Flexural behaviour of Graphene-reinforced concrete beams

Maruping, Pako Omogolo (2019) Flexural behaviour of Graphene-reinforced concrete beams. [USQ Project]

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Abstract

Concrete is the most used material in the construction industry. The bonding agent for concrete is cement which is responsible for about 8% of the world’s carbon emissions. The industry together education institutions have been working to reduce the amount of concrete that the industry uses. One way to reduce the use of concrete is to manipulate the mechanical properties of concrete by adding different materials to increase strength and durability. This paper utilises graphene as a material added to concrete to determine whether graphene has any effect on the slump, modulus of elasticity, flexural, compressive and tensile strength of concrete.

Graphene quantities used in this project are 0.03%, 0.05% and 0.1% by weight of cement. This project has demonstrated that the addition of graphene in concrete reduces the fluidity of fresh concrete. Graphene quantities of 0.03%, 0.05% and 0.1% by weight of cement showed a reduction in slump of 11.7%, 33.3% and 29.2% respectively when compared to the control sample. For flexural strength beams with 40mm x 150mm x 500mm layer of graphene concrete mix at the bottom of a layer of normal concrete of 110mm x 150 x 500mm to make up a beam of 150mm x 150mm x 500mm, as well as beams with full graphene concrete mix were tested and the results showed that addition of graphene also improved flexural strength, with 0.03%, 0.05% and 0.1% by weight of cement showing a 29.8%, 44.7% and 44% respectively for the 40mm beams and 0.03%, 0.05% and 0.1% by weight of cement showing a 12.3%, 7.1% and 4.7% respectively for the full graphene beams, which was a surprising result as we expected the full graphene beams to show better improvement when compared with the beams with only 40mm layer of graphene concrete mix. While compressive strength results show some improvement with some mixed results as 0.03%, 0.05% and 0.1% by weight of cement showing a 31.8%, 1% and 3.5% respectively, the results for 0.05% and 0.1% were lower than expected.

Modulus of elasticity showed a with the graphene quantities of 0.03%, 0.05% and 0.1% by weight of cement showed a reduction of 6%, 11.7% and 15.2% respectively, which means the concrete is more ductile and able to deflect more before failure. While the results for the indirect tensile tests were inconclusive as they showed a reduction in the tensile strength as graphene is added to concrete except for 0.03% of graphene samples. The results showed that graphene quantities of 0.03%, 0.05% and 0.1% by weight of cement showed a 6%, -16.9% and -4.1% respectively, this test will need to be investigated more with more samples per percentage.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours)(Civil)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Supervisors: Lokuge, Weena; Karunasena, Karu
Date Deposited: 26 Aug 2021 01:43
Last Modified: 26 Aug 2021 01:43
URI: http://eprints.usq.edu.au/id/eprint/43182

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