Its some kind of flooriing for road material
WBM stands for Water Bound Macadam, and the term WBM road was derived in the memory of an engineer by name Macadam who designed and formulated this road section. This road is laid by binding the in-situ layers of boulders, stones, fine aggregates and fillers. The filler is made from the mixture of sand combined with either moorum quary dust, or soil that is avilable in that locality.The filler is mixed with water and is used to fix stone boulders and the layers of coarse stones of varying sizes by compacting with a road roller to form the base of a road. The road can be used in this form itself.As an improvement, you can apply concreting or black topping above the WBM to make it better.Please see related link for the method of preparation a WBM road.
WBM stands for Water Bound Macadam, and the term WBM road was derived in the memory of an engineer by name Macadam who designed and formulated this road section. This road is laid by binding the in-situ layers of boulders, stones, fine aggregates and fillers. The filler is made from the mixture of sand combined with either moorum quary dust, or soil that is avilable in that locality.The filler is mixed with water and is used to fix stone boulders and the layers of coarse stones of varying sizes by compacting with a road roller to form the base of a road. The road can be used in this form itself.As an improvement, you can apply concreting or black topping above the WBM to make it better.Please see related link for the method of preparation a WBM road.