Klapiszewska Izabela, Kubiak Adam, Parus Anna, Janczarek Marcin, Ślosarczyk Agnieszka
Institute of Building Engineering, Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3, PL-60965 Poznan, Poland.
Institute of Chemistry and Technical Electrochemistry, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland.
Materials (Basel). 2022 Jan 29;15(3):1069. doi: 10.3390/ma15031069.
This study presents the results of research on cement mortars amended with two zinc oxides obtained by two different methods: hydrothermal ZnO-H and microwave ZnO-M. Our work indicates that, in contrast to spherical ZnO-H, ZnO-M was characterized by a columnar particle habit with a BET surface area of 8 m/g, which was four times higher than that obtained for hydrothermally obtained zinc oxide. In addition, ZnO-M induced much better antimicrobial resistance, which was also reported in cement mortar with this oxide. Both zinc oxides showed very good photocatalytic properties, as demonstrated by the 4-chlorophenol degradation test. The reaction efficiency was high, reaching the level of 90%. However, zinc oxides significantly delayed the cement binder setting: ZnO-H by 430 min and ZnO-M by 380 min. This in turn affected the increments in compressive strength of the produced mortars. No significant change in compressive strength was observed on the first day of setting, while significant changes in the strengths of mortars with both zinc oxides were observed later after 7 and 28 days of hardening. As of these times, the compressive strengths were about 13-15.5% and 12-13% higher than the corresponding values for the reference mortar, respectively, for ZnO-H and ZnO-M. There were no significant changes in plasticity and flexural strength of mortars amended with both zinc oxides.
水热法制备的ZnO-H和微波法制备的ZnO-M。我们的研究表明，与球形的ZnO-H不同，ZnO-M具有柱状颗粒形态，其BET表面积为8 m²/g，是水热法制备的氧化锌的四倍。此外，ZnO-M具有更好的抗菌性能，在含有这种氧化物的水泥砂浆中也有相关报道。两种氧化锌都表现出非常好的光催化性能，4-氯苯酚降解试验证明了这一点。反应效率很高，达到了90%的水平。然而，氧化锌显著延迟了水泥粘结剂的凝结：ZnO-H延迟了430分钟，ZnO-M延迟了380分钟。这反过来又影响了所制备砂浆抗压强度的增加。在凝结的第一天，抗压强度没有明显变化，而在硬化7天和28天后，两种含氧化锌砂浆的强度都出现了显著变化。截至这些时间点，ZnO-H和ZnO-M的抗压强度分别比参考砂浆的相应值高出约13 - 15.5%和12 - 13%。用两种氧化锌改性的砂浆的可塑性和抗弯强度没有显著变化。
