Valorization of glasses waste as eco-efficient cementitious materials

TREZZA M.A.; RAHHAL V.F.; A. LAVEGLIA

Praga

Congreso; 15 th International Congress on the Chemistry of Cement Prague; 2019

In recent years there has been widespread concern about the use of natural resources as well as the waste generated by human. That is why inserting waste into the productive market is seen as analternative to ensure the sustainability of the environment. Among these wastes due to their chemical and mineralogical composition, glasses (green, amber and transparent) from the urban solid waste (USW) are of interest.This works studied the possibility of using glasses as supplementary cementitious material in theproportion in which they are found in the USW and compared it with the individual reactivity of each one. The glasses have been characterized mineralogical by DRX and FTIR. The amorphous silica solution and the alkali content of glasses have been quantified as a function of the hydration time in order to identify the specific contribution of the addition. Reactivity of mixture cements have been analyzed by the Frattini method and the monitoring of hydration have been carried out by calorimetric conduction, DRX and FTIR. From the calorimetric curves, the rate of reaction and the total heat released have been determined by numerical methods. On standardized mortars, fluidity, compressive strength and chemically combined water have been determined at the age of 2, 7 and 28 days. At the first ages a stimulation of the hydration is observed due to the smaller particle size of the addition. At 28 days and due to the pozzolanic reaction, compressive strength of mortars was 25% higher than the reference.