Early Stage Researcher
Ove-Arup & Partners (Ireland)

Project 2: Reduction of uncertainty in assessing concrete strength of existing structures

Click on the icons for Shah Nur’s email, blog and Linkedin profile

Research Interests:

Structural Concrete; Concrete behaviour

Biography:

After achieving the Bachelor of Science in Civil Engineering at Bangladesh University of Engineering and Technology in 2014, he has been working in the field of structural assessment and retrofitting work of existing building in Bangladesh. Here, concrete property assessment is the most difficult part of the work. In his undergraduate program, he has completed a thesis work on the concrete strength assessment using the recycled coarse aggregate materials. Use of a percentage of recycled coarse aggregate in concrete preparation was found to be okay in the context of Bangladesh. He joined TRUSS ITN in November 2015.

His interest in concrete and its properties led him to work on the reduction of uncertainty of concrete strength assessment of existing building.

Research Outputs:

Publications in TRUSS

With more emphasis on reusing and extending the life of structures, it often becomes necessary to assess the capacity of existing concrete structures. One major component of this assessment relates to the concrete strength. Ideally such assessment is carried out without damaging the concrete of the structure. The currently available methods for assessing in-situ concrete strength as a part of capacity evaluation of the existing structures can be broadly divided into two groups. One group of tests is completely non-destructive. The other group is partially destructive where limited damage to the surface is caused by the tests. For the strength evaluation of existing concrete, methods such as surface hardness test, ultrasonic pulse velocity test, penetration resistance test and maturity test fall under the non-destructive category. Partially destructive tests include pull out test, CAPO test, pull off test and break off test. This paper critically evaluates and analyses the applicability and limitations of the methods used for evaluating concrete strength in existing structures. Most methods for strength evaluation are found to measure a certain property such as elasticity, density, tensile strength or hardness of concrete and then relate the measured value to compressive strength. Studies on these methods show a wide variation in the correlations between estimated and predicted compressive strength. Partially destructive methods are noted to provide correlations with good consistency between estimated and predicted compressive strength.

Link to full text in repository