Date Approved

9-28-2022

Embargo Period

10-2-2024

Document Type

Dissertation

Degree Name

Ph.D. Doctor of Philosophy

Department

Civil and Environmental Engineering

College

Henry M. Rowan College of Engineering

Advisor

Gilson Lomboy, D.Eng., Ph.D.

Committee Member 1

Ralph Dusseau, Ph.D., Professor

Committee Member 2

Douglas Cleary, Ph.D.

Committee Member 3

William Riddell, Ph.D.

Committee Member 4

Tirupathi R. Chandrupatla, Ph.D.

Subject(s)

Concrete--Research; Concrete beams--Corrosion; Bridges--Retrofitting

Disciplines

Civil Engineering

Abstract

This research describes a study on the stiffness degradation of reinforced concrete beams due to corrosion of reinforcement and the effect of subsequent retrofitting. A total of eleven beams were tested under cyclic loading history, where the amplitude on subsequent cycles is increased until the beam fails. The two corroded-repaired beams were repaired with a non-proprietary UHPC applied to the tension and compression surfaces, respectively. The results indicated substantial stiffness degradation of the corroded beam that was not retrofitted. The control beam passed the ACI 437 acceptance criteria (Ipr = 0.22, IR = 100.1, IDL = -0.036). The corroded beam exhibited unacceptable behavior (Ipr = 0.54 > 0.50, and IR = 106.57, greater than 105%) with acceptable deviation from linearity (IDL = 0.16 < 0.25). UHPC retrofitted beams with corrosion of 5.5% to 8.5% showed a significant increase in stiffness by about 23% and 53% for compression retrofitted and tension retrofitted, respectively, compared to the corroded beam. Both corroded-retrofitted beams produced acceptable performance measures for permanency ratio, repeatability index, and deviation of linearity index. For both repaired beams, the deviation of linearity indices (IDL = -0.042 and IDL = -0.196, < 0.25) were also under the limits. The study showed the employed retrofitting strategy was effective in stiffening concrete structures damaged by corrosion to reinforcement.

Download

Share

COinS