Compared with the steel armature the FRP-Rebar has a lot of advantages

it is stronger than the steel armature in 1,5-2 times;

it weighs 3,5-4 times less than the steel armature;

it has the high module of elasticity when the relative extension coefficient is low. Besides it has strong durability as respects to stress loads and also possesses good flow curves;

it doesn''t corrode, changes its mechanical properties rather weakly under the influence of acids, salts and alkalis;

it is a dielectric and also is radio transparent and magnetically inactive (the change of strength properties of FRP-Rebar under the influence of electromagnetic field is excluded);

it keeps its strength properties under the influence of ultralow temperature;

the thermal expansion coefficient of the FRP-Rebar corresponds to the thermal expansion coefficient of the concrete then that excludes breaks in the reinforcing and cracks formation in the protective layer of concrete under the influence of temperature cycles;

the coefficient of heat conductivity of the FRP-Rebar is low tenfold than the one of the steel armature (it is commensurable with the wood). The FRP-Rebar is the basic reinforcing material for multilayered heat saving building constractions, it provides an effective heat insulation and the absence of cold bridges during the long operation life of the multilayered heat-insulative wallings and facades, all these characteristics are achieved owing to the low coefficient of heat conductivity, high corrosion resistance and the absence of gradient frost actions of the heater in length of the armature.

Comparative parameters of FRP-Rebar with steel armature

Parameters Steel armature (A400C)
GOST 5781-82
FRP-Rebar
Material Steel 35GS, 25G2S and other ASP — glass fibers in diameter of 13-16 micron reinforced polymers;
ABP — basalt fibers in diameter of 10-16 micron reinforced polymers
Failing stress at a stretching, MPa 700-900 800-ASP
1200-ABP
Tensile modulus, MPa 25000-35000 30000-ASP
40000-ABP
Elongation, % 25 2,2-ASP and ABP
Character of behavior under loading (dependence "stress-deformation") Curve with a platform of fluidity under a loading Linear dependence under loading before destruction
(Fig. 1)
Density, t/m³ 7 1,9-ASP and ABP
Corrosion resistance excited environments Corrodes with excretion of products of a rust Corrosion-proof material of the first group of reagent resistance, including to an alkaline condition of concrete
Thermal conductivity warmly spent not warmly spent
Electrical conductivity spends an electric current dielectric
Longevity till 40 years till 80 years
Replacement of armature on physic-mechanical properties 6A-SH
8A-SH
10A-SH
12A-SH
14A-SH
16A-SH
18A-SH
5ASP, 5ABP
6ASP, 6ABP
8ASP, 8ASP
10ASP, 10ABP
12ASP, 12ABP
14ASP, 14ABP
16ASP, 16ABP
Parameters of a matrix from armature, identical strength, at a loading 25 t/m² At use of armature 8A-SH the size of a cell 14×14cm. Weight of 5,5 kg/m At use of armature 8ASP the size of a cell 23×23 cm. Weight of 0,61 kg/m².Reduction of weight in 9 times.

The typical characteristic stress-deformation at a tensile


Fig. 1