Concrete and Asphalt Crushing and Recycling

No. Suitable feed must be characterized and separated from asbestos, hazardous coatings, chemicals, gypsum, wood, garbage, excess soil, and other contamination. Reinforcing and embedded items require removal. Harrowgate inspects source areas and feed piles, quarantines suspect material, and routes only accepted concrete into the crushing circuit.

Only if representative testing demonstrates that the processed material meets the project’s specified OPSS or municipal Granular A requirements and the engineer accepts its use. Crushing alone does not assign a product class. Gradation, fines, durability, contaminants, and other properties are controlled by feed, crusher, screen, and quality testing.

Large reinforcing is exposed and cut during feed preparation. After primary crushing, conveyor magnets recover ferrous steel, and manual or mechanical picking removes remaining wire and fragments. Product is inspected after screening. Recovered metal is stockpiled separately, while excessive steel in feed is returned for further preparation rather than forced through equipment.

Water sprays and fine mist are applied at the feed, crusher, discharge, screen, and stockpile transfer points as conditions require. Feed drop heights and speeds are controlled, haul roads are maintained, and processing pauses during conditions that defeat control. Water use is balanced to suppress dust without producing turbid runoff or saturated aggregate.

Only where the product specification and engineer permit a defined blend. Asphalt-coated particles affect compaction, drainage, and material behaviour. Harrowgate keeps feed streams and stockpiles separate, then blends by controlled proportions if approved. Unrecorded mixing is not used to make an off-spec product appear acceptable.

It is practical where sufficient clean feed, processing space, product demand, schedule, access, and environmental permissions justify mobilization. Noise, dust, vibration, neighbours, utilities, stockpiles, runoff, and haul routes must be manageable. Harrowgate compares on-site processing with off-site recycling based on total handling and acceptance requirements.

Records can include feed-source logs, production dates, estimated quantities, test-lot boundaries, gradation and material results, accepted product use, metal recovery, rejected material, stockpile surveys, and receiving tickets. Harrowgate reconciles these quantities so owners can distinguish recycled product placed on site from waste and surplus shipped elsewhere.