Present experiment study focused on manufacturing and properties of Alkali Activated Coarse Aggregate (AACA) by method of pelletization. The manufacturing of AACA using Ground Granulated Blast Furnace slag (GGBS) and alkali activator solution. The sodium hydroxide and sodium silicate were alkali activator solutions. The concentration of sodium hydroxide maintained as six molarity and ratio of sodium silicate to sodium hydroxide was 2.5.AACA were manufactured using drum mixer by maintain a 45 degree angle and speed of the mixer was 20 rpm for 2.5,3,3.5,4 and 4.5 minutes. It is observed that the speed of mixer is also affects the properties of aggregate, especially loose bulk density and absorption of water. Specific gravity of AACA is between 2.6 -2.7, which is similar to Natural Aggregate. From SEM image show that the packing density for NA is higher to AACA may be the reason of low water absorption of NA