June 12, 2007 - ...recycling asphalt and concrete to meet rising demand for aggregates -- rock, sand and gravel -- that are building blocks for construction.Raisch has been recycling these building materials from demolition projects since 1985. The company has manufactured and recycled about 12 million tons of rock and debris for use in roads, bridges and buildings.In a report released in February, the California Department of Conservation issued a warning to local planners that the supply...