How Using UHPC in Infrastructure Projects Saves Lives and Increases Security – LBM Research Associates

Amazing! How Using UHPC in Infrastructure Projects Saves Lives and Increases Security – LBM Research Associates

Information about How Using UHPC in Infrastructure Projects Saves Lives and Increases Security – LBM Research Associates

Phil Puccio

As unsettling as it may be, security is something we deal with on a daily basis today. Protection from intruders and explosions is now part of the planning and design process of many infrastructure projects, from buildings to bridges and beyond.

Ultra High Performance Concrete (UHPC) has been shown to provide a significant level of security to projects where explosion potential or physical intrusion is a threat to peace and harmony. Numerous studies in recent years have clearly demonstrated the increased safety of this innovative concrete material.

Learn more about what makes UHPC an explosion-proof concrete and delve into the tests to prove it.

What makes UHPC an explosive concrete

There are many Properties of UHPC that makes it superior to conventional concrete. When it comes to explosion resistance and safety, the following attributes make UHPC valuable for infrastructure projects:

Compressive strengthCompressive strength measures the ability of concrete to withstand loads that would result in a reduction in concrete size. While normal concrete has a compressive strength of about 4,000 pounds per square inch (psi), UHPC can often reach 30,000 psi or more when fully cured.

Tensile strength—Tensile strength is the ability of concrete to withstand breaking or cracking under tension. UHPC has a tensile strength of approximately 1,700 psi compared to 70 to 300 psi for normal concrete.

Ductility– Unlike normal concrete, UHPC can be stretched into thinner sections under tension.

Impact resistance—UHPC can absorb three times more energy than normal concrete. Under shock loads, UHPC has proven to be twice as strong as normal concrete and distributes up to four times as much energy.

Concrete proof that UHPC increases safety and explosion protection

Beam power from UHPC concrete beams

this to learn tested 21 beam samples examining the effects of the type of concrete used, steel reinforcement and other factors. Beams made from different combinations of concrete and steel reinforcement were subjected to pressure shocks until failure.

The results proved that UHPC beams can withstand higher explosive loads than those made of conventional concrete. When UHPC is also combined with a high-strength reinforcement, the explosion resistance is even higher.

Explosive behavior of single-use plate components made of UHPC

In this experiment, three single-use plates were tested for explosion resistance and damage tolerance. Two of the beams were made of UHPC and the third was made of traditional concrete.

The tests showed that the use of UHPC in panels improved the explosion resistance. It also increases resistance to damage and has fewer tensile cracks and secondary fragmentation. This study also confirmed that high strength steel reinforcements further improve explosion reduction.

Using ultra high performance concrete to mitigate impact and explosive threats

this to learn examined the performance of UHPC under a close-range explosion and tested materials with different fiber contents. The results showed that increasing the fiber content improves the explosion resistance. The UHPC also showed minimal fragmentation, unlike conventional concrete, which is another benefit in a blasting situation.

UHPC for explosion and ballistic protection

this to learn focuses on the application of UHPC to the construction of larger structures and objects used in security situations, such as bulkheads and bunkers. The researchers examined various UHPC compositions, including the type and amount of fiber reinforcements used.

Explosion field tests were carried out. The results showed that UHPC with greater flexural strength had greater explosion resistance. UHPC with a combination of fine-grain aggregates and steel fibers further improves the blast resistance.

Influence of design parameters on the explosion reaction of UHPC columns

Eight pillars (some made of conventional concrete and others made of UHPC) were tested with a simulated explosive charge. In addition to the type of concrete, the to learn also examined additional qualities such as fiber properties, fiber content, transverse reinforcement and strength.

Columns made with UHPC were more resistant to damage and showed less displacement when exposed to explosions. The use of UHPC has the ability to eliminate secondary blast fragments, which further increases human safety. The explosion resistance improved when the fiber content of the UHPC was increased from two to four percent.

Repeated penetration and different depth explosion of UHPC

The testers examined the impact of 14.5 mm projectiles and TNT explosives on UHPC samples. The TNT was embedded in the samples at various depths to determine the effect on damage.

the Results showed that steel fibers and coarse basalt aggregates within the UHPC composition improved penetration resistance, proving that the specific composition of the UHPC is important when it comes to explosion mitigation.

Cor-Tuf UHPC: Superior Blast Resistant Concrete

As the studies show, the composition of UHPC correlates directly with the explosion resistance and the protection offered. Contractors, builders, and engineers must be careful when designing and building for safety purposes to use a UHPC product that provides maximum protection.

Cor-Tuf UHPC is a proprietary blend of UHPC developed by the US Army Corps of Engineers. It was specifically designed to meet the need for a stronger, more resilient material to protect personnel and weapon systems from explosions and intruders without breaking the bank.

Cor-Tuf UHPC has a compressive strength of 28,000 psi to over 116,000 psi. It has a tensile strength of 2,700 psi (1,000 psi higher than the UHPC average).

Perhaps most importantly, Cor-Tuf UHPC can be developed in a unique mix design to meet the needs of any security project. The strength increase comes from the proprietary combination of integrated fibers that have been incorporated into the blend.

A variety of fibers can be used to achieve the desired strength and provide maximum explosion protection. Cor-Tuf UHPC stands out from other UHPC products in this area by honing and refining the proprietary ingredients that make up approximately 20 percent of its total composition (including fibers). Strict quality controls ensure that you get exactly the mix you need.

Cor-Tuf offers a combination of high strength and superior energy absorption capacity against explosions and ballistic penetration. The properties of this material make it suitable for a number of safety and security related applications including:

  • Protection against debris from tornadoes and hurricanes
  • Thin concrete armor plates for vehicles and fixed structures
  • Cheap ballistic armor
  • Explosion proof panels
  • Fragmentation ammunition protection
  • Burglar-resistant structural elements
  • Bank vaults
  • Armored protective housing

We are currently working with several military and government agencies on protections to make buildings and other structures safer. We are pleased to offer increased safety and explosion protection with Cor-Tuf UHPC, and we look forward to continuing our work to make our country safer.

Breaking Story – How Using UHPC in Infrastructure Projects Saves Lives and Increases Security – LBM Research Associates

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Category – Concrete

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