Abstract
This paper experimentally investigates the blast-resistant characteristics of hybrid fiber-reinforced concrete (HFRC) panels by contact detonation tests. The control specimen of plain concrete, polypropylene (PP), polyvinyl alcohol (PVA) and steel fiber-reinforced concrete were prepared and tested for characterization in contrast with PP-Steel HFRC and PVA-Steel HFRC. The sequent contact detonation tests were conducted with panel damage recorded and measured. Damaged HFRC panels were further comparatively analyzed whereby the blast-resistance performance was quantitively assessed via damage coefficient and blast-resistant coefficient. For both PP-Steel and PVA-Steel HFRC, the best blast-resistant performance was achieved at around 1.5% steel + 0.5% PP-fiber hybrid. Finally, the fiber-hybrid effect index was introduced to evaluate the hybrid effect on the explosion-resistance performance of HFRC panels. It revealed that neither PP-fiber or PVA-fiber provide positive hybrid effect on blast-resistant improvement of HFRC panels.
Highlights
In recent decades, terrorist attacks on buildings and infrastructure has become a global threat [1,2,3].To protect civilian lives from possible terrorist attacks, civil infrastructure should provide resistance to extreme loads such as impact and blasts
The blast-resistant performance improvement was only achieved by 1.5% steel + 0.5% PP hybrid fiber reinforcement case
hybrid fiber-reinforced concrete (HFRC) specimen with PP + Steel fiber, and polyvinyl alcohol (PVA) + Steel fiber were further analyzed with uniaxial compression, 3-point bending tests and contact detonation tests
Summary
Terrorist attacks on buildings and infrastructure has become a global threat [1,2,3]. To protect civilian lives from possible terrorist attacks, civil infrastructure should provide resistance to extreme loads such as impact and blasts. HFRC shows improved structural behavior compared to conventional concrete, such as less spalling and scabbing under impact loadings [3,25,26,27]. Some work dealt with the blast or impact resistance performance affected by fiber content and type [9,37,38], since the extreme loading tests are costly and even dangerous. The hybrid fiber-reinforced UHPC samples exhibited much smaller cracks than the single steel fiber-reinforced UHPC samples because small-sized PVA and basalt fibers were able to effectively control the micro-cracks. The hybrid effect index is introduced to determine the positive or negative roles played by PP and PVA-fiber
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