Abstract
In the current study the moment - curvature behavior of basalt fibred concrete beams made with basalt fibre reinforced polymer bars and normal beams with steel rebars are evaluated. Basalt fibred reinforced concrete beams of M30 grade were casted with steel and BFRP rebars separately to study the flexural properties of basalt fibre and BFRP bars. From the load –deflection plots, flexural characteristics such as load at first crack, ultimate flexural strength, deflection at the centre and crack width at failure are evaluated. Deflections were measured at the central point and under the load using the deflection meters. The values of moments and curvatures are obtained. Moment curvature relationships are very important to assess out ductility of the structure and the amount of possible redistribution of stresses. The deformations measured are divided by the gauge length (200mm) to obtain the strains at the particular level. From the top and bottom strains, the average curvatures were calculated. From these results, M-Ф diagrams are plotted.
Highlights
High temperature resistance, chemical stability, corrosion resistance, thermal conductivity, and insulation are all advantages of basalt fibre
Visible flexural fractures occurred at 70 percent to 80 percent of the ultimate load of each beam in conventional concrete beams built with steel rebars, and at 75 percent to 85 percent of the ultimate load of each beam in beams made with basalt fibre reinforced polymer (BFRP) rebars
Deflections at service loads are less than the maximum allowed deflection of 4.8 mm, i.e. Span/250, prescribed by IS 456-2000 in basalt fibred M30 grade reinforced concrete beams constructed with steel and basalt fibre reinforced polymer (BFRP) rebars
Summary
Chemical stability, corrosion resistance, thermal conductivity, and insulation are all advantages of basalt fibre. The use of fibre reinforced polymer tendons (FRP bars) as a replacement for steel bars is a viable option. This approach may be used to tackle the problem of concrete durability caused by steel bar corrosion, as well as satisfy the needs of specific constructions that require electromagnetic interference protection. FRP bars, on the other hand, have strong tensile strength, low elastic modulus, and linear deformation properties.
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