Paper Title
Concrete Washout Wastewater Recycling in Ready Mix Concrete Plants

Abstract
The Concrete washout or waste wash-water (WWW) is one of the most environmental problems associated with ready-mix concrete production. This study evaluated the potential of WWW recycling in ready mix concrete plants in Jordan. A representative waste wash water sample (400 L) was collected from a basin in a ready-mix concrete company. A pilot plant for WWW treatment on the lab scale was fabricated and installed. The results show that the raw WWW was not acceptable as mixing water even after dilution as it led to significant reductions in concrete compressive strength and low workability. However, the WWW from the settling pond, the filtered WWW and the filtered-neutralized WWW at dilution ratios up to 75% were shown to be potential alternatives to fresh water for ready-mixed concrete. Therefore, the current guidelines for mixing water quality should be revised to encourage the reuse of the WWW. Keywords - Concrete washout, Waste Wash-Water, Ready-Mixed Concrete, Compressive Strength, Environment.