Ensuring effective operation of structures in zones of aggressive media is associated with the task of studying, obtaining and developing composites of increased chemical resistance, strength and crack resistance. Structures based on corrosion-resistant materials (particularly polymer concretes) play a large role in solving these problems. One of these polymer concretes is rubber concrete or abbreviated as rubcon. This article is devoted to the study of the resistance of the external load to rubber concrete beams of a T-section. As a result of the experiments carried out on three series of rubber concrete T-beams with a different amount of longitudinal reinforcement, quantitative characteristics of the strength and crack resistance of their normal sections were obtained.
This article presents the results of testing the strength of samples of rubcon and fiber rubcon beams of a T-section, with a different percentage of longitudinal reinforcement. Rubber concrete (or abbreviated as rubcon) is a highly effective composite polymer concrete based on liquid rubber, which has favorable physical and mechanical characteristics, as well as almost universal chemical resistance to corrosive media. Bars of class A500C were used as longitudinal reinforcement; as transverse-Bp500, with a diameter of 5 mm and a step of 50 mm. Fiber reinforcement is represented by steel fibers with a diameter of 0.3 mm and a length of 30 mm (that is, a ratio of diameter to fiber length of 1/100) arranged randomly throughout the entire volume of the experimental beams. The section of the beams is assigned with the requirements of CR 63.13330.2012 “Concrete and reinforced concrete structures”: length - 1400 mm; web height - 95 mm; web width - 60 mm; flange height - 25 mm; flange width - 240 mm; the number and diameter of the longitudinal rebars - 0; 1Ø8; 1Ø10; 2Ø10; 2 Ø12 mm; which corresponds to the percentage of longitudinal reinforcement - 0; 0.80; 1.25;2.50; 3.60%.
The technique of experimental studies of bending elements of mixed reinforcement is described.
The results of testing beams for pure bending are presented. It is established that with an increase in the percentage of longitudinal reinforcement, the value of the destructive bending moment increases in a linear relationship. When adding fiber reinforcement, an increase in the values of the destructive bending moment is observed up to 10%.
The aim of this study is to determine the effect of fiber reinforcement on deformations arising from the applied load in the compressed flanges of reinforced rubber concrete beams of a T-section.This article presents the results of testing prototypes of rubber concrete and fiber rubber concrete beams of a T-section, tested to a pure bending. The strain curves for compressed flanges (3.6h’f , 4.8h’f , 8h’f overhangs) of reinforced rubber concrete beams of T-section are obtained.
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