The use of waste materials to obtain new products with significant potential to replace conventional materials in road construction has two big advantages: protecting the environment and conserving natural resources. Blast furnace slag is the most important by-product of the steel industry, through the available quantity, through existing and potential reuse fields.
Also, over time researchers demonstrated that asphalt mixtures prepared with polymer modified bitumen make their performance improved and increase the lifetime of the road. A considerable source of polymer for the modification of road bitumen are the used tires and by recycling them, it is obtained the crumb rubber.
The main purpose of this study is to evaluate the behaviour of two asphalt mixture recipes: one for binder course (AC22.4) and one for base course (AC25) with blast furnace slag and crumb rubber in different percentages. The laboratory tests were performed according European norms, in the Roads Laboratory of Centre for Road Technical Studies and Informatics.
For the sample preparation, the crumb rubber was added directly in the bitumen (wet procedure) and natural aggregates were successfully replaced by blast furnace slag. In this paper, results and analyses from laboratory tests are presented, by comparing the initial recipes, without waste materials, with the ecological recipes.

asphalt mixture, blast furnace slag, crumb rubber