<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Quality of concrete is mainly measured by evaluating its strength. Destructive testing of concrete specimens is used for the purpose. An alternative to it is the non-destructive testing. This research work presents non-destructive testing of concrete cylinders made by using partial replacement of natural coarse aggregates with old concrete as coarse aggregates and exposed to 6-hour fire at 1000ºC. Rebound hammer is used in this work to evaluate concrete strength. 240 concrete cylinders are cast using 1:2:4 mix and 0.54 water cement ratio. After 28-days curing half of the cylinders are exposed to fire in purpose made oven. Remaining 50% aggregates are used as control specimen to compare the results. After rebound hammer testing, all the cylinders are tested for compressive strength using universal testing machine. Comparison of the results shows the reliability of non-destructive testing and effectiveness of the rebound hammer technique as the difference between NDT and UTM results is maximum up to 4.7%.</p>
</abstract>

Quality of concrete is mainly measured by evaluating its strength. Destructive testing of concrete specimens is used for the purpose. An alternative to it is the non-destructive testing. This research work presents non-destructive testing of concrete cylinders made by using partial replacement of natural coarse aggregates with old concrete as coarse aggregates and exposed to 6-hour fire at 1000ºC. Rebound hammer is used in this work to evaluate concrete strength. 240 concrete cylinders are cast using 1:2:4 mix and 0.54 water cement ratio. After 28-days curing half of the cylinders are exposed to fire in purpose made oven. Remaining 50% aggregates are used as control specimen to compare the results. After rebound hammer testing, all the cylinders are tested for compressive strength using universal testing machine. Comparison of the results shows the reliability of non-destructive testing and effectiveness of the rebound hammer technique as the difference between NDT and UTM results is maximum up to 4.7%.

Strength (Compressive) of Concrete Made by Recyclable Concrete Aggregates after Six Hour Fire by Nondestructive Testing

Department of Civil Engineering, Kulliyyah (Faculty) of Engineering

International Islamic University Malaysia

Quaid-e-Awam University of Engineering, Science and Technology

Shaheed Benazir Bhutto University Shaheed Benazir Abad

Journal of Applied Engineering Sciences

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Quality of concrete is mainly measured by evaluating its strength. Destructive testing of concrete specimens is used for the purpose. An alternative to it is...

Strength (Compressive) of Concrete Made by Recyclable Concrete Aggregates after Six Hour Fire by Nondestructive Testing

Published Online: May 14, 2023

Page range: 57 - 64

Received: Feb 08, 2023

Accepted: Feb 15, 2023

DOI: https://doi.org/10.2478/jaes-2023-0008

Keywords
Old concrete, Coarse aggregates, Fire resistance, Compressive strength, Residual strength, Recyclable aggregates, Non-destructive Testing

© 2023 A.H. Buller et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Strength (Compressive) of Concrete Made by Recyclable Concrete Aggregates after Six Hour Fire by Nondestructive Testing

Published Online: May 14, 2023

Page range: 57 - 64

Received: Feb 08, 2023

Accepted: Feb 15, 2023

DOI: https://doi.org/10.2478/jaes-2023-0008

KeywordsOld concrete, Coarse aggregates, Fire resistance, Compressive strength, Residual strength, Recyclable aggregates, Non-destructive Testing

© 2023 A.H. Buller et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Old concrete, Coarse aggregates, Fire resistance, Compressive strength, Residual strength, Recyclable aggregates, Non-destructive Testing