A Study of Mechanical and Microstructures Properties of Autoclaved Aerated Concrete Containing Nano-Graphene

Document Type : Research Article

Authors

1 MSC, student, Faculty of Civil Engineering, Payame Noor University, North Tehran Branch, Tehran, Iran.

2 Postdoctoral Research Assistant, Civil Faculty, Sharif University of Technology

3 Assistant Professor, Faculty of Civil Engineering, Payame Noor University, North Tehran Branch, Tehran, Iran.

4 Manager of Quds Razavi Qarchak Lightweight Building Factory, Tehran, Iran

5 Managing Director of Ghods Razavi Lightweight Construction Factories Company, Tehran, Iran.

Abstract

In recent years, autoclaved aerated concrete (AAC) has been widely used in the building construction industry, especially for the construction of infill walls. However, the AAC suffers from several drawbacks such as low compressive and tensile strength, high water absorption as well as insufficient resistance against impacts. To address such issues, this study evaluates the mechanical properties of the AAC blocks in which, the cement has been replaced with nano-graphene. For this purpose, various replacement ratios (0.2, 0.4, and 0.8) were selected and different tests such as compressive and tensile strength (cylindrical specimens with the size of 10×20cm), impact resistance and water absorption (cubic specimens), scanning electron microscope (SEM) and X-ray diffraction (XRD) were carried out. Promisingly, the results indicate that incorporation of the nano-graphene improves the compressive and tensile strength as well as the impact resistance by 45, 81, and 130% compared to the control specimen. Moreover, the water absorption of the specimens was reduced up to 61%. Based on the SEM results, the inclusion of the NG in the AAC, makes the grains stick together firmly and also, downsizes the grains by 30%.   

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 6
September 2022
Pages 2129-2150

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