Title:
Influence of Quality of Recycled Concrete Aggregates Paste on the Internal Cure Phenomenon
Author(s):
Thibaut Marchi, Marie Salgues, Eric Garcia Diaz, Jean Claude Souche, and Philippe Devillers
Publication:
Symposium Paper
Volume:
349
Issue:
Appears on pages(s):
742-751
Keywords:
Recycling, durability, interfacial transition zone, internal curing, High Performance Concrete
DOI:
10.14359/51732785
Date:
4/22/2021
Abstract:
Recent studies focused on the quality of the interfacial transition zone (ITZ) of ordinary concretes made from recycled aggregates (RA), without however focusing on High Performance Concretes (HPC).
This paper aims to formulate HPC from RA that are exclusively derived from concrete, whose composition is controlled. These concretes are made in a ready-mixed concrete plant and then undergo a crushing and riddling process to produce RA. Partially saturated gravels are substituted up to 100% in the HPC composition in order to accentuate internal cure phenomenon. This phenomenon was observed and demonstrated using a scanning electron microscope (SEM) in the low Water/Cement (W/C) paste up to a distance of 150 μm from the RA and compared by image processing, to a reference concrete made from natural aggregates (NA).
The comparison of the mechanical performances and the microscopic analysis of HPC show that the characteristics transfer of the RA seem to favor a hydration of the paste by a mechanism of desorption of their absorbed water, in a process of “internal cure”. The internal cure appears optimal for concrete C60. In addition to this observation, there was an increase in the strength of the recycled HPCs compared to control natural-aggregate HPCs.
Related References:
1. Cudeville, A. (2011). Recycler le béton. Pour-La-Science, 408, 17–18.
2. Pedro, D., De Brito, J., & Evangelista, L. (2017). Structural concrete with simultaneous incorporation of fine and coarse recycled concrete aggregates: Mechanical, durability and long-term properties. doi: 10.1016/j.conbuildmat.2017.07.215
3. Silva, R. V., de Brito, J., & Dhir, R. K. (2017). Availability and processing of recycled aggregates within the construction and demolition supply chain: A review. Journal of Cleaner Production, 143, 598–614. doi: 10.1016/J.JCLEPRO.2016.12.070
4. Akbarnezhad, A., Ong, K. C. G., Tam, C. T., & Zhang, M. H. (2013). Effects of the Source Concrete Properties and Crushing Procedure on the Properties of Coarse Recycled Concrete Aggregates, (December), 1795–1802. doi: 10.1061/(ASCE)MT.1943-5533.0000789
5. José M.VGómez-Soberón (2002). Porosity of recycled concrete with substitution of recycled concrete aggregate: An experimental study. doi: 10.1016/S0008-8846(02)00795-0
6. Mefteh, H, Kebaïli, O, Oucief, H, Berredjem, L, Arabi, N. 2013. Influence of moisture conditioning of recycled aggregates on the properties of fresh and hardened concrete. J.Clean. Prod. 54: 282–288.
7. Poon, CS, Shui, ZH, Lam, L, Fok, H, Kou, SC. 2004. Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of concrete. Cem. Concr. Res. 34: 31–36.
8. Hanaa Khaleel AlwanAl-BayatiPrabir KumarDasSusan L.TigheHassanBaaj. (2016). Evaluation of various treatment methods for enhancing the physical and morphological properties of coarse recycled concrete aggregate. doi: 10.1016/j.conbuildmat.2016.02.176
9. Vivian W.Y.TamaC.M.TambY.Wangc (2007). Optimization on proportion for recycled aggregate in concrete using two-stage mixing approach. doi: 10.1016/j.conbuildmat.2006.05.040
10.LE, T. (2015). Absorption of recycled aggregates. PhD thesis. Ecole des Mines d’Alès - Ecole des Mines de Douai.
11. Zhu, W., Howind, T., Matías, A., & S, M. I. (2017). Properties of interfacial transition zones ( ITZs ) in concrete containing recycled mixed aggregate, 81. doi: 10.1016/j.cemconcomp.2017.04.011
12. Djerbi, A. (2018). Effect of recycled coarse aggregate on the new interfacial transition zone concrete Old paste Natural aggregate. Construction and Building Materials, 190, 1023–1033. doi: 10.1016/j.conbuildmat.2018.09.180
13. Poon, C. S., Shui, Z. H., & Lam, L. (2004). Effect of microstructure of ITZ on compressive strength of concrete prepared with recycled aggregates, 18, 461–468.
doi: 10.1016/j.conbuildmat.2004.03.005
14. Ollivier, J.-P., & Torrenti, J.-M. (2008). The porous structure of concrete and the transfer properties. The durability of concrete. ENPC.
15. Dao, 2012. Dao D.T., (Multi-) Concrete Recycling, PhD thesis, Ecole Centrale de Nantes, 2012.
16.Dao et al., 2014. Dao D-T, Sedran T., de Larrard F., Optimization of the recycling of concrete in concrete: application to an airport slab, 12th international symposium on concrete road, Prague, Czech Republic, 23-26, 2014.
17. Larrard, 1999. De Larrard F., Concrete Mixture-Proportioning: a scientific approach, Modern Concrete Technology, series No. 9, A. Bentur and S. Mindness editors, E & FN SPON, ISBN 0-419-23500-0, 1999.
18. E. Garcia-Diaz, A. Djerbi, G. Le Saout (2018), Microstructure of recycled concrete, Concrete Recycling, Research and Practice, Edited ByFrancois de Larrard, Horacio Colina
19. Tan Li, Jianzhuang Xiao,Cimian Zhu (2016), Hydration process modeling of ITZ between new and old cement paste. Construction and Building Materials, doi: 10.1016/j.conbuildmat.2016.01.053
20. Nguyen, T. D., Le Saoût, G., Devillers, P., & Garcia-diaz, É. (2014). The effect of limestone aggregate porosity and saturation degree on the interfacial zone.
21. Marchi.T, Devillers P., Souche J-C, Salgues.M, Garcia-Diaz.E, Influence of source concrete on the quality of recycled aggregates, University, L. (2018). International Francophone Conference NoMaD 2018 Liège University, 1–12. https://popups.uliege.be/nomad2018/index.php?id=243&file=1
22. Akbarnezhad, A., Ong, K. C. G., Tam, C. T., & Zhang, M. H. (2013). Effects of the Source Concrete Properties and Crushing Procedure on the Properties of Coarse Recycled Concrete Aggregates, (December), 1795–1802. doi: 10.1061/(ASCE)MT.1943-5533.0000789
23. Thang Le, Gwenn Le Saout, Eric Garcia-Diaz, Damien Betrancourt, SébastienRémond. (2017) Hardened behavior of mortar based on recycled aggregate: Influence of saturation state at macro- and microscopic scale. doi: 10.1016/j.conbuildmat.2017.02.035
24. K. L. Scrivener, A. Bentur, P. L. Pratt. (1988) Quantitative characterization of the transition zone in high strength concretes. doi: 10.1680/adcr.1988.1.4.230