Recycling of waste materials is actually one of the main targets in civil engineering, because of economic and environmental features. To this aim, the field of road engineering offers many technical solutions, including the use of re-cycled materials from construction and demolition of civil works (C&D) in pave-ment layers. These materials have been investigated to be used as aggregate in as-phalt concrete base layers for flexible road pavements. Different percentages (0%, 15%, 30% e 50%) of C&D materials were used in order to determine the most suitable solution. The scope was to evaluate both static and dynamic mechanical properties of the mixtures. In particular, a servo-hydraulic control static press was used to run indirect tensile tests and a Nottingham Asphalt Tester was used to determine indirect tensile stiffness modulus and fatigue strength. Specimens were manufactured by mixing the aggregate with 5% of bitumen and compacted with a shear gyratory compactor to a fixed height, in order to have a constant air voids content equal to 5%. Experimental results showed that C&D materials can conveniently be used in asphalt concrete for base layers (up to maximum 30%) without penalizing the mechanical performance of the mixture.
Mechanical Behaviour of Asphalt Concrete Containing C&D Recycled Materials
BOCCI, EDOARDO;
2015-01-01
Abstract
Recycling of waste materials is actually one of the main targets in civil engineering, because of economic and environmental features. To this aim, the field of road engineering offers many technical solutions, including the use of re-cycled materials from construction and demolition of civil works (C&D) in pave-ment layers. These materials have been investigated to be used as aggregate in as-phalt concrete base layers for flexible road pavements. Different percentages (0%, 15%, 30% e 50%) of C&D materials were used in order to determine the most suitable solution. The scope was to evaluate both static and dynamic mechanical properties of the mixtures. In particular, a servo-hydraulic control static press was used to run indirect tensile tests and a Nottingham Asphalt Tester was used to determine indirect tensile stiffness modulus and fatigue strength. Specimens were manufactured by mixing the aggregate with 5% of bitumen and compacted with a shear gyratory compactor to a fixed height, in order to have a constant air voids content equal to 5%. Experimental results showed that C&D materials can conveniently be used in asphalt concrete for base layers (up to maximum 30%) without penalizing the mechanical performance of the mixture.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
