技術論文
Study on Performance of PVA Fiber Reinforced Concrete Exposed for 10 Years to Seawater Spray
2018 年 16 巻 3 号 p. 159-169
詳細
2018 年 16 巻 3 号 p. 159-169
This paper reports the analytical and the experimental results of changes in the performance of PVA fiber reinforced concrete (FRC) exposed for 10 years to seawater spray. In this study, the specimens were FRC prisms with a corroded rebar and cracks in some areas, after having been maintained in a saline environment. In addition, a push-out test of the rebar in the specimens was conducted to examine changes in push-out load and crack width at surface in FRC. Furthermore, the salinity analysis, the measurement of initial crack widths, and the measurement of the corrosion amount of the rebar were performed.
As a result of the salinity analysis, it was confirmed that the chloride ion density of the concrete increased to around 9-12 kg/m3 by exposure to a seawater spray environment for 10 years. As a result of the chemical analysis of short fibers, the quality of the fibers in this study had not changed after the exposure.
As a result of the rebar push-out test, it was confirmed that fibers mixed into the concrete suppressed the enlarging of cracks immediately below the rebar. By this bridging effect of fiber, there was a tendency for new cracks to develop. The addition of fibers increased the load at the displacement of 2mm based on the rebar push-out test, and the load was proportional to the remaining tensile strength of FRC.
