Conclusion
In conclusion WBM roads (Water Bound Macadam) have proven to be reliable and cost effective solution for road construction, and the use of coarse aggregate and water in the process of construction result in a durable road surface with good load-bearing capacity, WBM roads exhibit resistance to water damage and it can withstand heavy traffic, making.
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How to reshape the surface of a WBM road?
Reshaping the surface to the necessary grade and camber removes the grooves where they are present.
Before laying the coarse Aggregate, 50mm wide by 50mm deep furrows are cut at a few meter intervals and 45 degrees to the center line of the carriageway if the existing surface will serve as the WBM road. 2.
Lateral Confinement of Aggregates:.
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Materials Required For The Construction of WBM Road
There are mainly three types of construction materials required for the construction of WBM roads:.
1) Coarse Aggregate.
2) Screening.
3) Binding Material Read More: Types of Road Pavement & Difference between Flexible and Rigid Pavement
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What is screening material for construction of WBM road?
Screening material is nothing but the aggregates of smaller size than the course aggregates.
Below table shows the standard grading required of screening for construction of WBM road.
In order to reduce the overall cost of WBM road, IRC has recommended to use non-plastic materials such as:
kankar nodules murum or gravel. ,
What is WBM road construction procedure?
WBM road construction procedure is given below in detail.
The materials are compacted but don’t act as monolithic mass and deformation occur from top to bottom.
The flexible pavement generally consists following basic layers:
subgrade base sub-base and surface layer. ,
What Is WBM Road
The full form of WBM is Water Bound Macadam Road which is the most commonly used road construction procedure for more than 100 years.
The Water Bound Macadam is named based on the Scottish engineerJohn Loudoun Macadamwho first introduced and construct the WBM road.
Water Bound Macadam is a type of flexible pavement in which the base and surface lay.
