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A platform for research: civil engineering, architecture and urbanism
Mechanical Properties and Microstructure of Basalt Fiber Reinforced Concrete Under the Single-Side Salt-Freezing–Drying–Wetting Cycles
In the past, the salt freezing test does not often accord with the actual service environment of engineering, thus, we designed a test method of single-side salt-freezing–drying–wetting cycles. The mechanical properties and microstructure of ordinary concrete and basalt fiber reinforced concrete were studied. The mechanical property test is aimed at the splitting tensile strength and compressive strength of concrete after different cycles. The microstructure test is to study the hydration products by scanning electron microscope (SEM) and the pore structure of concrete by mercury intrusion porosimetry (MIP) test. The results indicate that the addition of basalt fiber can improve the compactness and pore structure of concrete. It is beneficial to enhance the durability of concrete under single-side salt-freezing–drying–wetting cycles. The improving effect of basalt fiber is better on the splitting tensile strength of concrete than the compressive strength. Basalt fiber exerts the best effect on reducing harmful holes in concrete. However, there is an optimal range of basalt fiber content, the performance of concrete will deteriorate with excessive fiber content. The cycles will destroy the hydration products of concrete and the synergistic effect between hydration products and fibers, but has little effect on the three-dimensional network constructed by basalt fibers. The pore structure of concrete is correlated with the mechanical properties of it under cyclic conditions, which is worth further study.
Through the design of this single-side salt-freezing–drying–wetting cycle test method more truly reflects the impact of the service environment on concrete (ordinary concrete, basalt fiber reinforced concrete).
Through the comparative study of macroscopic mechanical properties and microstructure, the failure mechanism of concrete (ordinary concrete, basalt fiber reinforced concrete) and the main strengthening mechanism of basalt fiber under single-side salt-freezing–drying–wetting cycle were revealed.
The correlation calculation proves that the mechanical properties of concrete (ordinary concrete, basalt fiber reinforced concrete) are highly correlated with porosity, pore size distribution and critical pore size under single-side salt-freezing–drying–wetting cycle.
The sensitive aperture of compressive strength and splitting tensile strength of concrete (ordinary concrete, basalt fiber reinforced concrete) under single-side salt-freezing–drying–wetting cycle is calculated, which provides a reference for further comprehensive analysis and calculation.
Mechanical Properties and Microstructure of Basalt Fiber Reinforced Concrete Under the Single-Side Salt-Freezing–Drying–Wetting Cycles
In the past, the salt freezing test does not often accord with the actual service environment of engineering, thus, we designed a test method of single-side salt-freezing–drying–wetting cycles. The mechanical properties and microstructure of ordinary concrete and basalt fiber reinforced concrete were studied. The mechanical property test is aimed at the splitting tensile strength and compressive strength of concrete after different cycles. The microstructure test is to study the hydration products by scanning electron microscope (SEM) and the pore structure of concrete by mercury intrusion porosimetry (MIP) test. The results indicate that the addition of basalt fiber can improve the compactness and pore structure of concrete. It is beneficial to enhance the durability of concrete under single-side salt-freezing–drying–wetting cycles. The improving effect of basalt fiber is better on the splitting tensile strength of concrete than the compressive strength. Basalt fiber exerts the best effect on reducing harmful holes in concrete. However, there is an optimal range of basalt fiber content, the performance of concrete will deteriorate with excessive fiber content. The cycles will destroy the hydration products of concrete and the synergistic effect between hydration products and fibers, but has little effect on the three-dimensional network constructed by basalt fibers. The pore structure of concrete is correlated with the mechanical properties of it under cyclic conditions, which is worth further study.
Through the design of this single-side salt-freezing–drying–wetting cycle test method more truly reflects the impact of the service environment on concrete (ordinary concrete, basalt fiber reinforced concrete).
Through the comparative study of macroscopic mechanical properties and microstructure, the failure mechanism of concrete (ordinary concrete, basalt fiber reinforced concrete) and the main strengthening mechanism of basalt fiber under single-side salt-freezing–drying–wetting cycle were revealed.
The correlation calculation proves that the mechanical properties of concrete (ordinary concrete, basalt fiber reinforced concrete) are highly correlated with porosity, pore size distribution and critical pore size under single-side salt-freezing–drying–wetting cycle.
The sensitive aperture of compressive strength and splitting tensile strength of concrete (ordinary concrete, basalt fiber reinforced concrete) under single-side salt-freezing–drying–wetting cycle is calculated, which provides a reference for further comprehensive analysis and calculation.
Mechanical Properties and Microstructure of Basalt Fiber Reinforced Concrete Under the Single-Side Salt-Freezing–Drying–Wetting Cycles
Int J Concr Struct Mater
Zeng, Hao (author) / Zhang, Jin (author) / Li, Yang (author) / Su, Xin (author) / Gu, CongZhi (author) / Zhang, Kai (author)
2022-12-01
Article (Journal)
Electronic Resource
English
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