Faculty of Civil & Architecture Engineering, East China University of Technology, Nanchang, P.R. China.
College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, P.R. China.
PLoS One. 2024 Apr 18;19(4):e0302176. doi: 10.1371/journal.pone.0302176. eCollection 2024.
As one of the key materials used in the civil engineering industry, concrete has a global annual consumption of approximately 10 billion tons. Cement and fine aggregate are the main raw materials of concrete, and their production causes certain harm to the environment. As one of the countries with the largest production of industrial solid waste, China needs to handle solid waste properly. Researchers have proposed to use them as raw materials for concrete. In this paper, the effects of different lithium slag (LS) contents (0%, 10%, 20%, 40%) and different substitution rates of recycled fine aggregates (RFA) (0%, 10%, 20%, 30%) on the axial compressive strength and stress-strain curve of concrete are discussed. The results show that the axial compressive strength, elastic modulus, and peak strain of concrete can increase first and then decrease when LS is added, and the optimal is reached when the LS content is 20%. With the increase of the substitution rate of RFA, the axial compressive strength and elastic modulus of concrete decrease, but the peak strain increases. The appropriate amount of LS can make up for the mechanical defects caused by the addition of RFA to concrete. Based on the test data, the stress-strain curve relationship of lithium slag recycled fine aggregate concrete is proposed, which has a high degree of agreement compared with the test results, which can provide a reference for practical engineering applications. In this study, LS and RFA are innovatively applied to concrete, which provides a new way for the harmless utilization of solid waste and is of great significance for the control of environmental pollution and resource reuse.
作为土木工程行业中使用的关键材料之一，混凝土的全球年消耗量约为 100 亿吨。水泥和细骨料是混凝土的主要原料，它们的生产对环境造成了一定的危害。作为工业固体废弃物产量最大的国家之一，中国需要妥善处理固体废物。研究人员提出将它们用作混凝土的原材料。本文探讨了不同锂渣（LS）含量（0%、10%、20%、40%）和不同再生细骨料（RFA）取代率（0%、10%、20%、30%）对混凝土轴向抗压强度和应力-应变曲线的影响。结果表明，随着 LS 的加入，混凝土的轴向抗压强度、弹性模量和峰值应变先增加后减小，当 LS 含量为 20%时达到最佳值。随着 RFA 取代率的增加，混凝土的轴向抗压强度和弹性模量降低，但峰值应变增加。适量的 LS 可以弥补 RFA 对混凝土力学性能的缺陷。基于试验数据，提出了锂渣再生细骨料混凝土的应力-应变曲线关系，与试验结果具有很高的吻合度，可为实际工程应用提供参考。本研究创新性地将 LS 和 RFA 应用于混凝土中，为固体废物的无害化利用提供了新途径，对环境污染控制和资源再利用具有重要意义。
