Title:
Recycled Aggregates Effect on Concrete Mechanical Performance Subjected to High Temperatures
Author(s):
Jessica Beatriz da Silva, Marco Pepe, and Romildo Dias Toledo Filho
Publication:
Symposium Paper
Volume:
326
Issue:
Appears on pages(s):
43.1-43.10
Keywords:
high temperatures, mechanical behavior, recycled aggregate concrete, recycled concrete aggregate, residual strength
DOI:
10.14359/51711025
Date:
8/10/2018
Abstract:
This study presents the results of an experimental campaign aimed at investigating the influence of recycled aggregates, derived from concrete debris (i.e., recycled concrete aggregates, RCAs), on the mechanical performance of the resulting concrete (i.e., Recycled Aggregate Concrete, RAC) after the exposure at elevated temperatures. As a matter of principle, RCAs are, generally, more porous in comparison with natural aggregates, due to the presence of the Attached Mortar (AM) and, this, may affects the physical properties of the aggregates as well as the RAC performance produced with RCAs. For this reason, in order to promote the possible use of RCAs for structural concrete production there is a strong need of understanding the influence of RCAs on the concrete performance, especially when these mixtures are subjected under “extreme conditions”. In this aim, the present experimental campaign investigates the “residual” mechanical performance of both ordinary and high strength concrete class (i.e., C25 and C65) produced with coarse RCAs (up to 100 %) and subjected at elevated temperatures (up to 650°C). The results unveil the role of the AM on affecting the compressive and tensile strengths as well as the elastic modulus of RACs exposed to elevated temperatures.
Related References:
1. Crow, J.M., 2008, “The concrete conundrum”, Chemistry World, 5(3), 62-66.
2. Alexander, M., and Mindess, S., 2010, “Aggregates in concrete”, CRC Press.
3. Dodson, V.H., 2013, “Concrete admixtures”, Springer Science & Business Media.
4. Coppola, L., Kara, P., and Lorenzi, S., 2016. “Concrete manufactured with crushed asphalt as partial replacement of natural aggregates”. Materiales de Construcción, 66(324), 101.
5. Coppola, L., Buoso, A., Coffetti, D., Kara, P., and Lorenzi, S. (2016). “Electric arc furnace granulated slag for sustainable concrete”. Construction and Building Materials, 123, 115-119.
6. Coppola, L., Lorenzi, S., and Buoso, A., 2010. “Electric arc furnace granulated slag as a partial replacement of natural aggregates for concrete production”. In Second International Conference on Sustainable Construction Materials and Technologies.
7. Coppola, L., Lorenzi, S., Marcassoli, P., and Marchese, G., 2007. “Concrete production by using cast iron industry by-products”. Industria Italiana del Cemento, 77(836), 748
8. Pepe, M., Toledo Filho, R.D., Koenders, E.A., and Martinelli, E., 2016, “A novel mix design methodology for recycled aggregate concrete” Construction and Building Materials, 122, 362-372.
9. Amario, M., Rangel, C.S., Pepe, M., and Toledo Filo, R.D., 2017, “Optimization of normal and high strength recycled aggregate concrete mixtures by using packing model”, Cement and Concrete Composites, 84, 83-920.
10. Rangel, C.S., Amario, M., Pepe, M., Yao, Y., Mobasher, B., and Toledo Filho, R.D., 2017, “Tension stiffening approach for interface characterization in recycled aggregate concrete” Cement and Concrete Composites, 82, 176-189.
11. Lotfy, A., and Al-Fayez, M., 2015, “Performance evaluation of structural concrete using controlled quality coarse and fine recycled concrete aggregate”, Cement and Concrete Composites, 61, 36-43.
12. de Brito, J., and Saikia, N., 2012 “Recycled aggregate in concrete: use of industrial, construction and demolition waste” Springer Science & Business Media.
13. Vieira, J.P.B., Correia, J.R., and de Brito, J., 2011. “Post-fire residual mechanical properties of concrete made with recycled concrete coarse aggregates”, Cement and Concrete Composites, 41, 533-541.
14. Laneyrie, C., Beaucour, A.L., Green, M.F., Hebert, R.L., Ledesert, B., and Noumowe, A., 2016, “Influence of recycled coarse aggregates on normal and high-performance concrete subjected to elevated temperatures”, Construction and Building Materials, 111, 368-378.
15. Dong, H., Cao, W., Bian, J., and Zhang, J., 2014, “The fire resistance performance of recycled aggregate concrete columns with different concrete compressive strengths”, Construction and Building Materials, 7(12), 7843-7860.
16. Zega, C.J., and Di Maio, A.A., 2009, “Recycled concrete made with different natural coarse aggregates exposed to high temperature”, Construction and Building Materials, 23(5), 2047-2052.
17. Associação Brasileira de Normas Técnicas. NBR NM 53: Agregado graúdo – Determinação da massa específica, massa específica aparente e absorção de água. Rio de Janeiro, 2009.
18. Associação Brasileira De Normas Técnicas. NBR NM 52: Agregado miúdo - Determinação da massa específica e massa específica aparente. Rio de Janeiro, 2009.
19. Associação Brasileira De Normas Técnicas. NBR NM 30: Determinação da absorção de água em agregados miúdos. Rio de Janeiro, 2001.
20. Associação Brasileira De Normas Técnicas. NBR 5733: Cimento Portland com Alta Resistencia Inicial. Rio de Janeiro, 1991.
21. de Larrard, F., 1999, “Concrete Mixture Proportioning: A Scientific Approach”, Modern Concrete Technology Series, vol. 9, E&FN SPON, London.
22. Koenders, E.A., Pepe, M., and Martinelli, E., 2014, “Compressive strength and hydration processes of concrete with recycled aggregates”, Cement and Concrete Research, 56, 203-212.
23. Associação Brasileira De Normas Técnicas. NBR 5739: Concreto - Ensaio de compressão de corpos-de-prova cilíndricos. Rio de Janeiro, 2007.
24. Associação Brasileira De Normas Técnicas. NBR 8522: Concreto - determinação dos módulos estáticos de elasticidade e de deformação e da curva tensãodeformação. Rio de Janeiro, 2003.
25. Associação Brasileira De Normas Técnicas. NBR 7222: Concreto e argamassa - Determinação da resistência à tração por compressão diametral de corpos-de-prova cilíndricos. Rio de Janeiro, 2011.
26. Liu, Y., Wang, W., Chen, Y.F., Ji, and H., 2016, “Residual stress-strain relationship for thermal insulation concrete with recycled aggregate after high temperature exposure”, Construction and Building Materials, 129, 37-47.
27. Kou, S.C., Poon, C.S., and Etxeberria, M., 2014, “Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures”, Cement and Concrete Composites, 53, 73-82.