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Durability of Steel Fiber-Reinforced Concrete Containing SiO2 Nano-Particles

1
School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450001, China
2
Changjiang River Scientific Research Institute of Changjiang Water Resources Commission, Wuhan 430010, China
3
Departmen of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA 50011, USA
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(13), 2184; https://doi.org/10.3390/ma12132184
Received: 7 May 2019 / Revised: 20 June 2019 / Accepted: 2 July 2019 / Published: 7 July 2019
(This article belongs to the Section Construction and Building Materials)
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Abstract

An experimental study was conducted to investigate the effect ofnano-SiO2 and steel fiber content on the durability of concrete. Five different dosages of nano-SiO2 particles and five volume dosages of steel fiber were used. The durability of concretes includes permeability resistance, cracking resistance, carbonation resistance, and freezing-thawing resistance, and these were evaluated by the water permeation depth, number of cracks, total cracking area per unit area of the specimens, carbonation depth of the specimens, and the relative dynamic elastic modulus of the specimens after freezing-thawing cycles, respectively. The results indicate that the addition of nano-SiO2 particles significantly improves the durability of concrete when the content of nano-SiO2 is limited within a certain range. With the increase of nano-SiO2 content, the durability of concrete first increases and then decreases. An excessive number of nano-SiO2 particles could have an adverse effect on the durability of the concrete. The addition of the correct amount of steel fibers improves the carbonation resistance of concrete containing nano-particles, but excessive steel fiber reduces the carbonation resistance. Moreover, the addition of steel fibers reduces the permeability resistance of concrete containing nano-particles. The incorporation of steel fiber enhanced the freezing-thawing resistance and cracking resistance of concrete containing nano-particles. With increasing steel fiber content, the freezing-thawing resistance of the concrete containing nano-particles increases, and the cracking resistance of the concrete decreases gradually. View Full-Text
Keywords: steel fiber; concrete; durability; nano-particle steel fiber; concrete; durability; nano-particle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, P.; Li, Q.; Chen, Y.; Shi, Y.; Ling, Y.-F. Durability of Steel Fiber-Reinforced Concrete Containing SiO2 Nano-Particles. Materials 2019, 12, 2184.

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