Effect of the use of waste glass (as precursor, and alkali activator) in the manufacture of geopolymer rendering mortars and architectural tiles

•Recycled glass waste was used as alkali activator, and fine aggregate for the manufacture of render mortars.•Ecological mortars based on CW and glass waste has compressive strength between 9 and 12 MPa.•The strength of the mortar depended on the chemical composition of the system.•The utilization of glass led to mortars with similar compressive strengths comparing the elaborate with commercial and alternative silicate.•The results of isothermal calorimetry show that at room temperature, the glass has low reactivity in presence of NaOH solutions.