Building elements often must be restored or even replaced because of corrosion damage to the steel reinforcement, leading to a destruction of the concrete structure. This is particularly true for components exposed to de-icing salt. With the deployment of GRP reinforcements, corrosion is an issue of the past. It drastically reduces the number of repairs needed to the construction components. GRP reinforcements are mainly applied to concrete and polymer concrete building parts.


Material Properties

Dimension Tolerances


Comparison of Steel- and GRP Reinforcements

Characteristics Steel Reinforcement GRP Reinforcement
Material Steel GRP
Tensile strenght, Mpa 360-390 1200-1300
E-Module, Mpa 200000 60000
Elongation at fracture, % 25 2,2
Lin. expansion-
coefficient, 10-6/K
13-15 9-12
Density, kg/dm³ 7 1,9
Length 6-12 m 6 m or at request
Corrosion- and
chemical resistance
no yes
Thermal conductivity yes no
Dielectric no yes
Radiotranslucent no yes
Insensitive to 
electromagnetic fields
no yes
life expectancy 30 years 100 years

Advantages over steel

  • resistant to corrosion and acids
  • extended service life
  • no maintenance required
  • lightweight with high tensile strenght
  • permeable to magnetic fields and radio frequencies