Elham Atashgahia - MSc Structural Engineering, Islamic Azad University of Shahrood;
Pejman Aminianb - Assistant Professor, Islamic Azad University of Shahrood;
Mahsa Pahlavan mosavari - Ph.D. student of Structural Engineering, Ferdowsi University of Mashhad

One of the most important and growing industries globally and Iran is the concrete industry. Duringand after the construction phase and curing, a significant amount of water is used to make concrete.Therefore, we can use the wastewater in different ways in concrete. In this study, ۳۶۰ specimens withvarying percentages of wastewater in eight values of zero (instance), ۱۵%, ۲۵%, ۴۵%, ۵۰%, ۷۵%, ۹۰%,and ۱۰۰% of wastewater were prepared and compared with potable water in terms of compressivestrength, water absorption, freezing and melting, and a fitting curve is also investigating to determinethe compressive strength of ۷- and ۲۸-day concrete in different wastewaters. Wastewater existencereduces the compressive strength by ۱۰ to ۱۷%, and the wastewater reduced the resistance to freezingand melting of ۲۸ days of concrete and water absorption of ۷ and ۲۸ days of concrete regarding thepresence of impurities in the wastewater. The study of compressive strength and the cycle of melting andfreezing of concrete makes it possible to better evaluate the possibility or impossibility of thisenvironmental method due to the reduction of resistance in different conditions, and if appropriate, due toincreasing water shortage in the world, especially in Iran. , This method can be used. According to theresults of this study, up to fifty percent of water consumption can be used as waste.

Concrete, Wastewater, Compressive strength, Freezing, Water absorption