Wan Jun, Wang Caisen, Liang Jiongfeng, Wang Yunchen
College of Architecture Engineering, Jiangxi Science and Technology Normal University, Nanchang, China.
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, China.
PLoS One. 2025 Jun 30;20(6):e0326925. doi: 10.1371/journal.pone.0326925. eCollection 2025.
To promote the sustainable utilization of industrial solid wastes in concrete applications, this study systematically investigates the combined use of lithium slag (LS) as a cement replacement and recycled fine aggregates (RFA) as a substitute for river sand (RS). Through experimental analysis with a fixed water-cement ratio (0.46), we evaluated the effects of varying LS content (0-40%) and RFA replacement rates (0-30%) on concrete performance. The results indicate that the optimal LS incorporation (20%) enhances compressive strength, splitting tensile strength, and flexural strength by 12.7%, 11.9%, and 9.16%, respectively, while maintaining adequate workability. In contrast, RFA addition caused a linear reduction in mechanical properties, with 30% RFA leading to a 19.07% decrease in compressive strength. However, the addition of LS effectively mitigated the performance losses induced by RFA, providing a compensatory effect. The conversion formulas established between cubic compressive strength and other mechanical parameters demonstrated high correlation coefficients, offering practical guidelines for lithium slag-recycled fine aggregate concrete (LSRFAC) applications. This dual-waste utilization strategy presents an environmentally responsible solution for construction material innovation, addressing both the recycling of industrial byproducts and the conservation of natural resources. Overall, this study provides a sustainable approach to concrete production by reducing environmental burdens and supporting the circular use of industrial and construction waste in structural engineering.
为促进工业固体废弃物在混凝土应用中的可持续利用，本研究系统地研究了锂渣（LS）作为水泥替代品与再生细骨料（RFA）替代河砂（RS）的联合使用情况。通过在固定水灰比（0.46）下的实验分析，我们评估了不同锂渣含量（0 - 40%）和再生细骨料替代率（0 - 30%）对混凝土性能的影响。结果表明，最佳锂渣掺入量（20%）可分别提高抗压强度、劈裂抗拉强度和抗弯强度12.7%、11.9%和9.16%，同时保持足够的工作性。相比之下，添加再生细骨料会导致力学性能呈线性下降，30%的再生细骨料导致抗压强度下降19.07%。然而，锂渣的添加有效地减轻了再生细骨料引起的性能损失，起到了补偿作用。建立的立方体抗压强度与其他力学参数之间的换算公式显示出高相关系数，为锂渣 - 再生细骨料混凝土（LSRFAC）的应用提供了实用指导。这种双废弃物利用策略为建筑材料创新提供了一种环境友好型解决方案，既解决了工业副产品的回收问题，又保护了自然资源。总体而言，本研究通过减轻环境负担并支持工业和建筑废弃物在结构工程中的循环利用，为混凝土生产提供了一种可持续的方法。
