Atlas Technology

 Water-bound macadam (WBM), also known as water mix macadam, is a type of road construction material used for pavement layers. It is a simple and economical method of road construction that was commonly used in the past but has been largely replaced by more modern techniques. Water-bound macadam consists of four layers: sub-grade, sub-base, base, and surface course. The sub-grade is the natural soil or compacted earth on which the road is built. The sub-base layer is made up of compacted aggregates like gravel or crushed stone, which provides additional strength and stability to the road. The base layer in water-bound macadam is composed of a mixture of coarse aggregates, such as crushed stone or gravel, and fine aggregates like sand. These aggregates are uniformly mixed with water and compacted to form a dense, bound layer. The water helps in the compaction process and promotes the binding of aggregates. The surface course is the topmost layer of the road and is also made of water-b