Tar and chip is similar to standard blacktop in composition. Both types use asphalt cement as the ingredient which creates adhesion to the aggregate. Blacktop is mixed at a central plant. The asphalt cement completely coats various sized pieces of aggregate. Tar and chip surfaces combine either a special cutback liquid asphalt cement or an emulsified asphalt cement and small similar sized pieces of clean, angular, washed gravel. These ingredients are mixed together at your house.