Záleská Martina, Pavlíková Milena, Pivák Adam, Marušiak Šimon, Jankovský Ondřej, Lauermannová Anna-Marie, Lojka Michal, Antončík Filip, Pavlík Zbyšek
Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic.
Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech Republic.
Materials (Basel). 2021 Mar 16;14(6):1450. doi: 10.3390/ma14061450.
The ongoing tendency to create environmentally friendly building materials is nowadays connected with the use of reactive magnesia-based composites. The aim of the presented research was to develop an ecologically sustainable composite material based on MOC (magnesium oxychloride cement) with excellent mechanical, chemical, and physical properties. The effect of the preparation procedure of MOC pastes doped with graphene nanoplatelets on their fresh and hardened properties was researched. One-step and two-step homogenization techniques were proposed as prospective tools for the production of MOC-based composites of advanced parameters. The conducted experiments and analyses covered X-ray fluorescence, scanning electron microscopy, energy-dispersive spectroscopy, high-resolution transmission electron microscopy, sorption analysis, X-ray diffraction, and optical microscopy. The viscosity of the fresh mixtures was monitored using a rotational viscometer. For the hardened composites, macro- and micro-structural parameters were measured together with the mechanical parameters. These tests were performed after 7 days and 14 days. The use of a carbon-based nanoadditive led to a significant drop in porosity, thus densifying the MOC matrix. Accordingly, the mechanical resistance was greatly improved by graphene nanoplatelets. The two-step homogenization procedure positively affected all researched functional parameters of the developed composites (e.g., the compressive strength increase of approximately 54% after 7 days, and 37% after 14 days, respectively) and can be recommended for the preparation of advanced functional materials reinforced with graphene.
当前，制造环保建筑材料的趋势与使用基于活性氧化镁的复合材料相关。本研究的目的是开发一种基于MOC（氯氧化镁水泥）的生态可持续复合材料，使其具有优异的机械、化学和物理性能。研究了掺杂石墨烯纳米片的MOC浆料制备工艺对其新拌性能和硬化性能的影响。提出了一步和两步均质化技术，作为生产具有先进参数的基于MOC的复合材料的前瞻性工具。所进行的实验和分析包括X射线荧光、扫描电子显微镜、能量色散光谱、高分辨率透射电子显微镜、吸附分析、X射线衍射和光学显微镜。使用旋转粘度计监测新拌混合物的粘度。对于硬化后的复合材料，测量了宏观和微观结构参数以及机械参数。这些测试在7天和14天后进行。使用碳基纳米添加剂导致孔隙率显著下降，从而使MOC基体致密化。因此，石墨烯纳米片极大地提高了机械强度。两步均质化工艺对所开发复合材料的所有研究功能参数都有积极影响（例如，7天后抗压强度分别提高约54%，14天后提高37%），可推荐用于制备用石墨烯增强的先进功能材料。
