Smarzewski Piotr
Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 Gen. Sylwestra Kaliskiego, 00-908 Warsaw, Poland.
Materials (Basel). 2025 Jun 1;18(11):2585. doi: 10.3390/ma18112585.
Recycling in the construction industry is a necessity, not just a fashionable trend in scientific research. The use of coal slag aggregates in concrete means a significant reduction in environmental footprint and should be a priority. For these reasons, this study presents tests of the physical and mechanical properties of high-performance concrete (HPC) with coal slag (CS) used as a replacement for natural coarse aggregate in the amounts of 10%, 20%, and 30% after a long curing time. The investigation determined the porosity, water absorption, density, compressive strength, flexural strength, tensile splitting strength, modulus of elasticity, and ultrasonic pulse velocity (UPV), and analyzed HPC microstructure at 28, 56 days, as well as 2 years of maturation. The use of coal slag resulted in significant increases in compressive strength, flexural strength, and tensile splitting strength compared to reference concrete. However, for HPC with CS, a slight decrease in the elastic modulus and UPV was obtained. The SEM analysis showed a very good adhesion of the cement paste to the slag aggregate. In general, research shows that it is possible to obtain durable high-performance concrete with a 30% replacement of natural aggregate by coal slag.
建筑行业的回收利用是必要之举，而非科研领域的一种时尚潮流。在混凝土中使用煤渣集料意味着显著减少环境足迹，应成为优先事项。基于这些原因，本研究对高性能混凝土（HPC）进行了物理和力学性能测试，该高性能混凝土在长时间养护后，以10%、20%和30%的用量使用煤渣（CS）替代天然粗集料。研究测定了孔隙率、吸水率、密度、抗压强度、抗折强度、劈裂抗拉强度、弹性模量和超声波脉冲速度（UPV），并分析了高性能混凝土在28天、56天以及2年龄期时的微观结构。与基准混凝土相比，使用煤渣使抗压强度、抗折强度和劈裂抗拉强度显著提高。然而，对于掺加煤渣的高性能混凝土，弹性模量和超声波脉冲速度略有下降。扫描电子显微镜分析表明，水泥浆与矿渣集料之间具有良好的粘结性。总体而言，研究表明用煤渣替代30%的天然集料能够制备出耐久性良好的高性能混凝土。
