UHPC (ultra high performed concrete)
 

UHPC is high strength concrete with a cement core reinforced with steel fibres. The combination of concrete and steel provides excellent properties of both tension and compression, in an order of multiples compared to standard concrete. The most important advantage is the concrete's ability to absorb the large amounts of energy caused by xplosions, impacts, and blast waves.

UHPC (Ultra High Performed Concrete) material was developed and later tested at the CTU in Prague based on long-term cooperation between the Czech Technical University in Prague - Department of Concrete and Masonry Construction and the University of Defence in Brno - Department of Engineering Technologies. This material has poperties suitable for use in protective constructions increasing the resistance of infrastructure and safety of persons.

The following working diagram of the material clearly shows the ability of this material to significantly better absorb and dissipate mechanical energy and this is the key feature of its protective elements.

This product can prevent attacks of the perimeter by truck and in cases such as a terrorist attack in Nice July 14, 2016, when the truck drove into the crowd (Renault Midlum truck, 12 tons + 17 tons of cargo, speed of 90 km / h), or in Berlin December 19, 2016 (Scania truck, 15 tons + 15 tons of cargo, speed of 65 km / h).

 

Impact of truck (22 tons, speed of 100 km/h) to common resistant concrete.

Impact of truck (22 tons, speed of 100 km/h) to developed security UHPS element, absorption of kinetic energy.

 

 

Barrier test of common concrete

Barrier test cover video for the media. The bus should be stopped by crash barriers, as a rescue backup is the second barrier of concrete slabs. Journalists are watching all this from a safe distance. Can you guess how the test turned out?"
 

Bus versus common concrete block.

UHPFRC při zkoušce pevnosti v tlaku - charakteristická hodnota pevnosti v tlaku u těchto betonů je 150 -250 MPa

UHPFRC při zkoušce pevnosti v tlaku - charakteristická hodnota pevnosti v tlaku u těchto betonů je 150 -250 MPa

 

MATHEMATICAL MODEL - NUMERICAL SOLUTION

The material's properties have been verified using software simulation in ANSYS-AUTODYN. Two basic types of blast wave interaction on an UHPC slab were solved – the first is an explosion of plastic explosive on the surface of the slab and the second is an explosion of TNT at a certain distance from the slab and its interaction with the blast wave. All simulations were
tested in the AUTODYN system.

UHPC material has been tested for distant explosions, contact explosions and projectile penetration. Tests on the material have been carried out according to NATO standards. Ballistic resistance of the tested slabs was tested in accordance with NATO standards - STANAG 2280 - Design Threat Levels and Handover Procedures for Temporary Protective Structures.
All protective structures used in foreign operations are tested according to this standard.

 


CONCRETE ELEMENT FOR THE PROTECTION OF PERIMETERS

 

This prefabricated UHPC element prevents the penetration of vehicles into the protected installation.

This element will be able to absorb the kinetic energy of a moving vehicle in an order of units of MJ. This corresponds to the weight of the element, its structural integrity and tits high stopping ability shape.

Our designed elements look like additional architectural elements with a certain aesthetic value and their protective function is not immediately apparent.


CONCRETE PROTECTIVE ELEMENT FOR INTERIORS

 

Spacious interiors with high concentrations of people are very attractive and popular
targets for terrorist attacks, as can be seen from recent events in Europe.

The unique design and engineering solutions of our proposed elements along with their appropriate placement can significantly contribute to a reduction in the consequences of such attacks. Firstly they provide protection against flying shrapnel or projectiles and secondly they ecrease the effects of the blast wave from the explosion by absorption and diversion.

The interior elements will appear to be an integral part of the structure and regular visitors to the space will not able to recognize their protective function.

Simulation of explosion


CONCRETE ELEMENT FOR THE PROTECTION OF CABLE MANAGEMENT (ENGINEERING NETWORKS)

 

In any important government installation or commercial complex a certain amount of networks can be found which are of importance to the infrastructure of a country. These networks are crucial for maintaining the functionality of such buildings and appropriate attention to their protection should therefore be given.

Preferentially great attention is paid to the issue of ensuring cyber security, while the security of networks against mechanical damage during an attack is of equal importance.

We have designed a protective channel which is able to replace a significant amount of soil cover. It is very well suited for temporary installations or repairs and is highly resistant to mechanical damage.

Cable managment protection modules