A Study on Durability Performance of Concretes Incorporating Graphene Oxide Nanoplatelets and Ground Granulated Blast Furnace Slag

In this work, the addition of a combination of Graphene Oxide Nanoplatelets (GONPs) and Ground Granulated Blast Furnace Slag (GGBFS) was studied as admixture in concrete. Tests on physical and mechanical properties and chloride permeability were conducted. GGBFS was replaced with Ordinary Portland Cement (OPC) and it was determined that GGBFS Up to ۵۰% by weight improves the physical and mechanical properties of concrete. GONPs with an optimal amount of ۵۰% by weight of GGBFS were added to the concrete and the physical and mechanical properties of the samples were determined. It was observed that the addition of GONPs was effective in improving the mechanical strength and physical properties of specimens. The results indicated that addition of ۰.۱ wt. % GO and ۵۰ wt. % GGBFS would increase the compressive strength of the concrete sample up to ۴۲.۷ % during ۲۸ days and ۴۶ % during ۹۰ days compared to OPC. Concrete with a combination of ۰.۱ wt. % GONPs and ۵۰ wt. % GGBFS witnessed an increase in its flexural strength up to ۵۸.۵ % during ۲۸ days and ۵۹.۲ % during ۹۰ days.  The results indicated that by adding ۰.۱ wt. % GO and ۵۰ wt. %, concrete chloride permeability decreased substantially ۷۲ % for ۹۰-day cured samples compared to OPC. GONPs as an alternative to cement up to ۰.۱% by weight can accelerate the formation of C-S-H gel, thereby increasing the strength and improving the resistance of water absorption and chloride permeability. The effects of pozolanic reaction in the concrete leading to the filling of the pores were significant factors in the proposed curtailment mechanism.

Keywords:

Concrete , Durability , Graphene Oxide , Ground Granulated Blast Furnace Slag