Abstract
The aim of this study is to investigate the cause of the self-cementing properties of recycled aggregates used for pavement base. Clay bricks were added to the recycled aggregates to study the pozzolanic reactions. The evolution of the mechanical performances of the materials was investigated in the laboratory (California Bearing Ratio) and in the field (plate test). Both tests showed that initially, the mechanical performances of recycled aggregates are equivalent or even lower than those of natural aggregates. However, recycled aggregates become much better than natural aggregates with time. Therefore, setting tests, microcalorimetric analysis, and two pozzolanicity tests (pH evolution and consumption of ions) were carried out in a laboratory in order to explain the observations made on the test beds. The microcalorimetric analysis showed that there is only a slight hydraulicity due to residual anhydrous cement content in recycled aggregates. However, the other tests highlight that the presence of clay bricks particles in recycled aggregates results in pozzolanic reactions that can explain the time-evolution of mechanical performances. This study suggests that recycled aggregates have a high added value when they are used as pavement base.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. In fact, this research was within the framework of the RECYMENT project and the report is available in French.
Acknowledgments
This research was carried out as a part of the RECYMENT project (contract number: 13 06 C0085), cofinanced by LaSIE and ADEME (French agency for the ecological transition). The authors would like to acknowledge Mr. Laurent CHATEAU (ADEME), Mr. Valery FERBER (Charier Company), Ms. Mariane AUDO (post-doc at the LaSIE), Mr. Flavien GABILLY and Mr. Mathieu MOREAU (trainees).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 6 • June 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 11, 2020
Accepted: Sep 8, 2020
Published online: Mar 31, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 31, 2021
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