Experimental Study On Fatigue Of Basalt Fiberreinforced Concrete Beams

Fiber reinforced concrete is in ordinary concrete is uniformly mixed with a certainamount of fiber is obtained after the concrete induration. Fiber can improve theperformance of material from the micro, to enhance the crack resistance effect. Study ofbasalt fiber reinforced concrete at home and abroad have certain progress, much researchon the properties of materials. Study on the concrete component is still relatively small,research on the fatigue properties of the less. Based on the fatigue properties of basalt fiberreinforced concrete beam was studied. To provide experimental data for engineeringapplication of basalt fiber reinforced concrete.Basalt fiber cube through comparison of different volume content of the specimens,effect of basalt fiber on the compressive strength of ordinary concrete. The results showthat: Basalt Fiber on the compressive strength of concrete does not improve, showed atendency to decrease, the maximum intensity reached19.7%. But the incorporation offibers changed the failure mode of concrete, fiber reinforced concrete block in thedestruction of showed good integrity.Through the bending static load test, analysis of basalt fiber reinforced concretebeams under static failure pattern and mechanism under loading. The change law ofload-displacement curves, strain of concrete, reinforcement strain. The results show that:basalt fiber reinforced concrete beam on the ultimate bearing capacity is enhanced, themaximum amplitude is6.5%.Through the constant amplitude fatigue test, study of basalt fiber reinforced concretebeams under repeated load failure pattern and mechanism. Analysis of displacement, strainof concrete, steel strain with the influence of fatigue cycle number. The results show that:Basalt Fiber fatigue failure modes of reinforced concrete beam to the brittle fracture, werestarted in fatigue fracture of reinforcement. Displacement, strain, strain of steel bar aredisplayed along with the number of fatigue cycles in early growth drastically, nextamplitude changes relatively small, in the stable stage. Finally, based on the materialmechanics calculation formula of basalt fiber reinforced concrete beams under cyclic loadstiffness, through the S-N curve fitting of basalt fiber reinforced concrete beams with different volume fraction of fatigue life equation.