Image analysis on disintegrated concrete at the post-heating stage
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.
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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