A Sustainable Graphene Based Cement Composite

Sustainability

卷:9

Shazim Ali Memon¹  Zainah Ibrahim²  Muhammad Faisal Javed²  Sardar Kashif Ur Rehman²  Rao Arsalan Khushnood³ 

[1] Department of Civil Engineering, School of Engineering, Nazarbayev University, 010000 Astana, Kazakhstan;

[2] Department of Civil Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;

[3] NUST Institute of Civil Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, 44000 Islamabad, Pakistan;

关键词: rheological properties;    self-sensing;    piezo-resistivity;    graphene nanoplatelets;    structural health monitoring;   

DOI  :  10.3390/su9071229

来源: DOAJ

【 摘 要 】

The rheological properties of fresh cement paste with different content of graphene nanoplatelets (GNPs), different shear rate cycles and resting time was investigated. The rheological data were fitted by the Bingham model, Modified Bingham model, Herschel–Bulkley model and Casson model to estimate the yield stress and plastic viscosity, and to see trend of the flow curves. The effectiveness of these rheological models was expressed by the standard error. Test results showed that yield stress and plastic viscosity increased with the increase in the content of graphene in the cement based composite and resting time while the values of these parameters decreased for higher shear rate cycle. In comparison to control sample, the GNP cement based composite showed 30% increase in load carrying capacity and 73% increase in overall failure strain. Piezo-resistive characteristics of GNP were employed to evaluate the self-sensing composite material. It was found that, at maximum compressive load, the electrical resistivity value reduced by 42% and hence GNP cement based composite can be used to detect the damages in concrete. Finally, the practical application of this composite material was evaluated by testing full length reinforced concrete beam. It was found that graphene–cement composite specimen successfully predicted the response against cracks propagation and hence can be used as self-sensing composite material.

【 授权许可】

Unknown