Recycling and recovery of waste are now considered as a solution for the future to protect the environment. The marble processing workshops on the other hand, generate a large amount of waste in the form of powder and small parts. Due to these facts, the aim of this study is to valorize marble waste in the form of powder and crushed aggregates (sand) as additions in cementitious matrix building materials. The characterization of the materials used to formulate mortars based on natural dune sand with marble powder and mortars based on mixed sand (dunes sand and crushed sand) and marble powder was measure. In this sense, several series have been studied, varying the addition rate of the marble powder in order to reduce the porosity of the cement matrix, using crushed marble sand to increase the granular cohesion and using of a reducing water admixture (MEDAPLAST SP40) for more performance mortars. Very appreciable results were observed for a dosage of 15% of marble powder and for the combination of 15% of marble powder with 20% of crushed marble sand. This research recommends recycling 35% of marble waste in the cement matrix that contribute effectively to the preservation of the environment.

Demand for aggregates is growing considerably in line with the development of construction in Algeria. To overcome it, it will be necessary to ensure a rational exploitation of the aggregates available to the country by aevaluation of the existingresources. According to the statistics, the glass wastes accounted for 7% of the world’s solid wastes. The glass wastes can be used in concrete production in two forms: replacing part of aggregate or using as supplementary cementmaterial to replace cement. Using glass wastes to produce recycled aggregates for the production of new concrete reduces the consumption of natural resources as well as landfills.This work consists in formulating a micro-concrete with a substitution of 5 to 25% by weight of crushed calcareous aggregates of fraction 3/8 by glass aggregates of the same fraction 3/8. The incorporation of glass wastes as an aggregate in the micro-concrete plays a role of skeleton and improves its compressive mechanical strength.The compressive strength is considerably improved by substitution of crushed calcareous aggregates by recycled glass aggregates. The optimum has been reached for a value of around 46 MPa for a substitution of 10% of crushed limestone aggregates. The substitution of 10% crushed gravel by crushed glass allows improving the strength of more than 27%.The results obtained provedthat waste glass can be used as an aggregate for producing micro-concrete with a relatively high strength which will not deteriorate with time.