jzs-10631

Destructive and Non Destructive Strength Evaluation of Concrete Exposed to Fire

Mohamad R. Abdulkadir1, Atta A. Karim1 and Avin H. Abdullah1

1Departement of Civil Engineerng, Faculty of Engineering, University of Sulaimani, Kurdistan Region, Iraq

Doi Link/ https://doi.org/10.17656/jzs.10631

Original: 8 April 2016, Revised: 20 October 2016,  Accepted: 19 July 2017,  Published online: 20 September 2017

Abstarct

In this investigation concrete of different compressive strength is exposed to fire for various duration similar to natural fire occurring in buildings. A total of 72 Concrete cubes have been cast from three different concrete mixes then exposed to fire up to 10000C for three different durations (15,30 and 60 minutes) then tested using non- destructive methods like hammer rebound test and Ultra-Sonic Pulse velocity test. Then  the cubes were tested to destruction to measure their compressive strength. The results have shown that the unit weight, compressive strength and actual residual strength decreases with the increase of firing exposure duration similar to concrete exposed to steadily rising temperature. The correlation between the cube compressive strength and RN of the hammer test is very close, however the correlation coefficient of the cube strength with the UPV results is less. Using the combined method of the NDT, the relation between the cube strength and the NDT improves. Equations of relation between

compressive strength and NDT tests are proposed for use in practice.

Keywords: Destructive, Nondestructive tests[NDT], Concrete, Compressive Strength, Firing

References:

[1] Liu, J. Mou-Lin, S., and Chang-Huan,K. "Estimating the Strength of Concrete Using Surface Rebound Value and Design Parameters of Concrete Material",Tamkang Journal of Science and Engineering Vol. 12, No.1, pp.1-7. (2009).

[2] Szilagyi, K.Borosnyoi, A. and Zsigovics, I."Rebound Surface Hardness of Concrete: Introduction of an Empirical Constitutive Model",Construction and Building Materials Vol. 25, No. 5, pp. 2480-87. (2011).

[3] Hamidian, M. Shariati, A. Khanouki, A. Sinaei, H. Toghroli, A. and Nouri, K. "Application of Schmidt Rebound Hammer and Ultrasonic Pulse Velocity technique for structural Health Monitoring" ,Scientific Research and Essays Vol.7, No.21. ( 2012).

[4] Youkhanna, D. "Strength Estimation of Concrete Produced in Kurdistan Region Using Non-destructive Tests (Combined Method)",Sallahadin University, MSc thesis. (2012).

[5] Breysse, D."Nondestructive Evaluation of Concrete Strength: an Historical Review and a New Perspective by Combining NDT Methods" ,Construction and Building Materials Vol. 33, pp.139-163. (2012).

[6] Pucinotti, R. "Reinforced Concrete Structure: Nondestructive In-situ Strength Assessment of Concrete", Construction and Building Materials Vol. 75, pp.331-341. (2015).

[7] Abdullah, B. Abdulkadir, M.R "Correlation Between Destructive and Non-destructive Tests Results for Concrete Compressive Strength", Journal of Zankoy Slimani, Part A. (2016). (accepted for publication).

[8] Di Maio, A. Giaccio, G. and Zerbino R. “ Non-Destructive Tests for the Evaluation of Concrete Exposed to High Temperature” ,Cement, Concrete, and Aggregates, CCAGDP, Vol.24, No. 2. (2002).

[9] Brozovsky J. Bodnarova, L. Hela R. Drochytka R. and Hela V. "Evaluation of Degradation of concrete exposed to high temperature by means of Ultrasonic pulse method", Applied mechanics and materials. Vols. 284-287 pp.1325-1329. (2013).

[10] Kirchhof, L. Lorenzi, A. Silvafilho P, "Assessment of Concrete Residual Strength at High Temperatures using Ultrasonic Pulse Velocity", The e-journal of Nondestructive Testing- Vol. 20 No. 7 July (2015).

[11] Umran, M.,"Fire Flame Exposure Effect on Some Mechanical Properties of Concrete”MSc Thesis College of Engineering, Department of Civil Engineering, Babylon University,Babylon, Iraq. October (2002).

[12] Kadhum, M.,"Effect of Fire FlameExposure on the Compressive Strength of Fibre Reinforced Concrete" Engineering Sciences, Babylon University Journal, Vol. 11, No. 5, (2006)

[13] Yaqub, M."Comparison of Non Destructive Tests Results for Fire Affected and Unaffected Concrete Structure", 30th Conference on our world in concrete & structures. Singapore. 23 – 24. August (2005).

[14] Li, Y. and Franssen, J. "Test results and Model for the Residual Compressive strength of Concrete after a Fire"“ , Journal of Structural Fire Engineering. Vol. 2 , No. 1. March (2011).

[15] BSI,"Recommendation for Surface HardnessTesting by Rebound hammer" londom, BS1881,part 202. (1986).

[16] ASTM C597,"Standard Test Method forPulse Velocity Concrete".Annual Book of ASTM Standards, Vol. 04, October (2009).

[17] ASTM C136,"Standard Test Method forSieve Analysisof Fine and Coarse Aggregates". Annual Book of ASTM Standards, Vol. 04, October (2014).

[18] Eurocode 1: Actions on Structures – Part 1-2 "General Actions on Structures Exposed to Fire". Brussels, European Committee for Standardisation, (2002).

[19] Chew, Michael, and Lin."Residual Compressive Strength of Heated Concrete". Architectural Science Review Vol.36, No.2, pp.49-52. (1993).

[20] Mohamedbhai, G. " Effect of Exposure Times and Rate of Heating and Cooling on Residual Strength of heated Concreate." Magazine of Concrete Research Vol.38, No.136, pp.151-58. (1986).

[21] Naus D. "A Compilation of Elevated Temperature Concrete Material Property Data and Information for Use in Assessments of Nuclear Power Plant Reinforced Concrete Structures" United States Nuclear Regulatory Commission. USA. December (2010).

[22] Peng, G., Bian, S., Guo, Z., Zhao,J., Peng, X., and Jiang, Y."Effect of Thermal Shock Due to Rapid Cooling on Residual Mechanical Properties of Fiber Concrete Exposed to High Temperature". Construction and Building Materials, No. 22, pp.948-55, (2008).

View Full Text