Non-Destructive Assessment of Structural Health of University Building Using Rebound Hammer

Abstract

The objective of this study is to execute Structural Health Monitoring of University building based on Non Destructive Testing. For this purpose two G+2 RC framed buildings viz. Main-Block and Civil Engineering block of University having age of 24 years and 7 years respectively are considered. For increased life and service of structure is a need of proper monitoring and maintenance. In this study non-destructive testing of lower columns have been done using Rebound Hammer test. 91 columns have been tested in Main Block and 69 columns have been tested in Civil Engineering block. The sizes of rectangular columns in Main Block are 200mm x 700mm and 300mm x 600mm and the size of circular column in Main Block is 250mm diameter. The size of rectangular columns in Civil Engineering block are 300mm x 500mm and 300mm x 700mm. Digital Concrete Rebound Test Hammer is used in the present work. The range of compressive strength values measured on columns of Civil Engineering Block vary from 15 to 40N/mm2 whereas the range of compressive strength values measured on columns of Main Block vary from 20 to 50N/mm2. Average compressive strengths in columns of Main Block of large columns, circular columns and small columns are 35.9N/mm2, 32.2N/mm2 and 31.3N/mm2 respectively. For Civil Engineering Block the average compressive strength in columns of large columns and small columns are 28.7N/mm2 and 27.1N/mm2 respectively. The results of the project can be used as the basis for maintenance and servicing work for improved structural life and operation.