Daniel E. Sullivan 2006 Summary: Natural aggregates (construction sand and gravel and crushed stone) make up the largest component of nonfuel mineral materials consumed in the United States. Most of these materials are used in construction activities, such as in buildings and roads. In highways, natural aggregates are incorporated into asphalt and concrete and are used as road base. application/pdf 10.3133/fs20063127 en Materials in Use in U.S. Interstate Highways reports