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Effect of Graphene Oxide on Mechanical Properties and Durability of Ultra-High-Performance Concrete Prepared from Recycled Sand
- Source :
- Nanomaterials, Vol 10, Iss 1718, p 1718 (2020), Nanomaterials, Volume 10, Issue 9
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- Ultra-high-performance concrete (UHPC) has been used as an advanced construction material in civil engineering because of its excellent mechanical properties and durability. However, with the depletion of the raw material (river sand) used for preparing UHPC, it is imperative to find a replacement material. Recycled sand is an alternative raw material for preparing UHPC, but it degrades the performance. In this study, we investigated the use of graphene oxide (GO) as an additive for enhancing the properties of UHPC prepared from recycled sand. The primary objective was to investigate the effects of GO on the mechanical properties and durability of the UHPC at different concentrations. Additionally, the impact of the GO additive on the microstructure of the UHPC prepared from recycled sand was analysed at different mixing concentrations. The addition of GO resulted in the following: (1) The porosity of the UHPC prepared from recycled sand was reduced by 4.45&ndash<br />11.35%<br />(2) the compressive strength, flexural strength, splitting tensile strength, and elastic modulus of the UHPC prepared from recycled sand were enhanced by 8.24&ndash<br />16.83%, 11.26&ndash<br />26.62%, 15.63&ndash<br />29.54%, and 5.84&ndash<br />12.25%, respectively<br />(3) the resistance of the UHPC to penetration of chloride ions increased, and the freeze&ndash<br />thaw resistance improved<br />(4) the optimum mixing concentration of GO in the UHPC was determined to be 0.05 wt.%, according to a comprehensive analysis of its effects on the microstructure, mechanical properties, and durability of the UHPC. The findings of this study provide important guidance for the utilisation of recycled sand resources.
- Subjects :
- Materials science
General Chemical Engineering
microstructure
0211 other engineering and technologies
02 engineering and technology
Raw material
mechanical properties
Article
lcsh:Chemistry
Flexural strength
021105 building & construction
Ultimate tensile strength
recycled sand
General Materials Science
Composite material
Porosity
Elastic modulus
ultra-high-performance concrete
021001 nanoscience & nanotechnology
Microstructure
Durability
Compressive strength
lcsh:QD1-999
durability
graphene oxide
0210 nano-technology
Subjects
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 10
- Issue :
- 1718
- Database :
- OpenAIRE
- Journal :
- Nanomaterials
- Accession number :
- edsair.doi.dedup.....291d3f4e5f825b97bbc1e8d60604e062