Granulats recycles de substitution pour bétons hydrauliques

Abstract

The building materials industry is always accompanied by secondary products or waste that have an impact on the environment. In Western countries the rejection of solid waste from factories building materials and demolition of buildings in Discharges is strictly prohibited. The management of solid waste is a major environmental concern in the world. With the rarity of discharge space, the use of waste has become an attractive alternative to disposal; This research is conducted on the use of waste and by-products in concrete. These products include concrete demolition, waste glass and brick, each waste has a specific effect on the behavior of fresh and hardened concrete. The research program therefore includes work on waste recycling construction / demolition and by-products, as well as the development of new materials : traditional concretes/self-compacting or mortars based on these recycled aggregates with integration of Algerian raw materials. In our study, the development of a first variety of conventional concretes was by varying the substitution rates of recycled concrete coarse aggregates: )0 - 25 - 50 - 100 %( with variation in cement dosage : 250, 350 and 450 Kg/m³ and rates of )0 - 25 - 50%( of glass waste for a second variety, while for the production of self-compacting concretes, we have adopted rates of )0 - 10 - 20 - 30 - 40 et 50%( of powder brick waste and )0 - 25 - 50- 75 - 100%( of brick waste sand for mortars. In this study, we have seen the behavior of fresh and hardened of different materials developed with recycled aggregates, by comparing the results with other previous studies. The recycled concrete aggregates are generally more absorbent and less dense than ordinary aggregates. The shape of the recycled aggregates is similar to that of the crushed stone. Concretes made with these aggregates have good handling qualities, The compressive strength will vary depending on the substitution rate. More the substitution rate of recycled aggregates is increasing compressive strength decreases, and then we can use these aggregates with limited rates in concrete and mortar.