INVESTIGATION OF PHYSICAL AND MECHANICAL PROPERTIES OF FIBERGLASS REINFORCEMENT AND IT’S FIXING IN CONCRETE WARES

Abstract

An important direction in improving the construction industry of modern reinforced concrete structures is the expansion of the use of prestressed elements using effective types of fiberglass reinforcement. High strength fiberglass reinforcement with a small specific gravity, corrosion resistance, unique chemical resistance are main advantages over by steel. The performance of prestressed reinforced concrete structures is largely determined by the adhesion of reinforcement to concrete, the work of the end sections of structures that are bent. One of the real ways to solve the problem is the use of high-strength unidirectional fiberglass as a reinforcing material for concrete, polymer concrete and wooden structures.

In existing world practice, the main method for assessing the adhesion of reinforcement to concrete is the RILEM / CEB / FIP beam method, which involves bending special samples of a concrete beam. The beam consists of two halves connected to each other in the stretched zone by the tested reinforcing bars, and in the compressed zone by a hinge in the form of two embedded parts and a steel cylinder between them. The appearance of new transverse cracks developing along the reinforcement complicates the stress state of the structures and disrupts the joint work of the reinforcement and concrete without ensuring adhesion of these multimodular materials.

This work is devoted to the determination of the physico-mechanical characteristics of fiberglass reinforcement, which were determined by tensile testing in a  testing machine according to the standard method. To fix reinforcement samples in a tensile testing machine, were developed "anchor-glasses". Also considered is the calculation of the length of anchor reinforcement in concrete, based on existing regulatory documents in construction, and the identification of factors affecting the adhesion of reinforcement to concrete for possible further use to reinforce reinforced concrete structures.