Waste And By-Products Recycled For Concrete

Abstract The industry of building materials is always accompanied by secondary products or waste which have an incidence on the environment. The management of solid waste is one of main environmental concerns in the world. With the rarity of the space of discharge the use of waste became an interesting alternative in the elimination the research is led on the use of waste and concrete products it is not only economic but also help to reduce the problems of elimination the research program thus includes the works concerning the valuation of the waste of constructiondemolition and under products as well as on the development of new materials and products mortar or concrete with these recycled aggregates. We present in this article the results of a vast experimental program dedicated to the study of a variety of mortars and concretes with substitution aggregates waste of construction demolition and under products. We chose as basic parameters The origin of the waste of bricks or of concrete of demolitionThe substitution rate recycled aggregates 0 - 25 - 50 - 100The variation of the dosage in cement 250 - 350 and 450 Kg m.By studying these parameters we were able to observe the behaviour to the state of fresh and hardened various materials developed with the recycled aggregates. The recycled concrete aggregates are generally more absorbent and less dense than the ordinary aggregates.the shape of aggregates is similar to that of the crushed stone. Concretes made with aggregates resulting from the recycling present good qualities of handiness durability and resistance in the action of the freeze-thaw. the compressive strength varies according to the initial resistance and the relationship watercement of the new concrete. As for any new source of aggregates it is necessary to control the durability the sise grading and the properties of aggregates.