Title:
Flexural Behavior of Concrete Mixtures with Waste Tyre Recycled Aggregates
Author(s):
Vincenzo Romanazzi, Marianovella Leone, Francesco Tondolo, Alessandro Pasquale Fantilli, Maria Antonietta Aiello
Publication:
Symposium Paper
Volume:
355
Issue:
Appears on pages(s):
365-374
Keywords:
lightweight concrete; recycled aggregates; rubberized concrete; compressive strength; flexural strength; water permeability; thermal conductivity
DOI:
10.14359/51736044
Date:
7/1/2022
Abstract:
The huge quantity of natural aggregates extracted every year and used in the concrete industry is causing harmful consequences on biodiversity, water turbidity, water table level and landscape, and global warming as well. In this context, many studies focused on the possibility to use waste tyre recycled aggregates as partial replacement for stone aggregates in concrete production. Generally, it has been observed that several mechanical properties, such as compressive strength and modulus of elasticity, significantly decrease when rubber content is increased. On the other hand, rubberized concrete (RuC) showed a more ductile behavior than ordinary Portland cement concrete, in addition to a greater damping and energy dissipation capacity. In this paper, the compressive and flexural strength, water permeability, and thermal conductivity of five concrete mixtures with increasing percentages of rubber particles as a partial replacement for natural aggregates have been investigated. As a result, a reduction in compressive strength has been observed only in RuC mixtures with substitutions greater than 12% of the total aggregates, whereas the flexural strength remained roughly constant. Moreover, the results of water permeability and thermal conductivity tests showed respectively a decrease in water penetration and an improvement of the concrete thermal isolation due to the presence of rubber particles.
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