Effect of self-cementing properties on the resilient behaviour of recycled concrete aggregates used in base and subbase

• Published in: Road Materials and Pavement Design
• Main Authors: Wang, Chong, Chazallon, Cyrille, Hornych, Pierre, Mouhoubi, Saida, Jing, Peng
• Other Authors: Laboratoire des sciences de l'ingénieur, de l'informatique et de l'imagerie (ICube), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Les Hôpitaux Universitaires de Strasbourg (HUS)-Institut National des Sciences Appliquées - Strasbourg (INSA Strasbourg), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Auscultation, Modélisation, Expérimentation des infrastructures de transport (MAST-LAMES), Université Gustave Eiffel
• Format: Article in Journal/Newspaper
• Language: English
• Published: CCSD 2024
• Subjects: Self-cementing properties; Resilient deformation behaviour; Repeated load triaxial test; Mercury intrusion porosimetry (MIP) test; [SPI]Engineering Sciences [physics]; Orca
• Online Access: https://hal.science/hal-04390324; https://hal.science/hal-04390324v1/document; https://hal.science/hal-04390324v1/file/Chong%202024%20-%20RMPD.pdf; https://doi.org/10.1080/14680629.2024.2302804

International audience Sometimes, an increase of strength and stiffness of unbound pavement base and subbase layers built with recycled concrete aggregates (RCA) can be observed, known as selfcementing properties of RCA. However, the influence of self-cementing properties on the resilient deformation behaviour has not been thoroughly studied. In this research, the selfcementing properties, microstructure and resilient deformation behaviour of two different RCA, NRCA and ORCA, showing significantly different self-cementing properties, after curing for different times (1, 180, 360 and 720 days), were studied by calorimeter tests, mercury intrusion porosimetry (MIP) tests and repeated load triaxial tests (RLTT). The results indicate that the strong self-cementing properties of NRCA improve their microstructure, decreasing the number of macro-pores between particles and the void ratio. As a result, the resilient modulus of NRCA increases continuously, while resilient deviatoric strain and volumetric strain decrease with curing time. After curing for 720 days, the mechanical performance of NRCA is comparable to that of lightly bound materials, which is much better than that of traditional unbound granular materials, showing the advantage of using RCA in unbound pavement layers. On the contrary, for ORCA, showing negligible self-cementing properties, the resilient deformations are most constant.