Sodium waterglass (NWG) from rice husk ash and from waste glass were prepared by separately adding each powder of RHA and WG to sodium hydroxide pellets in order to obtain sodium waterglass with molar ratios of SiO2/Na2O and H2O/Na2O equal to 1.5 and 10 respectively. The assembly was mixed with a 200 mL of distilled water for 2 h at 100 °C using a magnetic stirrer to enhance the dissolution of silica. The solutions were subsequently filtered and the liquid were used as the activators. The sodium waterglass from rice husk ash and from waste glass were denoted S1 and S2 respectively. These both activators were stored at ambient temperature for at least one week before being used in order to allow a full silica dissolution and equilibration.