氧化石墨烯对水泥基复合材料微观结构的调控作用及对抗压抗折强度的影响

发布时间：2019-05-08 13:00

【摘要】：通过氧化法制备得到氧化石墨烯(GO),通过GO与丙烯酸(AA)和丙烯酰胺(AM)进行插层聚合反应制备得到插层复合物GO/P(AA-AM)。检测结果表明,GO在插层复合物中具有较小的尺寸和均匀的分布,将GO/P(AA-AM)掺入水泥基复合材料中,发现水泥水化产物成为规整的针状、棒状或多面体状晶体,并且能够聚集形成具规整形貌的微观结构和宏观结构,水泥基复合材料中的裂缝及有害孔洞比对照样品明显减少,其抗压强度和抗折强度比对照样品有明显提高。提出了GO纳米片层对于水泥基复合材料规整结构的调控机理,认为GO纳米片层及活性基团能够促进水泥化产物形成规整形状的水化晶体,最初形成的水化晶体成为后续水化晶体形成的模板,通过晶体的生长最终形成规整水化晶体及规整的微观结构和宏观结构。
[Abstract]:Graphene oxide (GO), was synthesized by oxidation. The intercalation complex GO/P (AA-AM) was prepared by intercalation polymerization of GO with acrylic acid (AA) and acrylamide (AM). The results show that GO has small size and uniform distribution in the intercalated composites. When GO/P (AA-AM) is added into cement-based composites, the hydration products of cement become regular needle-like, rod-shaped or polyhedral crystals. The cracks and harmful voids in the cement-based composites are obviously less than those of the control, and the compressive strength and flexural strength of the cement-based composites are significantly higher than those of the control. The regulation mechanism of GO nano-laminate on the regular structure of cement-based composites was put forward. It was considered that GO nano-laminate and active groups could promote the formation of regular hydration crystals of cement-based composites. The initial hydration crystal becomes a template for the formation of the subsequent hydration crystal, and the regular hydration crystal and the regular microstructure and macro-structure are finally formed by the growth of the crystal.
【作者单位】：陕西科技大学轻工科学与工程学院;陕西科技大学环境科学与工程学院;陕西科技大学化学与化工学院;
【基金】：国家自然科学基金面上项目(21276152) 陕西省科技统筹资源引导项目(2016KTCL01-14)~~
【分类号】：TU599

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