Szcześniak Anna, Zychowicz Jacek, Stolarski Adam
Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 gen. Sylwestra Kaliskiego Street, 00-908 Warsaw, Poland.
Materials (Basel). 2020 Jul 23;13(15):3265. doi: 10.3390/ma13153265.
This paper presents research on the impact of fly ash addition on selected physical and mechanical parameters of concrete made with slag cement. Experimental tests were carried out to measure the migration of chloride ions in concrete, the tightness of concrete exposed to water under pressure, and the compressive strength and tensile strength of concrete during splitting. Six series of concrete mixes made with CEM IIIA 42.5 and 32.5 cement were tested. The base concrete mix was modified by adding fly ash as a partial cement substitute in the amounts of 25% and 33%. A comparative analysis of the obtained results indicates a significant improvement in tightness, especially in concrete based on CEM IIIA 32.5 cement and resistance to chloride ion penetration for the concretes containing fly ash additive. In the concretes containing fly ash additive, a slower rate of initial strength increase and high strength over a long period of maturation are shown. In accordance with the presented research results, it is suggested that changes to the European standardization system be considered, to allow the use of fly ash additive in concrete made with CEM IIIA 42.5 or 32.5 cement classes. Such a solution is not currently acceptable in standards in some European Countries.
本文介绍了关于添加粉煤灰对矿渣水泥混凝土所选物理和力学参数影响的研究。进行了实验测试，以测量混凝土中氯离子的迁移、受压水作用下混凝土的密实性以及混凝土劈裂时的抗压强度和抗拉强度。对用CEM IIIA 42.5和32.5水泥制成的六组混凝土配合比进行了测试。通过添加粉煤灰作为部分水泥替代品，用量分别为25%和33%，对基础混凝土配合比进行了改性。对所得结果的对比分析表明，密实性有显著改善，特别是基于CEM IIIA 32.5水泥的混凝土，并且含粉煤灰添加剂的混凝土对氯离子渗透的抗性增强。在含粉煤灰添加剂的混凝土中，初期强度增长速度较慢，但在长期成熟过程中强度较高。根据所呈现的研究结果，建议考虑对欧洲标准化体系进行修改，以允许在由CEM IIIA 42.5或32.5水泥制成的混凝土中使用粉煤灰添加剂。目前，这种解决方案在一些欧洲国家的标准中是不可接受的。
