Portland cement has been the most commonly used binder material for concrete making.However, the production of Portland cement generates large amounts of CO2 from decarbonation of limestone.From the point of view of sustainable development, only systems where the supplementary cementing materials (fly ash, slag,metakaolin, etc) becomes the main binder will be able to meet the anticipated growth of concrete volumes.The alkali activation of waste materials can produce a binder with similar properties as Portland cement but with fewer drawbacks linked to greenhouse gas emissions.