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Abstract

This research aims to study the effect of secondary treated wastewater (STWW) and tertiary treated wastewater (TTWW) in concrete mixing and curing as a complete alternative to fresh water to address the water crisis. The treated wastewater used in the study was collected from two wastewater treatment plants in Orasqualia for STWW and El Shorouk for TTWW, Egypt. Chemical analysis was performed on the collected water samples to verify their compliance with the recommendations of the relevant standards used in concrete production. Physical and mechanical tests were performed on cement paste, mortar and concrete specimens. Some durability characteristic of concrete was investigated, its microstructure was analyzed, and its antibacterial properties were tested. The obtained results showed that the use treated wastewater did not affect the slump of the concrete or its air content. The compressive strength of concrete made using STWW and TTWW was 4.1% and 4.2% higher, respectively, than the compressive strength of concrete made using PW, after 220 days. Improvements in concrete properties were observed in water absorption, porosity and permeability, when using secondary and tertiary treated water. Furthermore, the results of the statistical analysis (standard deviation and coefficient of variation) showed no significant difference between the compressive strength results of the three concrete mixes at different test ages. In summary, the secondary and tertiary treated wastewater used in this study was found to be suitable for mixing and curing concrete.

Keywords

Treated wastewater, Mechanical properties, Mixing water, Mortar and concrete

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