Horizon 2020 Marie Skłodowska-Curie Innovative Training Network

Md Shah Nur Alam Sourav

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Md Shah Nur Alam Sourav 2017-07-01T21:10:45+00:00
Early Stage Researcher
Ove-Arup & Partners (Ireland)

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

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Research Interests:

Structural Concrete; Concrete behaviour


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

For capacity evaluation, the structural assessment of existing structures is necessary. Concrete strength is an important parameter for such assessment. Non-destructive tests (NDTs) are used along with the traditional approach of core testing for strength assessment of concrete in existing structures. The low reliability of NDT results leads to uncertainty in assessing concrete strength. A new method of non-destructive testing is presented in this paper with the aim of achieving better reliability and reducing uncertainty in the assessment of mortar strength. This approach is based on a modified pullout of post-installed screw anchors. The technique involves a pushin mechanism for a steel screw inside the mortar where a void underneath the screw is left to allow for the uninterrupted movement of the screw inside the concrete. The failure pattern involves local crush-ing of concrete between the threads of the screw. This paper investigates the load bearing behaviour of threaded screws installed in cement mortar under compressive loading. The results supports the application of the tech-nique in the assessment of compressive strength of mortar. The main parameters affecting the pushin behaviour are presented and their effects are discussed. It is planned to extend the test program to concrete in the future.

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