石墨烯/环氧涂层钢筋与混凝土的黏结性能

选取4种直径(14、18、22、25 mm)、4种涂层(3种石墨烯/环氧涂层、1种无涂层)的钢筋制作钢筋混凝土中心拉拔试件,研究涂层中石墨烯掺量对钢筋混凝土黏结性能的影响.结果表明:涂层钢筋与混凝土间的黏结性能比普通无涂层钢筋试件差;涂层钢筋混凝土与无涂层钢筋混凝土的极限黏结强度之比随着钢筋直径的增加而减小;石墨烯掺量对涂层钢筋与混凝土的黏结性能影响很小;钢筋直径为14 mm的2组试件发生拔出破坏,其余各组试件均发生劈裂破坏.在实际工程中,石墨烯/环氧涂层钢筋可依据普通环氧涂层钢筋的规范加以应用.

Bond Properties of Graphene/Epoxy Coated Steel Bars and Concrete

The reinforced concrete center pull out specimens were prepared by 4different diameters(14, 18, 22, 25mm) and 4different coating(3graphene/epoxy coatins and the control). The effect of content of graphene in graphene/epoxy coating on the bonding performance of reinforced concrete was observed. The results show that the bonding performance between graphene/epoxy coated steel bars and concrete is worse than that of control. The ratio of the ultimate bond strength between coated reinforced concrete and the control decreases as the diameter of the steel bars increases. The content of graphene has little effect on the bonding performance of graphene/epoxy coated steel bars and concrete. Pull out failure occurred in two groups of specimens with a steel bar diameter of 14mm, and splitting failure occurred in the other groups of specimen. In practical engineering, graphene/epoxy coated steel bars can be applied according to the specifications of ordinary epoxy coated steel bars.