Abstract
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.
Highlights
Over the past several decades, a massive number of concrete structures have been constructed in many countries
Two cylindrical specimens are tested to measure the compressive behavior of high-performance fiber-reinforced cement composite (HPFRCC)
The result indicates that the average compressive strength of HPFRCC is 42.6 MPa
Summary
Over the past several decades, a massive number of concrete structures have been constructed in many countries. These structures have suffered from safety and serviceability problems due to the deterioration of concrete. The penetration of water, chloride and other aggressive ions into concrete is the most important factor in the deterioration of concrete [1]. Of these ions, the chloride ion poses the most significant durability problems, because it causes the corrosion of the steel reinforcement embedded in concrete. The service life of such concrete structures decreases due to a lack of safety and serviceability [2]
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