Abstract
Abstract Deep penetration experiments were performed on five types of concrete with different coarse aggregate content. The projectile diameter was 29.9 mm, the initial velocity was 647 m/s, and the volume fraction of the coarse aggregate was between 0% and 59.0%. The damage laws and damage mechanism of the target were analyzed. The pure mortar target had the smallest radial crack origin diameter and crater depth. Too high of the coarse aggregate content led to the formation of many voids, which led to the disappearance of radial cracks, crater surface bypassing the coarse aggregate and a large reduction of crater diameter. The influence laws and mechanism of the coarse aggregate on the penetration depth were also analyzed. The increase of volume fraction of coarse aggregate was beneficial to reducing penetration depth and the increase of voids volume fraction was opposite. The penetration depth was the lowest when the volume fraction of the coarse aggregate reached the maximum and no voids formed. By modifying the static resistance stress in the Forrestal penetration formula, a penetration depth model considering the volume fractions of the coarse aggregate and voids was established. The predicted results were in good agreement with the experimental results.
Highlights
Concrete is widely used in military and civil fields, such as the subterranean command centers, nuclear reactor containments, bridges and dams
The resistance of part 2 in the concrete target and mortar target were basically the same, which was due to the fact that the mortar was interconnected and easy to compress, so it was less affected by the coarse aggregate
When the coarse aggregate volume fraction is less than 59.0%, an increase in the volume fraction of the coarse aggregate has a limited influence on the compressive strength, while the traditional penetration depth formula mainly uses the compressive strength to characterize the performance of the concrete
Summary
Concrete is widely used in military and civil fields, such as the subterranean command centers, nuclear reactor containments, bridges and dams. Studying the influence of the coarse aggregate content on the damage and penetration depth of concrete is necessary. Zhang et al (2012) studied the influence of the coarse aggregate size on the crater diameter and penetration depth, and the penetration depth was less than 7 times of the projectile diameter. Dancygier et al (2007) studied the effects of maximum coarse aggregate size and type on the perforation limit and front and rear face crater diameter of thin target. Dancygier et al (2014) studied the effect of maximum coarse aggregate size on the damage and penetration resistance of double layer thin target. Cheng Wu et al Study of the anti-penetration performance of concrete with different coarse aggregate content than 6 times the projectile diameter. Based on the Forrestal penetration theory, a theoretical model of the penetration depth, considering the volume fractions of the coarse aggregate and voids, was developed and compared with both the commonly used penetration formula and experimental results
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