Paper Title
Mechanical and Elastic Properties of Concretes Made with Recycled Asphalt Pavement
Abstract
The present study investigates in mechanical and elastic properties of concretes made with recycled asphalt
pavement (RAP), without any pretreatment. For that purpose five families of concrete were designed with different
substitution contents with a maximum of 50% RAP, at three water cement (W/C) ratios (0,50-0,60 and 0,70). During mixture
procedure, the “two steps mixing approach” (TSMA) was applied. Controlled slump is 90-150 mm. Compressive tests and
modulus of elasticity tests were conducted on hardened specimens at 28 days. Experimental results showed that the more
RAP content increases in mix, the more mechanical and elastic characteristics decrease. It is the same when W/C ratio
increases. Then, a good correlation between static modulus of elasticity and compressive strength is obtained. Finally,
mathematical modeling using factorial design 2 2 is established in aim to quantify the effect of RAP and W/C ratio on
response in terms of compressive strength and modulus of elasticity. Established models can predict both properties for
hardened concrete, whatever the RAP content and whatever W/C ratio.
Index terms - Environment, sustainable materials, concrete, recycled asphalt pavement concrete, recycling, valorization,
compressive strength, static modulus of elasticity, factorial design, modeling.