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Glossary for Concrete Reclaiming Article

1.) Concrete: is a building material that hardens as it dries and is made from stone, aggregates, sand, cement, and water.

2.) Cement: an ingredient used in the production of concrete; the "glue-like" element of concrete that helps bind all raw products together.

3.) Concrete reclaiming: the process of separating returned concrete into raw materials for future production of new concrete; open loop and closed loop are types of concrete reclaiming systems.

4.) Open Loop System: a concrete reclaiming system that a series of settling pits/ponds to separate stone, sand, and aggregates from gray/processed water; reuses some raw materials from returned concrete, but also produces waste.

5.) Closed Loop System: one of two common methods for concrete reclaiming that uses a machine to separate stone and sand from gray/processed water. The gray/processed water is stored in an agitator pit to keep cemetitious material suspended in the water with the use of large paddles. All products are reused in the production of new concrete; characterized by zero waste, zero discharge.

6.) Settling pit: pits or ponds used in sequence to filter stone, sand, and cementitious material from water; final pit/pond in series contains 'clarified water' for use in production of more concrete or truck washout.

7.) Agitator pit: a large pit that is used to store gray/processed water; large paddles are used to keep cementitious material suspended in the water to then be used in the production of new concrete.

8.) Returned concrete: concrete that is brought back to concrete manufacturers in mixing or pumper trucks because it was not used on-site or in the project it was ordered for. This must be dealt with in a reasonable amount of time because the trucks need to be cleaned out to avoid concrete drying inside the barrel of the truck.

9.) Processed/gray/slurry water: is water that has been previously used at one time or another to clean out mixing or pumper trucks. This water can also be used in the future production of new concrete.

10.) Windrow Method: is the process of allowing returned concrete to dry and then is broken up into a smaller, finer product, which can be used to raise elevation, as a compactable fill, and much more. This process requires a great deal of time, machinery, and man-power to produce for a minimal profit.

11.) Loader bucket: a large piece of machinery with a bucket attachment on the front used for scooping up and moving materials to a different location; operated by a trained individual.