Scientists have created hollow concrete that is 5.6 times stronger than radiation concrete. The new design is based on the human femur, which features a honeycomb-like design, making it more resilient to breaks and cracks.
This added resiliency, indeed, comes from the hollowed-out shapes that appear within the concrete. Because of the holes within the material, when cracks and breaks occur, they no longer stretch the entirety of the concrete block. Instead, they only crack until they reach the first break, at which point the crack stops, allowing the concrete block to continue withstanding the pressure.