Study of mechanical behavior and self-cementing properties of recycled concrete aggregates under repeated loading

• Main Authors: Wang, Chong, Chazallon, Cyrille, Hornych, Pierre, Jing, Peng, Mouhoubi, Saida
• 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, University of Science and Technology Beijing Beijing (USTB), Beijing Unversity of Technology, Hui Yao, Jinxi Zhang, Fwa Tien Fang, Chao Wang
• Format: Conference Object
• Language: English
• Published: CCSD 2023
• Subjects: recycled concrete aggregates; permanent deformation; resilient modulus; self-cementing properties; repeated load triaxial test; unbound granular materials; [SPI]Engineering Sciences [physics]; Orca
• Online Access: https://hal.science/hal-04453296; https://hal.science/hal-04453296v1/document; https://hal.science/hal-04453296v1/file/ICPT-full%20paper-3%20%281%29.pdf

International audience It is known that the strength and stiffness of unbound base and subbase layers prepared with recycled concrete aggregates (RCA) increase over time, known as self-cementing properties of RCA. However, the influence of self-cementing properties on the permanent and resilient deformation behavior has not been thoroughly studied. In this study, the permanent and resilient deformation behavior of two RCA, ORCA and NRCA (old and fresh crushed RCA), after different curing times (1, 180, 360 and 720 days), were investigated by conducting a series of repeated load triaxial tests. The results show that the permanent deformation of NRCA, crushed recently, decreases to a negligible value after curing 180 days, and then reaches a constant value. While the resilient modulus of NRCA increases steadily with curing time till the studied curing time (720 days). Besides, the long-term storage reduces the self-cementing properties of ORCA. As a result, the negligible self-cementing properties have no influence on the permanent and resilient deformation behavior of ORCA.