Physical Properties of Concrete Containing Graphene Oxide Nanosheets.

Yu-You Wu,Longxin Que,Paul Lambert,Zhaoyang Cui

doi:10.3390/ma12101707

Abstract

Concrete made from ordinary Portland cement is one of the most widely used construction materials due to its excellent compressive strength. However, concrete lacks ductility resulting in low tensile strength and flexural strength, and poor resistance to crack formation. Studies have demonstrated that the addition of graphene oxide (GO) nanosheet can effectively enhance the compressive and flexural properties of ordinary Portland cement paste, confirming GO nanosheet as an excellent candidate for using as nano-reinforcement in cement-based composites. To date, the majority of studies have focused on cement pastes and mortars. Only limited investigations into concretes incorporating GO nanosheets have been reported. This paper presents an experimental investigation on the slump and physical properties of concrete reinforced with GO nanosheets at additions from 0.00% to 0.08% by weight of cement and a water–cement ratio of 0.5. The study demonstrates that the addition of GO nanosheets improves the compressive strength, flexural strength, and split tensile strength of concrete, whereas the slump of concrete decreases with increasing GO nanosheet content. The results also demonstrate that 0.03% by weight of cement is the optimum value of GO nanosheet dosage for improving the split tensile strength of concrete.

Highlights

Concrete made from ordinary Portland cement is one of the most widely used construction materials [1]
Are lower thanincrease that ofofconcrete without nanosheets (GCO0). It ishas slump of concrete decreased with the the dosage of GOGO
The slump of concrete containing graphene oxide (GO) nanosheets decreases with the addition of GO nanosheets from 0.02% to 0.80% by weight of cement under a water to cement ratio of 0.5

Summary

Introduction

Concrete made from ordinary Portland cement is one of the most widely used construction materials [1]. Concrete is desirable because of its excellent compressive strength. Concrete has poor ductility, with low tensile strength and flexural strength, and poor resistance to crack formation [1]. Many attempts have been made to enhance its properties and performance by adding supplementary cementitious materials (e.g., fly ash, blast-furnace slag, etc.) and fibers (e.g., glass and steel), but they fail to adequately enhance its physical properties and durability at the nanoscale [2,3]. Ordinary Portland cement is the principal binder holding sand and coarse gravels or crushed rocks together to produce concrete when water is added to initiate the hydration. It is reported that the global production of cement has exceeded 3600 million tonnes annually with more than 55% from

Methods

Results

Conclusion