Base, base course or surfacing course depending upon category of road. Autocad plan of cross sectional details of bitumen main road. Unlike other course aggregates it consist of mixture of hard and durable crushed.
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In each case, it shall be constructed in accordance with the specifications given in this code and in conformity with the. And over the layer of wbm, the higher surface course of bituminous macadam,. The foundation course layered as granular sub base, wbm, dense bitumen macadam and bituminous concrete at the top most.
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It includes a 20mm thick mix seal surfacing over a prepared surface with a 2% cross slope on each side and a center.
This document provides a cross section for a 2 lane bituminous road. The water bound macadam is named based. The base and surface layers. There are mainly 3 types of materials which are used in the construction of wbm road.
These types of roads are typically constructed in areas where there is low traffic volume or in rural. The full form of wbm is water bound macadam road which is the most commonly used road construction procedure for more than 100 years. Water bound macadam (wbm) is a type of road construction technique where layers of crushed stone aggregates are bound together with water and compacted to form a sturdy road surface. What are the different wbm road layers?
Water bound macadam (wbm) is a flexible type of road made of crushed stone aggregates, screenings and binding materials mixed with water.
