Yang Xiuying, Xing Yiwu, Wang Zhen, Duan Shixin, Zhao Guodong, Song Jie, Xiao Zhaohui
School of Architecture and Engineering, Liaocheng University, Liaocheng 252000, China.
School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China.
Materials (Basel). 2025 Jun 26;18(13):3028. doi: 10.3390/ma18133028.
Ultra-high-performance concrete (UHPC) has gained widespread application across various domains owing to its superior properties. Nevertheless, the high cement content and associated costs present challenges, including significant shrinkage of the cement matrix and economic considerations. Using industrial by-products or waste to replace some raw materials is one of the effective solutions. Meanwhile, China's ceramic industry generates a large amount of waste every year. Applying ceramics in UHPC can effectively solve these problems. This study explores the use of recycled tile waste as a sustainable alternative to reduce the use of natural aggregates and cement and enhance the performance of UHPC. To investigate the impact of recycled ceramics on the mechanical properties of UHPC, three preparation methods were employed: (1) single incorporation of ceramic tile aggregate (CTA) to replace fine aggregates (0-100%), (2) single incorporation of ceramic tile powder (CTP) to replace cementitious materials (0-20%), and (3) dual incorporation of both CTA and CTP. The effects of different preparation methods and substitution rates on mechanical properties were evaluated through compressive and flexural strength tests, and microstructure analyses were conducted by scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). The test results show that the compressive strength and flexural strength of UHPC increased with an increase in the ceramic particle substitution rate and reached the maximum value at a 100% substitution rate. On the contrary, ceramic powder substitution initially reduced the compressive strength, and it slightly recovered at a substitution rate of 10%. However, the bending strength decreased with an increase in the substitution rate of the ceramic powder. When ceramic particles and ceramic powder were used in combination, the compressive strength was the highest when 100% ceramic particles and 20% ceramic powder were used as substitutes. The maximum flexural strength occurred when 100% ceramic particles or 5% ceramic powder was used as a substitute. This study demonstrates that recycled ceramic waste can effectively enhance the mechanical properties of UHPC, providing a sustainable solution for reducing cement consumption and improving the performance of concrete.
超高性能混凝土（UHPC）因其卓越性能在各个领域得到广泛应用。然而，高水泥含量及相关成本带来了挑战，包括水泥基体的显著收缩和经济考量。使用工业副产品或废弃物替代部分原材料是有效的解决方法之一。同时，中国陶瓷行业每年产生大量废弃物。将陶瓷应用于UHPC可有效解决这些问题。本研究探索使用回收瓷砖废料作为可持续替代物，以减少天然骨料和水泥的使用，并提高UHPC的性能。为研究回收陶瓷对UHPC力学性能的影响，采用了三种制备方法：（1）单一掺入瓷砖骨料（CTA）替代细骨料（0 - 100%），（2）单一掺入瓷砖粉末（CTP）替代胶凝材料（0 - 20%），以及（3）同时掺入CTA和CTP。通过抗压和抗折强度试验评估不同制备方法和替代率对力学性能的影响，并通过扫描电子显微镜（SEM）和压汞孔隙率法（MIP）进行微观结构分析。试验结果表明，UHPC的抗压强度和抗折强度随陶瓷颗粒替代率的增加而提高，并在100%替代率时达到最大值。相反，陶瓷粉末替代最初降低了抗压强度，在10%替代率时略有恢复。然而，抗折强度随陶瓷粉末替代率的增加而降低。当同时使用陶瓷颗粒和陶瓷粉末时，以100%陶瓷颗粒和20%陶瓷粉末作为替代物时抗压强度最高。当以100%陶瓷颗粒或5%陶瓷粉末作为替代物时抗折强度最大。本研究表明，回收陶瓷废料可有效提高UHPC的力学性能，为减少水泥消耗和改善混凝土性能提供了可持续解决方案。
