Lehigh Hanson, Inc. has a big crush on the concrete materials business in North America. The company, which is part of German construction materials firm HeidelbergCement, produces aggregates (crushed rock, gravel, and sand), cement, ready mixed concrete, asphalt concrete block, concrete pipe, and pre-stressed concrete products in the US and Canada. Lehigh Hanson affiliate companies include Lehigh Cement Company, Hanson Brick, and Hanson Pipe & Precast, which makes concrete pipes, manholes, and precast concrete products. Its hardscapes division makes decorative paving stones for landscaping.