Abstract
Ultra-high-performance steel-fibre-reinforced concrete (UHP-SFRC) is a technologically advanced composite with a high ability to absorb and dissipate mechanical energy. This work investigates the possibility of increasing ballistic resistance by adding different percentages of corundum and basalt aggregate into this type of concrete. The most common type of ammunition, a 7.62 mm × 39 mm calibre with a full-metal jacket and a mild-steel core (FMJ-MSC), was used to test all samples. The size of the damage and the mode of failure were determined using a 3D scanner operating on the principle of photogrammetry. The experimental campaign showed that the addition of basalt and, especially, corundum aggregate has a positive effect on ballistic resistance. In particular, the increase in compressive strength and the slight decrease in depth of penetration (DOP) was observed in the case of the usage of the corundum aggregate.
Highlights
The European and global geopolitical situation has changed in recent years, and as a result, many questions have been raised about the security of the population and of the members of the security forces of individual states
When the standard deviations of the measurements are taken into account, it can be said that the depth of penetration (DOP) does not show a significant dependence on the amount of corundum aggregate added
In the case of basalt, from 30% replacement of silica sands by basalt, the depth of penetration was reduced to a value similar to that of the corundum aggregate
Summary
The European and global geopolitical situation has changed in recent years, and as a result, many questions have been raised about the security of the population and of the members of the security forces of individual states. One of these issues is the production and development of protective structures that can increase the safety of the population or the intervening units. Great care must be taken concerning the properties of the individual components of the composite, including their interaction together with the parameters of the applied loads
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