Comparative analysis of strength and crack resistance of normal sections of bent elements of T-sections, made of rubber concrete, kauton reinforcement and concrete

Abstract

Abstract.One of the urgent tasks of development of the construction associated with the development of new building designs, the use of which provides increased strength, crack resistance, reducing the flow of construction materials, reducing the labor intensity, energy consumption and cost. Ensuring effective functioning of structures during their operation in the harsh environments associated not only with the task of developing materials of higher strength and corrosion resistance, but also composites of increased strength and crack resistance, as structural materials crack resistance is largely determined by the ability of the structure to prevent the formation and growth of cracks. For structures operating in conditions of chemical action, the question of crack resistance is paramount, as the disclosure of cracks in aggressive environment, penetrating deep into the section and causing corrosion of the reinforcement will significantly impair the ability of the load bearing capacity of the element as a whole. The results of experiments of polymer concrete beams of the cross T-profile and comparison of the results with those obtained in an experiment similar to concrete and kauton reinforced elements are given. The observations of the stress-strain state of polymer concrete of flexural members, strength and crack resistance of these elements are presented.

Crack Resistance of Reinforced Concreted and Reinforced Rubber Concrete Beams

“…As a result of studies of rubber concrete [1,2] and structures based on it [3,4,5,6,7,8], including reinforced rubcon bending elements of rectangular cross section [3,4] and T-sections [5], the authors confirmed the possibility of using structures based on this polymer concrete, the type of sensors was established to obtain an adequate picture of the distribution of deformations in the sections of the element. Also, methods have been proposed for using polymer concrete only in the tensile zone to protect steel reinforcement [6] or a polymer casing to protect concrete from aggressive environmental influences and increase the strength of the tensile zone [7,8,9].…”

Deformability of Rubcon and Fibrorubcon Beams

“…The geometric parameters of the beams were assigned based on the analysis of literature sources [4,5,6,8,9,10,11] 60x120mm, where the larger size is the height of the section, the total length of the element is 1.4 m. Based on the analysis of work [11], the deflectometer is set only in the middle of the span.…”

“…The beams were tested for pure bending -the most characteristic type of loading for such elements [9,10,11,12,13,14,15,16], this test scheme also corresponds to the papers devoted to the study of the "work" of rubcon beams under load [4,5,6].…”

“…It was established experimentally that the strength of fibrorubcon corresponds to the class of highstrength concrete, but the modulus of elasticity of rubcon corresponds to the modulus of elasticity of traditional concrete, which can be seen from Table 3. It should be noted that the modulus of elasticity affects the deformability of building elements made of this polymer concrete, which can also be seen in [4,5,6]. The prerequisites for studying fibrorubcon bending structures are presented in [5].…”

The Influence of the Height of Fiber Reinforcement Zone on the Crack Resistance of Rubcon Beams with Mixed Reinforcement

“…without fiber reinforcement, with fiber reinforcement of only the tensile zone and with fiber reinforcement along the entire height of the section. The geometrical parameters of the beams were assigned based on the analysis of literature sources [9][10][11][12][13]. It should be noted that the fiber is located chaotically.…”