نوع مقاله : مقاله پژوهشی
1 دانشگاه بین المللی امام خمینی
2 دانشگاه بینالمللی امام خمینی (ره)، قزوین، ایران
عنوان مقاله [English]
Durability is an important property that determines the long-term behavior of cement-based materials. In this study, graphene oxide nanoparticles (GO) are proposed to prevent the ingress of the water in the concrete. GO are the product of chemical exfoliation of graphite and contain a range of reactive oxygen functional groups that enable it as a suitable candidate for reaction in cementitious materials through physical functionalization. The experimental program is performed to study the unsaturated transport properties under different hydrostatic pressures and mechanical behavior of GO-reinforced concrete. The “Cylindrical chamber” method were employed for penetration tests. The results of absorption and penetration tests indicate that the incorporation of a very low fraction of GO can effectively hinder the ingress of water molecules in both direction (casting and perpendicular to it). It can be concluded that adding GO improve the transport properties of concrete which subsequently improves its durability. The compressive strength of concrete incorporating 0.1% by weight of cement GO increased by 25% and 50% than those of concrete without GO after curing for 28 days and 90 days respectively. The strengths enhancement can be attributed to the promotion of hydration and the finer pore structure of cement paste incorporating GO .The results of compressive strength anisotropy showed that the addition of GO decrease anisotropy. This can be attributed to the random orientation of the GO sheets in the concrete matrix.