This research aims to investigate the characteristics and durability of lokan seashell mortar with curing variations in NaCl solution. Seashell powder from the waste of lokan seashell which were burned in a brick furnace and filtered using no. 200 sieve. The research specimens used mortar 5x5x5 cm. Variations in the content of seashells used are 0%, 5%, and 10% of the weight of cement. The spec…