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Zhang, Peng
- Mechanical Properties of Fly Ash Concrete Composite Reinforced with Nano-SiO2 and Steel Fibre
Abstract Views :222 |
PDF Views:91
Authors
Affiliations
1 School of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, CN
1 School of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, CN
Source
Current Science, Vol 106, No 11 (2014), Pagination: 1529-1537Abstract
A parametric experimental study has been conducted to study the effect of nano-SiO2 particles and steel fibres on the mechanical properties of the concrete composite containing fly ash. Five different nano-SiO2 contents (1%, 3%, 5%, 7% and 9%) and five different steel fibre contents (0.5%, 1%, 1.5%, 2% and 2.5%) were used. The results indicate that addition of nano- SiO2 and steel fibres decreases the slump and slump flow of the fresh concrete composite containing fly ash, and both the slump and slump flow decrease gradually with the increase in nano-SiO2 and steel fibre content. The addition of nano-SiO2 improves the mechanical properties of concrete composites containing fly ash. There is an increase in the compressive strength and compressive modulus of elasticity with increase of nano-SiO2 content when it is below 5%, while they begin to decrease after the nano-SiO2 content is beyond 5%. Steel fibres help improve the mechanical properties of concrete composite containing fly ash and nano-particles. With the appropriate fibre content, the reinforcement of steel fibres on the compressive strength and compressive modulus of elasticity of the concrete composite becomes more obvious as the fibre content increases.Keywords
Fly Ash, Concrete Composite, Mechanical Property, Nano-SiO2, Steel Fibre.- Fracture Properties of Steel Fibre Reinforced High-Performance Concrete Containing Nano-SiO2 and Fly Ash
Abstract Views :280 |
PDF Views:90
Authors
Affiliations
1 School of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, CN
1 School of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, CN
Source
Current Science, Vol 106, No 7 (2014), Pagination: 980-987Abstract
In this article, we study the effect of steel fibre on the fracture properties of high performance concrete (HPC) containing fly ash and nano-SiO2. The results reveal that the addition of appropriate content of steel fibre helps improve the fracture properties of HPC. Steel fibre improves the fracture parameters of initial fracture toughness, unstable fracture toughness, fracture energy and critical crack opening displacement of the beam specimen of HPC. The results also show that steel fibre has major effect on the fracture curves of the three-point bending beam specimen. The fracture toughness and fracture energy increase gradually, and the area under the fracture relational curve becomes larger when the steel fibre content increases from 0.5% to 2%. However, these fracture parameters begin to decrease and the area under the fracture relational curve becomes smaller when the steel fibre content exceeds 2%. This indicates that steel fibre helps improve the fracture properties of HPC containing nano-SiO2 and fly ash only when its fibre content does not exceed 2%.Keywords
Fly Ash, Fracture Properties, High Performance Concrete, Nano-SiO2, Steel Fibre.- Effect of Nano-SiO2 Particles on Fracture Properties of Concrete Composite Containing Fly Ash
Abstract Views :231 |
PDF Views:129
Authors
Affiliations
1 Open Laboratory of Water Conservancy and Science of Key Disciplines in Henan Province, Zhengzhou University, Zhengzhou 450001, CN
2 School of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, CN
1 Open Laboratory of Water Conservancy and Science of Key Disciplines in Henan Province, Zhengzhou University, Zhengzhou 450001, CN
2 School of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, CN
Source
Current Science, Vol 108, No 11 (2015), Pagination: 2035-2043Abstract
A parametric experimental study has been conducted to investigate the effect of nano-SiO2 particles on fracture properties of concrete composite containing fly ash. Five different nano-SiO2 contents were used for this study. By means of three-point bending method, the fracture parameters of the effective crack length, initial fracture toughness, unstable fracture toughness, fracture energy, critical crack opening displacement, maximum crack opening displacement and maximum mid-span deflection of the beam specimen were measured. The results reveal that the addition of lower SiO2 content (<5%) nano-particles may help improve the fracture properties of concrete composite containing fly ash. Nano-SiO2 has a significant effect on the fracture relational curves of the three-point bending beam specimen. The fracture parameters increase gradually and the fracture relational curves become thicker as the nano-SiO2 content increases from 0% to 5%. However, the fracture parameters begin to decrease and the curves become thinner when the nano-SiO2 content exceeds 5%. These variation rules of fracture parameters and fracture relational curves indicate that nano-SiO2 contributes significantly to the improvement of fracture properties of concrete composite containing fly ash only when its content does not exceed 5%.Keywords
Three-Point Bending Method, Fracture Properties, Fly Ash Concrete, Nano-SiO2.- Recent Progress on the Water–Energy–Food Nexus using Bibliometric Analysis
Abstract Views :242 |
PDF Views:80
Authors
Affiliations
1 College of Agricultural Engineering, Hohai University, Nanjing 210098, CN
2 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, CN
1 College of Agricultural Engineering, Hohai University, Nanjing 210098, CN
2 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, CN
Source
Current Science, Vol 117, No 4 (2019), Pagination: 577-586Abstract
A systematic overview of the water–energy–food nexus studies is presented using bibliometric analysis. We have used the Web of Science Core Collection data from 2010 to 2017 for the same. The main subject categories include environmental science and water resources. Water and Environmental Science & Policy are two typical journals. USA, England and Germany are productive countries, while the main institutions are Oxford University, International Water Management Institute, and International Food Policy Research Institute. The frequently cited papers and keywords revealed the research hotspots and trends, with the major concerns of the concept and mechanism, research dimensions and nexus methodologies.Keywords
Bibliometric Analysis, Recent Progress, Systematic Overview, Water–Energy–Food Nexus.References
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