Course Sand White are an essential ingredient in concrete serves as reinforcement to add strength to the overall composite material. Course Sand are natural sand or crushed stone generally consist of naturally occurring, water or wind born pieces of rock in buried or current stream beds or dunes. Sand is generally formed by the weathering of rocks. It is naturally obtained from the banks or beds of rivers and it consists of fine rounded grains. The presence of fine rounded grains is due to mutual attrition under the action of water current. It is generally white or grey in color.