BLOK

DescriptionClick to view

Increased level of protection
The Dynablok wall system is based on a composition of reinforced concrete encased between two linked Dynablok panels. The composite material property allows the wall to increase its energy absorbent capability by allowing the wall to bend without spall up to a rotation angle of 8 degrees, nearly twice that of a regular reinforced concrete wall.

Easy to construct
The Dynablok wall system is designed to use the Dynablok panels as the formwork for concrete pouring, thus eliminating the need for complex formwork assembly and disassembly. Dynablok panels are designed with an interlocking mechanism and connectors which enable speed and ease of construction in theatre.

Environmental properties
The Dynablok walling system is recognised as a “green” building technology due to its use of recycled materials, which also provides excellent thermal and acoustic insulation as well as being fire-resistant.

Lightweight
The Dynablok panels are lightweight and easy to handle, resulting in nearly 30 percent reduced total wall weight compared to a typical concrete wall. This allows for better protection with less mass which results in smaller support footprints as well as an excellent solution for prefabricated elements.

Upgradeable solution
The Dynablok protective walling system can be easily upgraded by applying a Dynasystems Polymer retrofit layer to the Dynablok panels. The Polymer further increases the ability of the system to bend without spalling, thus increasing further the energy absorbent capabilities of the system.

Testing & certifications
The Dynablok wall system has undergone extensive government sponsored research and development programmes which comprised of laboratory tests, full scale explosive tests and analytical models. This was in order to develop a lightweight and easy to construct enhanced blast mitigation solution for deployment. The tests and trials on the Dynablok walling system have been undertaken and documented by a number of International Authorities including US Army Corps of Engineers, US TSWG, US Air Force Research Laboratories, NL TNO, UK MOD, UK DERA, and UK Royal Engineers.

SpecificationClick to view

 

Construction
Typical design of single layer and double layer DYNABLOK protective walls - total thickness, arrangement of layers & amount of reinforcement
depend on definition of threat.
Dynablok Construction
Typical design of retrofitting of existing structures with single layer of DYNABLOK™ protective walls - design thickness is determined by level of threat.
Dynablok Retrofit Construction
Soft Hardening
  • Core cut through a section of DYNABLOK™ Wall shows penetration of concrete into the pores of the wall panels, creating a strong bond.
  • Energies of both incoming pressure waves and reflected tension waves are partially dissipated and mitigated by the properties of the soft, open textured, energy-absorbing, sheathing material and by the confinement of the concrete core within this sheathing.
  • A bent DYNABLOK™ wall-panel / slab clearly demonstrates high flexibility of the element, reaching about 7º - 8º of rotation of the slab's free edges at the side supports, retaining its integrity without marked damage.
  • The tests results demonstrate that with less concrete a DYNABLOK™ slab can carry almost 38% more load than a reinforced concrete one and deflects much more before breaking - a clear indication of its energy absorption capacity.
 
Blast Effects
Typical form and parameters of blast shock wave as derived from charge type, charge weight and charge distance from face of target - calculated by the USA Corps of Engineers’ software CONWEP.

 Sample of Blast Shock Wave Caused by Explosion

External and Internal balance of energies activated by blast impulse on target and sustained by structural properties.
 Forces of Action and Reaction on a Segment of Target Wall
Propagation of pressure shock waves, caused by blast's impulse, through a wall's media and their reflection from back-side as tension waves that crack the media & cause spalling of debris.
 Dynablok Reaction to Blast
 Ballistic Effects
Propagation of pressure shock waves, caused by projectile's impact, through a wall's media and their reflection from back-side as tension waves that crack the media, create "tunnel" of crushed material and cause spalling of debris.
Projectile's Impact Effects on Wall Target
Injury-Threshold

Definition
The "Injury-Threshold" is defined as:
• "The maximum impulse which may damage the attacked structure but still does not harm the sheltered people".

• Empirical observations found that "Injury-Threshold" is reached when the width of cracks in concrete walls reach 5 mm - the beginning of spalling effect.

Demonstration
• A wall target of reinforced- concrete after direct hit by NATO M107 155mm artillery shell - at the phase of "injury-threshold".
* Note: 5 mm wide cracks precede the appearance of spalling.

 
Dynablok ISO-Impulse Graph Blast Resistance at "Injury-Threshold"

• The "Iso-Impulse" graphs shown, provide a simple ‘Design Chart’ showing the Thickness of the DYNABLOK™ wall required to withstand blast effects – depending on the size of the Explosive Charge and the Distance from the Target.
 

 • The Chart is based on charts presented in the manual TM-5-855 of the USA Corps of Engineers and on CONWEP software.

GalleryClick to view