الفهرس 
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Abstract
Water is one of the main constituents of concrete. Although many types of waters exist which include fresh waters, seawaters, alkali waters, bog waters, mine and mineral waters, and waters containing sewage and industrial wastes, fresh waters are the mostly used in concrete industry. It is expected (according to UN report) that fresh water will be in shortage in many regions around the world by 2050. Concrete consumes huge amounts of fresh water annually, so there is a necessity of seeking for other suitable sources of water for concrete industry. On the other hand, utilizing these types may affect the properties of concrete, especially setting of cement, strength of concrete, volume stability of concrete mass. Therefore, the effects on the properties of concrete should be carefully investigated. For that purpose, extensive literature searches regarding the effects and the suitability of the different water types also regarding the effects of different impurities on the properties of concrete were made. In addition, experimental study was performed in which 8 types of water of various qualities and sources were tested for assessing suitability to mix concrete. The types of water are potable water, canal water, underground water, water wastes from concrete industry, seawater, treated industrial waste, industrial waste laundry refuse, and biologically treated combined waste mostly carries sewage waste. The tests performed include complete chemical and physical analyses, setting of cement, compressive strength of concrete cubes, and volume stability (length change percentage) tests. The results of the tests were analyzed and comprehensive discussions were also supplemented then the conclusions and the recommendations were summarized in the last chapter of the thesis.