Golewski Grzegorz Ludwik
Department of Structural Engineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40 Str, 20-618 Lublin, Poland.
Materials (Basel). 2023 Jul 25;16(15):5218. doi: 10.3390/ma16155218.
Studies were carried out to find a relation between the important physical property, i.e., water absorption and the main mechanical parameter, i.e., compressive strength (), of concretes containing coal fly ash (CFA) in the amounts of 0% (CFA-00), 20% (CFA-20%), and 30% (CFA-30). The methodology of the water absorption tests reflected the conditions prevailing in the case of reinforced concrete structures operating below the water table. The microstructure of all materials was also assessed. Based on the conducted studies, it was found that both the of concretes with the addition of CFA and its water absorption depended on the percentage of waste used, whereas both analyzed parameters were closely related to the structure of the cement matrix and interfacial transition zone area between the coarse aggregates and the paste. It should be stated that at the content of 20% CFA in the binder composition, an increase in the of the material is observed, with a simultaneous increase in its water absorption. On the other hand, the addition of 30% CFA results in a significant decrease in both the strength of the composite and its water absorption. Thus, it was found that in the case of concretes with the addition of CFA, the strength of the material is directly proportional to the level of its water absorption. Moreover, the concrete including 30% CFA may increase the durability of reinforced concrete structures subjected to immersion conditions. From an application point of view, the obtained research results may be helpful in understanding the impact of the CFA additive on the level of water absorption in cement concretes with this waste.
开展了多项研究，以探寻重要物理性能（即吸水性）与主要力学参数（即抗压强度()）之间的关系，这些研究针对的是粉煤灰（CFA）含量分别为0%（CFA - 00）、20%（CFA - 20%）和30%（CFA - 30%）的混凝土。吸水性测试方法反映了地下水位以下运行的钢筋混凝土结构的实际情况。还评估了所有材料的微观结构。基于所进行的研究发现，添加CFA的混凝土的抗压强度及其吸水性均取决于所用废料的百分比，而这两个分析参数均与水泥基体结构以及粗骨料与浆体之间的界面过渡区面积密切相关。应当指出的是，当粘结剂组合物中CFA含量为20%时，材料的抗压强度会增加，同时其吸水性也会增加。另一方面，添加30%的CFA会导致复合材料的强度及其吸水性均显著降低。因此，发现对于添加CFA的混凝土，材料的强度与其吸水性成正比。此外，含30% CFA的混凝土可能会提高处于浸泡条件下的钢筋混凝土结构的耐久性。从应用角度来看，所获得的研究结果可能有助于理解CFA添加剂对含此类废料的水泥混凝土吸水性水平的影响。
