Li Weilong, Wang Hui, Liu Zhichao, Li Ning, Zhao Shaowei, Hu Shuguang
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China.
Materials (Basel). 2024 Jun 17;17(12):2968. doi: 10.3390/ma17122968.
Steel slag as an alkaline industrial solid waste, possesses the inherent capacity to engage in carbonation reactions with carbon dioxide (CO). Capitalizing on this property, the current research undertakes a systematic investigation into the fabrication of high-carbonation precast concrete (HCPC). This is achieved by substituting a portion of the cementitious materials with steel slag during the carbonation curing process. The study examines the influence of varying water-binder ratios, silica fume dosages, steel slag dosages, and sand content on the compressive strength of HCPC. Findings indicate that adjusting the water-binder ratio to 0.18, adding 8% silica fume, and a sand volume ratio of 40% can significantly enhance the compressive strength of HCPC, which can reach up to 104.9 MPa. Additionally, the robust frost resistance of HCPC is substantiated by appearance damage analysis, mass loss rate, and compressive strength loss rate, after 50 freeze-thaw cycles the mass loss, and the compressive strength loss rate can meet the specification requirements. The study also corroborates the high-temperature stability of HCPC. This study optimized the preparation of HCPC and provided a feasibility for its application in precast concrete.
钢渣作为一种碱性工业固体废弃物，具有与二氧化碳（CO₂）发生碳酸化反应的内在能力。基于这一特性，当前研究对高碳酸化预制混凝土（HCPC）的制备进行了系统研究。这是通过在碳酸化养护过程中用钢渣替代部分胶凝材料来实现的。该研究考察了不同水胶比、硅灰用量、钢渣用量和砂含量对HCPC抗压强度的影响。研究结果表明，将水胶比调整为0.18，添加8%的硅灰，砂体积比为40%，可显著提高HCPC的抗压强度，最高可达104.9MPa。此外，通过外观损伤分析、质量损失率和抗压强度损失率证实了HCPC具有较强的抗冻性，经过50次冻融循环后，质量损失和抗压强度损失率均能满足规范要求。该研究还证实了HCPC的高温稳定性。本研究优化了HCPC的制备工艺，并为其在预制混凝土中的应用提供了可行性。
