DataSheet1_Synergetic–Complementary Use of Industrial Solid Wastes to Prepare High-Performance Rapid Repair Mortar.docx

With the vigorous development of infrastructure engineering, there are growing demands for high-performance rapid repair mortar, especially those using environmental-friendly and low-carbon cementitious materials. Hereupon, this work explored an innovative approach for rapid repair mortar preparation using solid waste-based calcium sulfoaluminate cement. The calcium sulfoaluminate cement was first prepared via synergetic–complementary use of industrial solid wastes and then adopted to prepare rapid repair mortar by proportionally mixing with standard sand and four additives (i.e., polycarboxylate superplasticizer, lithium carbonate, boric acid, and latex powder). The mechanistic analysis indicated that the four additives comprehensively optimized the mechanical strengths, fluidity, and setting time of rapid repair mortar by adjusting the hydration process of calcium sulfoaluminate cement. The test results showed that the 2-h compressive and flexural strength, and 1-day bonding strength of the prepared rapid repair mortar were 32.5, 9.2, and 2.01 MPa, respectively, indicating excellent early-age mechanical performance. In addition, the 28-day compressive and flexural strengths of the rapid repair mortar reached 71.8 and 17.7 MPa. Finally, a life cycle assessment and economic analysis indicated that this approach achieved environmental-friendly utilization of industrial solid wastes, and cost-effective and energy-saving natures, which supports current trends towards a circular economy and green sustainable development.

随着基础设施工程的蓬勃发展，市场对高性能快速修补砂浆的需求日益增长，尤其是采用环保低碳胶凝材料的砂浆产品。在此背景下，本研究探索了一种基于固废基硫铝酸盐水泥（calcium sulfoaluminate cement）的快速修补砂浆制备创新方法。首先通过协同互补利用工业固废制备硫铝酸盐水泥，随后将其与标准砂及四种外加剂（即聚羧酸系减水剂、碳酸锂、硼酸及乳胶粉）按比例混合，制备得到快速修补砂浆。机理分析表明，四种外加剂通过调控硫铝酸盐水泥的水化进程，全面优化了快速修补砂浆的力学强度、流动度与凝结时间。试验结果显示，所制备的快速修补砂浆的2h抗压强度、抗折强度及1d粘结强度分别可达32.5MPa、9.2MPa与2.01MPa，展现出优异的早期力学性能。此外，该快速修补砂浆的28d抗压强度与抗折强度分别达到71.8MPa与17.7MPa。最后，生命周期评价与经济性分析表明，该方法实现了工业固废的环保化利用，兼具成本效益与节能特性，契合当前循环经济与绿色可持续发展的发展趋势。