Lv Shenghua, Zhang Jia, Zhu Linlin, Jia Chunmao
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
College of Environment Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Materials (Basel). 2016 Nov 14;9(11):924. doi: 10.3390/ma9110924.
The main problem with cement composites is that they have structural defects, including cracks, holes, and a disordered morphology, which significantly affects their strength and durability. Therefore, the construction of cement composites with defect-free structures and high strength and long durability is an important research topic. Here, by controlling the size and chemical groups of graphene oxide nanosheets (GONs) used for doping, we were able to control the entire cement matrix to form an ordered microstructure consisting of polyhedron-like crystals and exhibit flower-like patterns. The cracks and holes in the cement matrix just about vanished. The compressive and flexural strengths as well as the parameters for the durability assessment of the corresponding cement composites obviously improved compared with the control samples. Thus, the formation mechanism of the cement matrix with the ordered microstructure is proposed, and a proper explanation is given to regulation action.
水泥复合材料的主要问题在于它们存在结构缺陷，包括裂缝、孔洞以及无序的形态，这显著影响了它们的强度和耐久性。因此，构建具有无缺陷结构、高强度和长耐久性的水泥复合材料是一个重要的研究课题。在此，通过控制用于掺杂的氧化石墨烯纳米片（GONs）的尺寸和化学基团，我们能够控制整个水泥基体形成由多面体状晶体组成的有序微观结构，并呈现出花状图案。水泥基体中的裂缝和孔洞几乎消失。与对照样品相比，相应水泥复合材料的抗压强度、抗折强度以及耐久性评估参数明显提高。因此，提出了具有有序微观结构的水泥基体的形成机制，并对调控作用给出了合理的解释。
