Application of High Content of Volcanic Ash in High Strength Concretes

Abstract

In this research, CEM II/A-P 42.5R cement was replaced by 20% of local volcanic ash with different Blaine values and fly ash from Turkey, and C40/50 flowing concretes were prepared. Target initial flow diameter of concretes was kept at 63±2cm. Slump-flow retention was measured after 30, 60 and 90 minutes. Complex Performance Testing System (CPTS) mortar mixer was used to determine the water demand of mortar phase of the C40/50 concretes. Hydration heat of each mortar phase was measured with the semi-adiabatic container. Heat development was observed up to 48 hours and maximum temperature, time to maximum temperature, duration of maximum temperature was compared. Finally, high content of local volcanic ash can be used in high strength flowing concrete production, and at least 11% heat reduction with VA replacement could be an advantage in mass concretes.