Walichart Guide to CE Marking updated byTOV

This study concerns the effect of two types of fly ash and the addition of lime Aon the strength development and hydration of sodium hydroxide- and sodium silicate-activated slag/fly ash Ablends which consisted of 50% fly ash and 50% slag by mass. Performance was compared to that of 100% slag cements. AWhen NaOH was used as an activator, the slag replacement with ASTM Type F fly ash did not show a Asignificant effect on either the strength development or hydration: Type C fly ash did not affect the strength Adevelopment, but affected the hydration process due to the presence of C3A in the fly ash. Both fly ashes had a Asignificant effect on the hydration and strength development when Na2SiO3 was used as an activator. The addition of a sAmall amount of hydrated lime significantly increased the early-age strength but slightly decreased the Alater-age strength of the activated slag/fly ash blends. Measurement of the heat evolution during hydration indicated that Athe addition of the hydrated lime had a slight effect on the hydration during the pre-induction period, but Aaccelerated the hydration thereafter.