Szcześniak Anna, Siwiński Jarosław, Stolarski Adam, Piekarczuk Artur, Nasiłowska Barbara
Faculty of Civil Engineering and Geodesy, Military University of Technology, 00-908 Warsaw, Poland.
Instytut Techniki Budowlanej, 00-611 Warsaw, Poland.
Materials (Basel). 2024 Dec 25;18(1):28. doi: 10.3390/ma18010028.
The paper presents experimental studies on the influence of a simultaneous, appropriately proportioned combination of microsilica and fly ash additives on the physical and mechanical properties of ultra-high-performance concretes (UHPCs). Concrete mixtures with the addition of microsilica in the amount of 6.7-14.7% and fly ash in the amount of 8.3-26.7% were analyzed, assuming a constant content of cement, water and superplasticizer. Experimental studies were carried out regarding the consistency of the fresh concrete mixtures and on the compressive strength, flexural strength, tensile splitting strength, secant modulus of elasticity, depth of penetration of water under pressure into hardened concrete and water absorption. The analysis of mechanical properties was carried out during a long maturation period from 2 to 90 days. Additionally, the influence of the cost of component materials on the final cost of concrete was taken into account. The test results indicate the effectiveness of the use of microsilica and fly ash additives in ultra-high-performance concretes and possible directions for optimizing their proportions in order to achieve the intended physical and mechanical properties. The best strength properties were obtained for concrete containing 16.7% fly ash and 13.3% microsilica. The highest resistance to water penetration and absorption under pressure was characterized by concretes containing an increased content of microsilica up to 14.7%.
本文介绍了关于硅灰和粉煤灰添加剂同时、按适当比例组合对超高性能混凝土（UHPC）物理和力学性能影响的试验研究。在水泥、水和高效减水剂含量恒定的情况下，分析了硅灰添加量为6.7 - 14.7%、粉煤灰添加量为8.3 - 26.7%的混凝土混合物。针对新拌混凝土混合物的稠度以及抗压强度、抗折强度、劈裂抗拉强度、割线弹性模量、压力水渗入硬化混凝土的深度和吸水率开展了试验研究。力学性能分析在2至90天的较长养护期内进行。此外，还考虑了组成材料成本对混凝土最终成本的影响。试验结果表明了在超高性能混凝土中使用硅灰和粉煤灰添加剂的有效性，以及为实现预期物理和力学性能优化其比例的可能方向。含16.7%粉煤灰和13.3%硅灰的混凝土获得了最佳强度性能。含硅灰量增加至14.7%的混凝土表现出最高的抗压力水渗透和吸水性能。
