Abstract
Concrete is the most popular construction material in the world and consume lots of water for its proper functioning. The quality of the water obtained from different sources and used for concreting plays an important role on the prosperities of fresh and hardened concrete. In this paper, different water sources and their effects on the properties of concretes are discussed and determined the effect of deionised water, alkaline substance (Na2CO3 and NaHCO3) and presence of algae in water on setting times and compressive strength of mortar/concrete. The constituents present in water may affect the chemical reactions/hydration and thus affect the fresh and hardened properties of concrete. The presence of Na2CO3 and NaHCO3 in water used for concreting affects the setting times and compressive strength of the concrete. Concentrations of Na2CO3 and NaHCO3 more than 4 g/L significantly affects the setting times of mortar.
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