This paper addresses the testing results of steel rods with grade A500 and A600, which used as a conventional reinforcement. It was investigated the strength properties of carbon and fiberglass sheets with different number of material layers. The results are compared with the data given in the quality certificates.

Keywords: fiberglass, carbon frp sheets, laminates, sheets of carbon and fiberglass, the ultimate load ,strength

The questions related to the study of various varying factors on the strength of normal sections in beams. Here's a program of research by one methodology designed to study the effect of the type and content of steel reinforcement and externally composite on the strength of normal sections that have not previously been investigated.

Keywords: Concrete, reinforced concrete, the percentage of reinforcement, carbon frp sheets, fiberglass, laminates

Some information was provided about the influence of type and percent of steel and composite reinforcement, on the strength and deformability in strengthened reinforced concrete beams. It was found, that the increment degree of strength in beams decreases by the increasing in percentage of steel reinforcement, especially, when a carbon fiber plastics with hot and cold hardening was used.

Keywords: Concrete, reinforced concrete, steel, composite, the reinforcement rate, the efficiency of strengthening , the varied factors, strength, limit strength, maximum allowable deflection, deformation.

An analysis for the influence, of type and quantity of steel and composite reinforcement, on the normal cracks development, at different load levels, and by the maximum allowable deflection in beams. It was Found that throughout the load range, the reference beams are most cracked. The reduction degree in crack width depends on the strength and percentage of the steel reinforcement.

Keywords: concrete, reinforced concrete, steel, fiberglass, carbon fiber, laminate, maximum allowable crack width, load level, the development of cracks, the relative width

It was provided some information about the character of crack formation and failure of prototypes, which strengthened by three deferent type of composite materials. It was fixed some increased in the crack’s number in beams which reinforced with glass fiber canvas, and 6 deferent mode of failure in strengthened beams.

Keywords: concrete, steel, anchor, composite materials, prototypes, failure modes, load level

Some information was provided about the experimental values ​​of crack width in reinforced concrete beams, which strengthened by three deferent types of glass and carbon fiber reinforced plastics. It was found that, when the strength and modulus of composite are increased, to the width in normal cracks is reduced. Having U-shaped clamps, anchors at the ends of the composite caused a greater reducing in their development. These factors should be considered in theoretical matters.

Keywords: Concrete, reinforced concrete, the reference beams, prototypes, cracks, crack width, the level of the composite reinforcement

An information, is given about the method of strengthening the tested samples by the general requirements of plant’s manufacturer for three types of composite materials. It was presented a dates about the application stages and control of the load intensity  

Keywords: Concrete, cement grout, notching, primer, putty, glue composition, stages of loading, the load level indicator, graduation

Provides information about the strength of the concrete, the size of the cross section of experienced beams, the options of their reinforcing and strengthening with various types of composite materials. Provides a scheme of testing with short-term load  

Keywords: Steel, concrete, reinforced concrete, strengthening, anchors, span , percentage of steel and composite reinforcement, load, failure

In this article considered the questions related to the strength of normal sections in reinforced concrete beams, in which steel reinforcement is completely or partially replaced by a fiberglass rod. It was established that the strength of such beams is less, but the strain is significantly higher compared to the traditional reinforced. Calculating with current standards dramatically overstates theoretical bearing capacity of these beams with composite reinforcement

Keywords: concrete, reinforced concrete, strength, normal sections, steel, fiberglass reinforcement GFRP, composite materials, research

In this article considered the questions related to the possibility of rational use of composite materials in the construction and strengthening of reinforced concrete structures during the reconstruction of buildings and structures. In RSUCE proposed research program which aimed to solving the neglected issues in this direction, and to create a secure calculating apparatus.

Keywords: polymer concrete, epoxy resin, composite materials, fiberglass and carbon plastic reinforcement (GFRP, CFRP rebar), prototypes, research.

In this article considered the questions related to how the deformability is influenced in concrete beams, in which steel reinforcement replaced with fiberglass GFRP or a combination (hybrid). The latter is very important, as the current standards do not account the increased in strength of composite reinforcement, whereas its elasticity modulus is lower than the elasticity modulus of steel reinforcement.

Keywords: concrete, reinforced concrete, strength, deformability, steel, fiberglass reinforcement GFRP, composite, the modulus of elasticity, deflection