Bond Behavior of Recycled Concrete: Analysis and Prediction of Bond Stress–Slip Curve
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
This paper studies the bond stress–slip curve of recycled concretes and the influence of recycled coarse aggregate, which leads to the determination of bond behavior at serviceability. In order to perform this analysis, a study of the compressive strength of the recycled aggregate concretes is required, due to the relationship between the bond strength and the mean compressive strength. Two series of concretes are designed with different water to cement ratios (0.50 and 0.65) and four different replacement percentages (0, 20, 50, and 100%). The experimental program tests cubic specimens through 144 compressive strength tests and 160 pull-out tests at different ages, from 3 to 365 days. The results show that replacement ratio significantly influences concrete properties related to the compressive strength and bond behavior. Two functions are developed to predict time-dependent compressive strength and bond stress–slip curve of recycled concrete, both based on the International Federation for Structural Concrete Model Code expressions for conventional concrete.
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Acknowledgments
The study was funded by the “Clean, efficient and nice construction along its life cycle (CLEAM)” project funded by the Centre for the Technology and Industrial Development (CDTI) and led by the Economic Interest Group CLEAM-CENIT, AIE, composed of the country’s largest construction companies (Acciona, Dragados, Ferrovial, FCC, Isolux Corsán, OHL and Sacyr) and PYME (Informática 68, Quilosa and Martínez Segovia y asociados); and by “HORREO: Robust self-compacting recycled concretes: rheology in fresh state and mechanical properties (BIA2014-58063-R),” funded by the Ministry of Economy and Competitiveness.
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©2017 American Society of Civil Engineers.
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Received: Apr 27, 2016
Accepted: Mar 8, 2017
Published online: Jun 15, 2017
Published in print: Oct 1, 2017
Discussion open until: Nov 15, 2017
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