Image analysis on disintegrated concrete at the post-heating stage
Abstract
The relation between crack growth and reduction in the compressive strength after high temperature exposure and after air re-curing was investigated in this study. Concrete specimens were heated to 1000 ºC and they were subjected to air re-curing for 28 days. During re-curing period, their heated surfaces were monitored by using a digital single-lens reflex camera and the images were analyzed by using image analysis software. After cooling, the maximum reduction in the compressive strength of concrete was 49.5% and that of air re-cured concrete was 66.8%. Image analyses showed high correlations between crack growth and reduction in the compressive strength. This non-destructive method has the potential to represent the extent of damage in concrete after high temperature exposure.
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References
Akca, A. H., Özyurt, N. (2013). High performance concrete under elevated temperatures. Construction and Building Materials. 44:317-328. https://doi.org/10.1016/j.conbuildmat.2013.03.005
Alonso, C., Fernandez, L. (2004). Dehydration and rehydration processes of cement paste exposed to high temperature environments. Journal of Materials Science. 39:3015-3024.
Chang, Y. F. Chen, Y. H., Sheu, M. S., Yao, G. C. (2006). Residual stress-strain relationship for concrete after exposure to high temperatures. Cement and Concrete Research. 36 (10):1999-2005. https://doi.org/10.1016/j.cemconres.2006.05.029
Ingham, J. P. (2009). Application of petrographic examination techniques to the assessment of fire-damaged concrete and masonry structures. Materials Characterization. 60 (7):700-709. https://doi.org/10.1016/j.matchar.2008.11.003
Lin, W. M., Lin, T. D., Powers-Couche, L. J. (1996). Microstructures of Fire-Damaged Concrete. ACI Materials Journal. 93 (3):199-205.
Mendes, A., Sanjayan, J. G., Collins, F. (2011). Effects of slag and cooling method on the progressive deterioration of concrete after exposure to elevated temperatures as in a fire event. Materials and Structures. 44:709-718. https://doi.org/10.1617/s11527-010-9660-2
Poon, C. S., Azhar, S., Anson, M., Wong, Y. L. (2001). Comparison of the strength and durability performance of normal- and high-strength pozzolanic concretes at elevated temperatures. Cement and Concrete Research. 31 (9):1291-1300. https://doi.org/10.1016/S0008-8846(01)00580-4
Yüzer, N., Aköz, F., Dokuzer Öztürk, L. (2004). Compressive strength–color change relation in mortars at high temperature. Cement and Concrete Research. 34 (10):1803-1807. https://doi.org/10.1016/j.cemconres.2004.01.015
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