The continuous, multi-layered, three dimensional micro-steel mesh exceeds UHPC in durability, ductility and strength. In addition to high compressive strength, durability and abrasion resistance of UHPC, micro-reinforced UHPC is characterized by extreme ductility, energy absorption and resistance to chemicals, water and temperature. Micro-reinforced ultra-high-performance concrete is the next generation of UHPC. Ongoing research into UHPC failure via tensile and shear failure is being conducted by multiple government agencies and universities around the world. The current types in production (Ductal, Taktl, etc.) differ from normal concrete in compression by their strain hardening, followed by sudden brittle failure. UHPC is also characterized by its constituent material make-up: typically fine-grained sand, silica fume, small steel fibers, and special blends of high-strength Portland cement. UHPC is characterized by being a steel fibre-reinforced cement composite material with compressive strengths in excess of 150 MPa (21750 psi), up to and possibly exceeding 250 MPa (36250 psi). Ultra-high-performance concrete is a new type of concrete that is being developed by agencies concerned with infrastructure protection. High-strength concrete has a compressive strength greater than 40 MPa (5800 psi). The aggregate to be made from quartz, and had some steel fibers in the mix. In 2007, the University of Tehran made several concrete cubes between 50,000 to 60,000 psi, and possible stronger. The strongest granite is about 30,000 psi. Rock of over 10,000 psi is considered hard. This could drop to 2 meters of 30,000 psi material. One GBUJ-57A/B can only penetrate 8 meters of 10,000 psi rock or concrete. The bomb can penetrate 200 feet of 5000 psi hardened concrete and is accurate enough for multiple hits on the same location to penetrate deeper targets or targets with even stronger concrete. A 2013 report stated that the development had been a success, and B-2 integration testing began that year. In 2012, the Pentagon requested $82 million to develop greater penetration power for the existing weapon. This is substantially larger than the deepest penetrating bunker busters previously available, the 5,000-pound (2,300 kg) GBU-28 and GBU-37.
Air Force, precision-guided, 30,000-pound (14,000 kg) “bunker buster” bomb. The GBU-57A/B Massive Ordnance Penetrator (MOP) is a U.S.
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