Synthesis of Available Methods for Repair of Reinforced Concrete and Prestressed Concrete Girders

July 31, 2020 1:00 pm

In this quarterly Research Seminar, Mohamed Moustafa, Ph.D., P.E., Principal Investigator; and Azin Ghaffary, Ph.D. Student, present work under the ABC-UTC research project entitled Synthesis of Available Methods for Repair of Reinforced Concrete and Prestressed Concrete Girders conducted at the University of Nevada, Reno.

Research Seminar Documents:
Synthesis of Available Methods for Repair of Reinforced Concrete and Prestressed Concrete Girders - pdf of presentation
Q&A Session - pdf

Description: According to the ASCE 2017 Infrastructure Report Card, almost 40 percent of the nation’s transportation infrastructure is over 50 years old. Approximately 23 percent of more than 614,000 bridges in the United States are classified as either structurally deficient or functionally obsolete. Accordingly, the available options are “leave and monitor”, “repair”, or “replacement” of the girders. Due to the shortcomings of the latter option including higher cost and time consumption (average girder replacement costs $8000 per ft of girder and takes one to two months to complete), repair of the bridge girders has become an important topic. The objective of this study was to gather the information about different materials and methods for repair of bridge girders and end zones. The focus was on the repair of reinforced concrete and prestressed concrete bridge girders as more than 60 percent of the bridge inventory in the US are made of concrete. The outcome is meant to enable researchers, engineers, and decision makers to compare the available repair methods more conveniently to find the optimal repair approach for specific projects.

Presenters:

 

Mohamed Moustafa, Ph.D., P.E.
Assistant Professor
Department of Civil Engineering and Environmental Engineering
University of Nevada, Reno

 

Azin Ghaffary, Ph.D. Student
(Ph.D., December 2020)
Department of Civil Engineering and Environmental Engineering
University of Nevada, Reno

Presentation Graphics:

Figure 1. Recommended repair procedure for reinforced concrete and prestressed concrete bridge girders with shear cracks

Figure 2. Frequency of use of flexural repair techniques of damaged reinforced concrete and prestressed concrete girders in the literature

Figure 3. Recommended repair procedure for reinforced concrete and prestressed concrete bridge girders with impact or flexure damage