Ghazanlou Siamak Imanian, Jalaly Maisam, Sadeghzadeh Sadegh, Korayem Asghar Habibnejad
Nanotechnology Department, School of Advanced Technologies, Iran University of Science & Technology (IUST), Narmak, Tehran, 16846-13114, Iran.
School of Civil Engineering, Iran University of Science & Technology (IUST), Narmak, Tehran, 16846-13114, Iran.
Sci Rep. 2020 Feb 18;10(1):2859. doi: 10.1038/s41598-020-59846-y.
In this study, fabrication of a composite containing the ordinary Portland cement (OPC) and magnetite (FeO) micro/nanoparticles is reported. In the first stage, the cement paste samples with a fixed 0.2 wt.% FeO additive in four different particle sizes (20-40 nm, 80-100 nm, 250-300 nm, and 1-2 µm) were prepared to check the effect of magnetite size. Magnetite was found to play an effective role in reinforcing cement matrix. The results showed that the cement paste reinforced by magnetite nanoparticles of 20-40 nm size range had the highest compressive, flexural, and tensile strengths compared to those of the other samples reinforced by larger particles. In the second stage, various amounts of the FeO nanoparticles of 20-40 nm size range were added to the cement to evaluate the influence of magnetite amount and find the optimized reinforcement amount. It was revealed that adding 0.25 wt.% FeO nanoparticles of 20-40 nm size range, as the optimal specimen, increased the compressive strength, flexural strength and tensile splitting strength by 23-32, 17-25, and 15-19%, respectively, and decreased the electrical resistance by 19-31%.
本研究报道了一种包含普通硅酸盐水泥（OPC）和磁铁矿（FeO）微纳米颗粒的复合材料的制备。在第一阶段，制备了固定添加0.2 wt.% FeO且具有四种不同粒径（20 - 40 nm、80 - 100 nm、250 - 300 nm和1 - 2 µm）的水泥浆体样品，以检验磁铁矿粒径的影响。发现磁铁矿在增强水泥基体方面发挥了有效作用。结果表明，与其他用较大颗粒增强的样品相比，由粒径范围为20 - 40 nm的磁铁矿纳米颗粒增强的水泥浆体具有最高的抗压、抗折和抗拉强度。在第二阶段，向水泥中添加不同量的粒径范围为20 - 40 nm的FeO纳米颗粒，以评估磁铁矿含量的影响并找到最佳增强量。结果表明，添加0.25 wt.%粒径范围为20 - 40 nm的FeO纳米颗粒作为最佳样品，抗压强度、抗折强度和劈裂抗拉强度分别提高了23 - 32%、17 - 25%和15 - 19%，电阻降低了19 - 31%。
