Abstract
In order to apply the ultra-high-performance fibre-reinforced concrete (UHPFRC) in the constructions of ballistic protective structures, the impact resistance of UHPFRC has been investigated experimentally by conducting the high-speed projectile penetration tests. 5 mixtures with basalt and corundum aggregates with various grain size have been prepared and subjected to the quasi-static and 7.62 x 54R B32 API projectile impact load using the striking velocity of 850 m/s. The influence of the strength, size and material of the aggregate on the projectile impact resistance represented by differential efficiency factor (DEF), structural integrity and area and height of impact crater has been evaluated. The superior projectile resistance of UHPFRC with corundum has been observed. Regarding the size of the aggregates, the incorporation of coarser aggregates brings better projectile impact resistance.
Highlights
During the lifespan, the structures may be exposed to several impact loading, such as car crash, blast or ballistic load
Higher compressive strength of corundum-based ultra-high-performance fibre-reinforced concrete (UHPFRC) to basaltbased UHPFRC has been observed, which indicates that the compressive strength of the UHPFRC increases with rising hardness/strength of the coarse aggregates
-The quasistatic compressive strength of the UHPFRC is improved by increasing the strength of the coarse aggregate
Summary
The structures may be exposed to several impact loading, such as car crash, blast or ballistic load. To increase the level of protection and defeat such intensive loadings, the UHPFRC is mainly used. This kind of concrete typically has extremely low water-binder-ratio, high amount of water reducer, high cement content and contains several admixtures as silica fume, micronized quartz, etc. The projectile impact resistance of common concrete is dependent on its compressive strength. For UHPFRC, this is not always valid and the projectile impact resistance cannot be inferred from the strength characteristics of the concrete. Based on the results of projectile penetration tests, it was described in [4] and [5] that the depth of the penetration has not been decreasing after the compressive strength of the concrete reaches a certain value of about 150 MPa
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