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Impact Resistance of Concrete,
NATIONAL BUREAU OF STANDARDS WASHINGTON DC CENTER FOR BUILDING TECHNOLOGY
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A technical basis is being developed for selecting materials which can be used in constructing security barriers with improved penetration resistance. The first phase of the work is concerned with developing rational performance tests for evaluating the impact resistance of concrete. Three impact tests are currently being developed to determine the resistance of concrete to single impact, repeated impact, and to small arms and small projectiles. After the performance tests are developed, performance criteria will be proposed. Preliminary results from repeated impact tests indicate that steel fibers can substantially increase the impact resistance of concrete as compared to expanded metal and conventional steel bar reinforcing. Ultrasonic pulse velocity measurements appear to be useful in assessing the crack damage occurring during the repeated impact test.
APPROVED FOR PUBLIC RELEASE