Effect of composition on the properties of concrete made with RAP aggregate

Replacing natural aggregate with recycled materials can decrease the environmental impact of concrete by reducing not only the use of natural resources, but also the disposal of waste materials. Recycled asphalt pavement (RAP) is a granular material obtained from the maintenance of road pavements whose size and distribution make it suitable as aggregate for concrete. This note presents the results of an experimental research aimed at characterising properties of concretes made with RAP as replacement of natural aggregate (in fractions ranging from 0 to 100%), considering the effect of compositional parameters such as the cement type (a limestone portland cement, CEM II A-LL 42.5R, and a pozzolanic cement, CEM IV/A (P-V) 42.5N-SR) and the water/cement ratio (0.45 and 0.65). Besides basic characterisation at fresh and hardened state, also durability properties were measured, such as resistance to carbonation, sorptivity, water absorption and electrical resistivity.