Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Bond and Cracking Behavior of Reinforced Concrete Members Incorporating Recycled Aggregates
Abstract The aim of the present work is to investigate the bond strength and cracking properties of recycled aggregate concretes (RAC). For this purpose, six recycled concrete aggregate mixtures and two conventional concrete mixtures with C25/30 and C35/45 target class of compressive strength and S4 class of workability were chosen. For both series, specimens were fabricated with different incorporation ratios of fine and coarse recycled aggregates and only coarse recycled aggregates. A total of 48 ties were fabricated using 10 mm and 12 mm diameter deformed steel bars embedded in 10 × 10 × 40 cm prisms. In addition to ties specimens, four 20 × 30 × 300 cm reinforced concrete beams were prepared with longitudinal reinforcement of 2HA12. The mechanical properties of the studied concretes were characterized in terms of compressive strength, splitting tensile strength, and Young’s modulus. Concerning reinforced elements, two tests were performed: direct tension for ties and 4 points bending for beams. Recycled aggregate concretes showed more cracks (in number) than natural aggregate concretes. Flexural tests showed, however, that cracks opening remains in the same order of magnitude as in the case of normal concrete, whatever the class of compressive strength (C25/30 or C35/40). These results allowed to conclude that the Eurocode2 (EC2) predictions for the control of cracking remain valid for the studied recycled aggregates based concretes and that it allows an adequate consideration of bond characteristics between rebar and recycled aggregate concretes without questioning significantly the security level which it provides.
Bond and Cracking Behavior of Reinforced Concrete Members Incorporating Recycled Aggregates
Abstract The aim of the present work is to investigate the bond strength and cracking properties of recycled aggregate concretes (RAC). For this purpose, six recycled concrete aggregate mixtures and two conventional concrete mixtures with C25/30 and C35/45 target class of compressive strength and S4 class of workability were chosen. For both series, specimens were fabricated with different incorporation ratios of fine and coarse recycled aggregates and only coarse recycled aggregates. A total of 48 ties were fabricated using 10 mm and 12 mm diameter deformed steel bars embedded in 10 × 10 × 40 cm prisms. In addition to ties specimens, four 20 × 30 × 300 cm reinforced concrete beams were prepared with longitudinal reinforcement of 2HA12. The mechanical properties of the studied concretes were characterized in terms of compressive strength, splitting tensile strength, and Young’s modulus. Concerning reinforced elements, two tests were performed: direct tension for ties and 4 points bending for beams. Recycled aggregate concretes showed more cracks (in number) than natural aggregate concretes. Flexural tests showed, however, that cracks opening remains in the same order of magnitude as in the case of normal concrete, whatever the class of compressive strength (C25/30 or C35/40). These results allowed to conclude that the Eurocode2 (EC2) predictions for the control of cracking remain valid for the studied recycled aggregates based concretes and that it allows an adequate consideration of bond characteristics between rebar and recycled aggregate concretes without questioning significantly the security level which it provides.
Bond and Cracking Behavior of Reinforced Concrete Members Incorporating Recycled Aggregates
Wardeh, George (Autor:in) / Ghorbel, Elhem (Autor:in) / Gomart, Hector (Autor:in) / Fiorio, Bruno (Autor:in)
06.08.2017
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Post-cracking Behaviour of Glass Fibre Reinforced Concrete with Recycled Aggregates
| Springer Verlag | 2020