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RECYCLING READY MIX CONCRETE BATCH PLANT WASHING WATER FOR CONSTRUCTION APPLICATIONS
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Volume Title: ICASGE2017
DOI: ICASGE-MAT
Authors
Abstract
Due to world water crises and increasing disposal cost of waste water, new trends needs to be proposed toward recycling industrial water in concrete industry. On the other hand, ready mix concrete batch plant washing water has harmful impact on regular sewage system or the surrounding landfills as well as the environment ecology due to its high PH value. In this study, feasibility of recycling washing water, obtained from ready mix concrete batch plants, around Tanta City – Egypt, was investigated as mixing and curing water for cementious materials. The main chemical composition and physical properties were determined for randomly obtained, for long period, samples of washing water samples. Chemical composition of the selected samples (such as chloride ions, sulfate ions, sodium chloride, PH and alkalinity) and physical properties (such as total hardness, conductivity and turbidity) were measured for these samples. Performance of cement mortar specimens mixed with freshly obtained and 7-days stored washing water were compared with that of samples mixed with tap water as well as tap water replaced with 50 and 75% washing water. Physical (i.e. flow, initial and final setting times) and mechanical properties (i.e. compressive at 7-28-56 days) of mortar specimens were measured. On the other hand, some washing water samples were used for curing tap water mixed mortar specimens and the compressive strength for these samples were investigated. Mainly, the influence of washing water on mortar specimens was obviously depended on their chemical analysis. However, within the investigated water samples, replacing tap water with batch plant washing water, had no significant impact on the mortar physical and mechanical properties. While 25% of the mortar mixed with the investigated washing, water achieved average compressive strength increment of 40%. Further investigation is currently running to explore the impact of applying selected treatment techniques on the batch plant washing water efficiency as mixing and curing water for various cementious material applications.
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