Ballistic Concrete Barrier for High-Power Bullet Absorption
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Solution Overview
Problem
Current ballistic concrete barriers, such as SACON®, are ineffective in stopping very high power fifty caliber bullets, allowing penetration depths of 18 inches or more, which poses a safety risk and limits flexibility in training exercises, as conventional backstops may not be 100% effective for such high power weapons.
Innovation Solution
A bullet absorbing component comprising Portland cement, fine aggregate, fiber, calcium phosphate, aluminum hydroxide, and an air entrainment additive, mixed to achieve a specific density, capable of stopping fifty caliber bullets in less than 10 inches, allowing for safer and more flexible training with high power ammunition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ballistic concrete barriers (SACON®) are used, then they can stop low power projectiles and eliminate ricochets, but they allow fifty caliber bullets to penetrate 18 inches or more
Solution Approach 1:
The patent modifies the concrete composition by adjusting key parameters: replacing a portion of Portland cement with Class F fly ash (10-50% by weight), incorporating specific fiber types and amounts (0.5-2% by weight), and optimizing aggregate ratios. These parameter changes transform the material properties to achieve superior bullet stopping capability with reduced penetration depth compared to conventional SACON®
Solution Approach 2:
The invention creates a composite concrete material combining multiple components: Class F fly ash, Portland cement, silica fume, various aggregates (fine and coarse), steel fibers, and chemical admixtures. This composite structure synergistically enhances bullet resistance while maintaining workability and reducing penetration depth through the combined effects of pozzolanic reaction, fiber reinforcement, and optimized aggregate interlocking
2Stability of the object's composition
If fiber reinforced foamed concrete is used, then it resists breakdown and prevents ricochets, but it cannot reliably stop very high power fifty caliber bullets
Solution Approach 1:
The patent develops a composite concrete system integrating steel fibers (0.5-2% by weight) with Class F fly ash and Portland cement. The steel fibers provide tensile reinforcement and crack resistance, while the fly ash-cement matrix offers compressive strength and chemical stability. This composite structure simultaneously achieves resistance to environmental breakdown and reliable stopping of fifty caliber bullets
Solution Approach 2:
The invention optimizes local material properties by distributing steel fibers uniformly throughout the concrete matrix and creating a graded aggregate structure. The fiber reinforcement concentrates strength where needed (at potential crack paths), while the fly ash provides localized pozzolanic activity that densifies the matrix, together enabling both durability and high-velocity bullet resistance
3Ease of manufacture
If conventional concrete mixtures are used, then they are easy to manufacture, but they do not provide sufficient stopping power for fifty caliber bullets without excessive thickness
Solution Approach 1:
The patent maintains ease of manufacture by using standard concrete mixing equipment and procedures, but changes the material parameters: substituting 10-50% of Portland cement with Class F fly ash, adding 0.5-2% steel fibers by weight, and optimizing water-cement ratios. These parameter adjustments enhance bullet stopping power without requiring specialized manufacturing processes or excessive concrete thickness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The improved components effectively stop fifty caliber bullets in 4-8 inches, significantly reducing the risk of penetration and enabling more reliable and versatile training scenarios, including live-fire exercises with other small arms or grenades, while maintaining low failure rates and environmental safety by minimizing lead leaching.
Implementation Method 1
about 0.0005 to 0.05 part by mass air entrainment additive
Data Source
AI summary
This disclosure is directed to an improved ballistic concrete barrier for stopping projectiles with a kinetic energy of between about 1.0 kJ (750 foot-pounds) and 20.3 kJ (15,000 foot-pounds) in between about 3 inches and 10 inches. In one embodiment, the ballistic concrete barrier comprises (a) about 1 part by mass Portland cement; (b) about 0.5 to 1.5 part by mass fine aggregate; (c) about 0.005 to 0.15 part by mass fiber; (d) about 0.005 to 0.05 part by mass calcium phosphate; (e) about 0.005 to 0.05 part by mass aluminum hydroxide; and (f) about 0.0005 to 0.05 part by mass air entrainment additive, such that the ballistic concrete barrier is capable of stopping a fifty caliber bullet in less than 10 inches from a point of entry into the barrier.