Getting rid of concrete waste can be a major problem for concrete producers. One environmentally safe and fiscally viable solution is a nonchloride system that alters cement setting behavior and permits reuse of nearly all returned concrete and washwater.
The system uses a stabilizer to stop hydration, preventing the concrete from setting. The truck can then be left for a given amount of time. When the concrete is needed, an activator is added to the mixture, along with additional concrete to be batched to the truck.
This technique saves up to 90% of the water normally used during washout and can increase concrete strength from 5% to 20%.