Abstract
The technology for pre-stressing and anchoring of the composite rebar was developed. It makes possible to reinforce concrete products and produce the contact line supports of high quality, which possesses advantages in comparison with the steel reinforced concrete. The prototypes of supporting structures with the use of the composite BFRP reinforcement were developed. They were tested for strength, rigidity and crack resistance. In the course of testing, the value of a pole deflection in the plane of the application of the control load was determined. Poles with composite reinforcement (with vibratory load and after vibratory load) and steel reinforced poles were tested and compared. Results obtained show that the vibratory load had no significant impact on the properties of supports reinforced with pre-stressed composite rebars and confirm the practical possibility to use them. In the future, it is necessary to develop the working drawings for the replacement of the steel reinforcement by a composite polymer rebar and the technical requirements for supports of the contact lines of Russian Railways as well as the technical regulations for their design and manufacturing.
Highlights
In recent years, many types of composite polymer reinforcements have appeared on the construction market
Results obtained show that the vibratory load had no significant impact on the properties of supports reinforced with pre-stressed composite rebars and confirm the practical possibility to use them
Tests were carried out in accordance with GOST 19330 for two poles reinforced with the composite reinforcement that passed vibration loading, for two poles reinforced with the composite reinforcement without vibration loading, and for two new steel reinforced concrete poles without vibration loading
Summary
Many types of composite polymer reinforcements have appeared on the construction market. Noting the positive properties of the reinforcement, its disadvantage, i.e. low modulus of elasticity compared to steel reinforcement, is often indicated [2] This property and a distinctive feature of the composite reinforcement may be exploited to the greatest possible extent in prestressed structures. The reinforced concrete poles have become very popular as line support in recent years They have greater mechanical strength, longer life and permit longer spans than steel. It is known that reinforced concrete line supports are subject to electrochemical corrosion caused by stray currents. In this regard, the lighter diamagnetic composite reinforcement, which is a dielectric and effectively works in structures under the influence of aggressive environments, is extremely attractive
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