Anastasiou Eleftherios K
Department of Civil Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
Materials (Basel). 2021 Jan 8;14(2):301. doi: 10.3390/ma14020301.
Environmental considerations and technical benefits have directed research towards reducing cement clinker content in concrete, and one of the best ways to do this is to replace cement with supplementary cementitious materials. High calcium fly ash, ladle furnace slag, and limestone filler were investigated as supplementary cementitious materials in cement pastes, and binary mixtures were produced at 10%, 20%, and 30% cement replacement rates for each material. The water requirement for maximum packing and for normal consistency were obtained for each paste, and strength development was determined at 3, 7, 28, and 90 days for the 20% replacement rate. Furthermore, two ternary mixtures at 30% cement replacement were also prepared for maximum packing density and tested for compressive strength development. The results showed that high calcium fly ash decreased cement paste packing and increased water demand but contributed to strength development through reactivity. Ladle furnace slag and limestone filler, on the other hand, were less reactive and seemed to contribute to strength development through the filler effect. The ternary paste with 70% cement, 20% high calcium fly ash, and 10% limestone filler showed equivalent strength development to that of the reference cement paste.
环境因素和技术优势促使研究朝着降低混凝土中水泥熟料含量的方向发展，而实现这一目标的最佳方法之一是用辅助胶凝材料替代水泥。研究了高钙粉煤灰、钢包精炼炉渣和石灰石粉作为水泥浆体中的辅助胶凝材料，并针对每种材料以10%、20%和30%的水泥替代率制备了二元混合物。测定了每种浆体达到最大堆积密度和标准稠度时的需水量，并在20%替代率下测定了3天、7天、28天和90天的强度发展情况。此外，还制备了两种水泥替代率为30%的三元混合物以达到最大堆积密度，并测试了其抗压强度发展情况。结果表明，高钙粉煤灰降低了水泥浆体的堆积密度并增加了需水量，但通过反应活性促进了强度发展。另一方面，钢包精炼炉渣和石灰石粉的反应活性较低，似乎是通过填充效应促进了强度发展。由70%水泥、20%高钙粉煤灰和10%石灰石粉组成的三元浆体的强度发展与参考水泥浆体相当。
