Abstract
This study investigates the blast resistance of fiber-reinforced cementitious composite (FRCC) panels, with fiber volume fractions of 2%, subjected to contact explosions using an emulsion explosive. A number of FRCC panels with five different fiber mixtures (i.e., micro polyvinyl alcohol fiber, micro polyethylene fiber, macro hooked-end steel fiber, micro polyvinyl alcohol fiber with macro hooked-end steel fiber, and micro polyethylene fiber with macro hooked-end steel fiber) were fabricated and tested. In addition, the blast resistance of plain panels (i.e., non-fiber-reinforced high strength concrete, and non-fiber-reinforced cementitious composites) were examined for comparison with those of the FRCC panels. The resistance of the panels to spall failure improved with the addition of micro synthetic fibers and/or macro hooked-end steel fibers as compared to those of the plain panels. The fracture energy of the FRCC panels was significantly higher than that of the plain panels, which reduced the local damage experienced by the FRCCs. The cracks on the back side of the micro synthetic fiber-reinforced panel due to contact explosions were greatly controlled compared to the macro hooked-end steel fiber-reinforced panel. However, the blast resistance of the macro hooked-end steel fiber-reinforced panel was improved by hybrid with micro synthetic fibers.
Highlights
Reinforced concrete (RC) structures, which can be used semi-permanently because of their high strength and high durability, are used for infrastructure and military facilities
The objective of this study was to experimentally clarify the effect of fiber reinforcements on the local damage of fiber-reinforced cementitious composite (FRCC) panels subjected to contact explosions
Based on the experimental results, the main findings of this study, which are useful information for blast resistance of FRCCs, are drawn as follows: 1. For FRCCs, the fracture energy of PVASCC and PESCC is greater than that of steel fiber-reinforced cementitious composite (SCC), which shows the influence of hybrid macro and micro fiber on FRCC flexural performance
Summary
Reinforced concrete (RC) structures, which can be used semi-permanently because of their high strength and high durability, are used for infrastructure and military facilities. In recent years, terrorist activities and accidental explosions have caused damage to RC structures. These incidents result in the loss of human life and significant damage to properties of national interest (Luccioni et al 2004; Osteraas 2006; Islam and Yazdani 2008). Blast and impact load caused by explosions and physical conflict must be considered in the design of protective structure systems for improved safety. In the case of local damage of RC panels subject to explosive loads, it is important to suppress the spall of the panel in terms of secondary damage caused by scattering of concrete fragments (McVay 1988).
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