Behavior of Concrete Beam Strengthened with UHPC
Syifa Nadia Iskandar (a), Mardiana Oesman (a*)

(a) Department of Civil Engineering, Applied Master of Infrastructure Engineering, Polytechnic State of Bandung
JL. Gegerkalong Hilir, Bandung Barat 40559, Indonesia
*mardianaoesman[at]polban.ac.id

Abstract

According to the Minister of PUPR, at least 40% of bridges in Indonesia are in poor condition. Ultra High Performance Concrete (UHPC) is one alternative material that can be used as reinforcement for concrete structural elements. The behavior of a concrete beam strengthened with UHPC layer in the tensile area was investigated experimentally. Next, the behavior of a concrete beam strengthened with UHPC will be compared with a concrete beam strengthened with normal concrete with the same thickness of 50 mm. The behavior of concrete beams is analyzed for stiffness, toughness, ductility and cracking mode. The results of the study indicate that the concrete beam strengthened with UHPC can increase the maximum load, ultimate load, yield load, and greater deflection so that they have greater ductility. Strengthened concrete beam with UHPC can increase the toughness by 32.9%, the stiffness by 13.5%, the ductility by 85%. In the B-UHPC 50 composite beam, the cracking mode was caused by flexural cracking- whereas, in the B-NC 50 composite beam the cracking mode was caused by flexural shear cracking.

Keywords: UHPC, compressive strength, local materials, retrofit, beam

Topic: Materials Science