Comparative Study of PSC Spun Pole using Higher Grade Concrete without and with Discontinuous Glass Fiber

Abstract

This experimental study was carried out on the prestressed concrete spun pole of length 13 m with and without use of anti-crack discontinuous glass fiber in high-strength concrete. The pole is having outer diameter at top and bottom as 206 mm and 379 mm respectively. The pole is having thickness 50~55 mm. The investigations were done to study the effect of use of high dispersion discontinuous glass fiber on deflection of spun pole when design load of 350 kg is applied to it. The investigations were also done to study final recovery of deflection after removal of the load. The horizontal load is applied and increased in specific fractions up to design load and corresponding deflections of the pole is measured. Simultaneously, the pole is observed for the appearance of the cracks on the surface area. Final recovery of the deflection is noted after removal of the design load. The same procedure was repeated by increasing the load beyond the designed load. All the above parameters (deflection, crack pattern, recovery) were observed. Considerable improvement in the properties of PSC spun poles was observed during practical investigations.
Keywords: PSC, GFRC, deflection, cracks, recovery