Abstract:
This research paper presents a new approach to develop a simple bridge rating system for Sri
Lanka. This approach evaluates the current performance of concrete bridges on the basis of
simple visual inspection and non-destructive tests. The main reason to conduct this research is
to develop a proper bridge management system for Sri Lanka and to develop deterioration
prediction curve for bridges. Also some applicable maintenance techniques are introduced
according to identify condition state of the bridge based on the durability performance of the
each bridge. During field inspection the major issue, to deteriorate concrete bridges was
identified as chloride induced corrosion called chloride attack. To understand bearing capacity
reduction and area reduction of reinforcing steel due to corrosion, Accelerated Corrosion
Testing Method (ACTM) was carried out at the laboratory. By conducting loading test the
bearing capacity reduction of deteriorated concrete beam was compared with control beam.
More than fifty percentage of area reduction in steel bars was observed while it caused to
reduce flexural capacity reduction more than seventy percentages, compared to control beam.
