With more than 200 aggregate production sites and distribution terminals across the U.S. and Canada, Heidelberg Materials is one of North America’s leading producers of construction aggregates. Aggregates are truly foundational. They make up 94% of asphalt pavement and 80% of concrete. They are a vital component of our homes, from the concrete in the basement to the shingles on the roof. They are the bedrock of our infrastructure – the roads, airports and waterworks that fuel our lifestyle and economy. “Aggregates” is a general term for rocks and minerals used in a variety of industries for a range of purposes. Aggregate is classified by particle size and consistency. There are two basic types: sand and gravel (sometimes called natural stone) and crushed stone. More recently a third type of aggregate has emerged: recycled concrete aggregate, which is produced by crushing concrete reclaimed from demolished highways, buildings and other structures.