Experimental Study On Basalt Fiber Composite Materialsand Strengthened Reinforced Concrede Beams

Basalt fiber is made from natural basalt ore. After basalt rock is broken andmelted in the furnace at 1450~1500℃, continuous fibers are made through aplatinum-rhodium alloy plate. It is a new type of fiber products with independentintellectual property rights of China. By taking basalt fiber as reinforcement, variouscomposite materials can be made. In the field of civil engineering, compared withthe commonly used carbon fiber and aramid fiber, basalt fiber not only has higherstrength and elastic, but also has outstanding performance in temperature resistance,anti-oxidation, anti-acid, anti-radiation, noise insulation, which can be used invarious environments. Besides, basalt fiber is cost-effective and is a naturalinorganic non-metallic material. It can play an important role in the field of nationaldefense, traffic and transportation, building construction, petrochemical engineering,environmental protection, electronics, and aeronautics and astronautics. Since thedevelopment of basalt fiber is relatively short and the performance is not stable, therelevant study in civil engineering is insufficient and more experience is still needed.Therefore, some experimental studies were conducted in this thesis on application ofbasalt fiber.The experiment on fundamental mechanical properties of sheets, bars, andplates made with basalt and epoxy resin. Based on the experimental data, variousfactors that affect their mechanical properties were discussed and the fundamentalmechanical properties of basalt materials were recognized. It was shown that basaltfiber composite materials have good mechanical properties and can satisfyengineering requirements.The bending and shear resistance experiment was conducted on reinforcedconcrete beams strengthened with basalt fiber sheets. The load-displacementrelationship, the stains in steel bars and basalt fiber sheets, the distribution and propagation of cracks, and the failure modes were analyzed and compared withtheoretical predictions. It was shown that it is effective to strengthen concrete beamswith basalt fiber composite materials.