Bitumen-Concrete-Asphalt-Soil & Gravel-testing-Roadlab 2020
Sand and Gravel Materials. The need for sand and gravel is usually dependent on how one intends to use this material. Sand and gravel is made up of various kinds of stone and limestone, and is mainly used in the manufacture of cement. However, other types of sand like yellow building sand is generally used to make concrete and for laying bricks.