects of adding Ca(OH)2 and gypsum to enhance the carbonation resistance and mechanical properties of coal gangue-based LC3. Coal gangue-based LC3 with 60 % coal gangue replacement exhibits limited carbonation resistance, with a carbonation depth of 19.3 mm and a post-carbonation compressive strength of 20.4 MPa. However, with the incorporation of 7.15 % Ca(OH)2 and 10 % gypsum, the carbonation depth reduces to 17.0 mm and the compressive strength increases to 31.9 MPa. In the composite with 30 % coal gangue, the addition of 20 % gypsum results in a carbonation depth of 10 mm and a compressive strength of 39.3 MPa. These findings provide crucial insights for the optimization and industrial application of sustainable cement materials.

中文翻译：

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使用 Ca（OH）₂ 和石膏添加剂增强低活性煤矸石基 LC3 胶凝材料的抗碳化性


煤矸石在石灰石煅烧粘土水泥 （LC3） 中的利用受到其活性相对较低和抗碳化性差的限制。本研究评估了添加 Ca（OH）2 和石膏对增强煤矸石基 LC3 的抗碳化性和机械性能的影响。替代 60% 煤脉石的煤脉石基 LC3 表现出有限的抗碳化性，碳化深度为 19.3 mm，碳化后抗压强度为 20.4 MPa。然而，随着 7.15 % Ca（OH）2 和 10 % 石膏的加入，碳化深度减少到 17.0 mm，抗压强度增加到 31.9 MPa。在含有 30% 煤矸石的复合材料中，添加 20% 石膏后，碳化深度为 10 mm，抗压强度为 39.3 MPa。这些发现为可持续水泥材料的优化和工业应用提供了重要见解。