ВПЛИВ КОРОЗИВНОГО СЕРЕДОВИЩА НА ВТОМНУ МІЦНІСТЬ БАЗАЛЬТОВОЇ АРМАТУРИ

Abstract

At the present stage of the construction in dustry development in the reinforced concrete structural elements, along with the traditional steel reinforcement, composite basalt reinforcement is used, which is made from continuous basalt fiber and a polymer matrix. Such a replacement significantly reduces the ircostand leads to significant metals avings. Basalt fibers are obtained from one-component cheap raw materials using singlestage technology. Basalt rocks are used as raw materials for the production of basalt fibers. Basalt reinforcement is characterized by high tensile strength (σВ≈ 1100 МРа), corrosion resistance and low thermal conductivity. However, the properties of basalt reinforcement has not been adequately studied yet. Therefore, the purpose of this work is to determine the fatigue strength of samples made of basalt reinforcement with a nominal diameter of 10 mm considering cyclic stretching and the influence of corrosive medium. To determine the corrosion resistance, one batch of experimental samples was kept in distilled water and the other one in alkaline medium (5% potassium hydroxide solution). Weller curves are built and endurance limits (σN) are seton a given test data base (N). The test data base (N) equals to 2⋅106 cycles. To determine the fatiguest rength of basalt reinforcement experimental studies were carried out in the laboratory at T = 20°C, with the hydraulic certified pulsator EUS-20 at cycle asymmetry R = 0,33 and load frequency f = 10 Hz. According to the results of experimental studies fatigue curves of basalt reinforcement for various corrosive media (are built and the endurance limits (σN) are established. The diagram shows that distilled waters lightly affects the fatigue endurance of basalt reinforcement compared with the strength in air, and an alkaline medium abruptly reduce sitintime.