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A study of mechanical and microstructures properties of autoclaved aerated concrete containing nano-graphene

Seddighi, F ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jobe.2021.103106
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. In recent years, the autoclaved aerated concrete (AAC) has been widely used in the building construction industry, especially for 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 × 20 cm), 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, inclusion of the NG in the AAC, makes the grains stick together firmly and also, downsizes the grains by 30%. © 2021 Elsevier Ltd
  6. Keywords:
  7. Compressive strength ; Construction industry ; Graphene ; Impact resistance ; Scanning electron microscopy ; Water absorption ; X ray diffraction ; Autoclaved aerated concrete ; Building construction industry ; Compressive and tensile strengths ; Mechanical ; Microstructures properties ; Nano-graphene ; Scanning electron microscope ; Scanning electrons ; X-ray diffraction ; Tensile strength
  8. Source: Journal of Building Engineering ; Volume 43 , 2021 ; 23527102 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2352710221009645