General Information

What is ComBAR®?
Schöck ComBAR® is a coated reinforcement bar made of high-strength glass fibres bond with vinyl ester resin. High quality materials and a unique manufacturing process result in an outstanding product with many advantages in comparison to common steel reinforcement.

What are the usual areas of application of ComBAR®?
ComBAR® can be applied to any civil engineering projects, in which restrictions concerning durability, corrosion and chemical resistance, chipping behaviour, electrical conductivity, magnetic properties or restrictions due to building biology prohibit the use common steel reinforcement. Frequent applications are:

Tunnelling – Opening areas of tunnel boring machines in shaft walls

Bridge construction – Decks, edge beams, barrier walls (non-corrosive reinforcement)

High Voltage Electricity Equipment – Fundaments of choke coils, rectifiers and bus bars

Research laboratories – non-magnetic reinforcement near sensitive equipment such as electron microscopes

Track construction – Reinforcement of slab tracks (high speed tracks and inner-city tram tracks) e.g. near signalling systems and track switches

Single family homes – non-metallic reinforcement in slabs to prevent distortion of the terrestrial magnetic field

What are the advantages of ComBAR® compared to stainless steel?
ComBAR® has twice the tensile strength of common reinforcing steel and a linear elasticity. Due to the absence of any metallic elements the material is completely resistant to corrosion, not electrically conductive and non-magnetic. Furthermore it is easy to machine, resistant to chemical attacks and benign in terms of building biology. As ComBAR® is not influenced by alloy surcharges, it is not vulnerable to price fluctuations as stainless steel.

What are the advantages of ComBAR® compared to epoxy-coated steel?
The additional coating of steel with epoxy resin is not as durable as ComBAR® in the long term. Humidity and UV radiation can dissolve the coating, even inside concrete, and cause corrosion. Damages to the coating during the installation of the bars can lead to pitting corrosion in the finished concrete element. As this process runs unobserved inside the element, it can result in a sudden failure of the concrete. ComBAR® is immune to both of these mechanisms and reaches a durability of 100 years.

What are the advantages of ComBAR® compared to other glass fibre bars?
The properties of available glass fibre bars on the market differ substantially. In Germany the ComBAR® bar with core diameter 16 mm is approved by the German Institute for Construction Technology (DIBt). The extension of the approval for diameters 8 – 25 mm is requested and is scheduled to be announced in the summer of 2012.

Schöck ComBAR® is the only material with creep rupture tests in compliance with Bulletin 40 of the fib (International Federation for Structural Concrete, Lausanne), which provides evidence of the rated value of the tensile strength for a lifespan of 100 years via time-to-failure relationship.

In addition, only ComBAR® possesses long-term bond tests, available for pre-stressed bars according to the ComBAR® approval. These tests were developed by the board of surveyors of the DIBt for glass fibre reinforcement to exclude zipper-like failure.

Contact

Hotline Team ComBAR®
Tel: +49 7223 967-449
Fax: +49 7223 967-490
combar@schoeck.de