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Chloride Permeability of Damaged High-Performance Fiber-Reinforced Cement Composite by Repeated Compressive Loads

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Center Manager, JNT INC, Korea
2
Department of Civil Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea
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Author to whom correspondence should be addressed.
Materials 2014, 7(8), 5802-5815; https://doi.org/10.3390/ma7085802
Received: 24 June 2014 / Revised: 18 July 2014 / Accepted: 4 August 2014 / Published: 11 August 2014
(This article belongs to the Section Advanced Composites)
The development of cracking in concrete structures leads to significant permeability and to durability problems as a result. Approaches to controlling crack development and crack width in concrete structures have been widely debated. Recently, it was recognized that a high-performance fiber-reinforced cement composite (HPFRCC) provides a possible solution to this inherent problem of cracking by smearing one or several dominant cracks into many distributed microcracks under tensile loading conditions. However, the chloride permeability of HPFRCC under compressive loading conditions is not yet fully understood. Therefore, the goal of the present study is to explore the chloride diffusion characteristics of HPFRCC damaged by compressive loads. The chloride diffusivity of HPFRCC is measured after being subjected to various repeated loads. The results show that the residual axial strain, lateral strain and specific crack area of HPFRCC specimens increase with an increase in the damage induced by repeated loads. However, the chloride diffusion coefficient increases only up to 1.5-times, whereas the specific crack area increases up to 3-times with an increase in damage. Although HPFRCC shows smeared distributed cracks in tensile loads, a significant reduction in the diffusion coefficient of HPFRCC is not obtained compared to plain concrete when the cyclic compressive load is applied below 85% of the strength. View Full-Text
Keywords: chloride permeability; high-performance fiber-reinforced cement composite (HPFRCC); compressive damage chloride permeability; high-performance fiber-reinforced cement composite (HPFRCC); compressive damage
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Lee, B.J.; Hyun, J.H.; Kim, Y.Y.; Shin, K.J. Chloride Permeability of Damaged High-Performance Fiber-Reinforced Cement Composite by Repeated Compressive Loads. Materials 2014, 7, 5802-5815.

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