Introduction of WBM Road

Material Required for Construction of WBM Road

• Coarse Aggregates
• Screenings
• Binding Material

1. Coarse Aggregates

1. The coarse aggregate should be durable.
2. It should be hard enough to resist the load.
3. The coarse aggregate should have acceptable shape.
4. It should be free from flaky and Elongated particles.
5. The Indian Road Congress has specified the physical requirements for the coarse Aggregates for the Construction of WBM roads.
6. As per IRC the Los Angeles abrasion value of the coarse aggregate for the construction road construction layers of Sub-base, Base course and surface course are 60%,50% and 40%
7. The Aggregate impact value of the sub-base, base course and surface course are 50%,40% and 30%

2. Screenings

3. Binding Material

Construction Procedure of WBM Road

• Preparation of the Foundation for Receiving the Water-Bound Macadam Course.
• Provision of the Lateral Confinement.
• Spreading of the Coarse Aggregates.
• Rolling.
• Application of the Screenings.
• Sprinkling and Grouting.
• Application of the Binding Material.
• Setting and Drying.
• Preparation of Shoulder.
• Opening to Traffic.

1. Preparation of the Foundation for Receiving the Water-Bound Macadam Course

2. Provision of the Lateral Confinement

3. Spreading of the Coarse Aggregates

4. Rolling on WBM

5. Application of the Screening

6. Sprinkling and Grouting

7. Application of the Binding Material

8. Setting and Drying

9. Preparation of Shoulder

10. Opening to Traffic

Advantages of WBM Road

1. The construction cost of WBM road is low.
2. There is no skilled labour required for the construction of WBM roads.
3. The construction of the water-bound macadam Road is done by the locally available material.
4. The capacity of water-bound macadam Road to take the traffic load of about 900 tonnes per lane per day.

Disadvantages of WBM Roads

1. The maintenance cost of water bound macadam road is high.
2. WBM Road is less durable as compared to other roads.
3. WBM road can cause inconvenience and danger to the traffic if it is not maintained properly.
4. WBM roads are permeable to the rainwater which can lead to the softening and yielding of the subsoil.

Maintenance of the Water Bound Macadam Roads.

1. The Water Bound Macadam roads are not more durable as compared to the other roads.
2. WBM roads required regular maintenance.
3. There may be chances of occurring potholes on the road surface of WBM roads, it should be filled with the binding material.
4. The corrugations should be removed and filled by the binding material.
5. The loose aggregate in the WBM roads will come on the surface, it should be compacted and level properly.

Who Invented WBM?

WBM Meaning

What Does WBM Mean?

What Is WBM road?

WBM Road Specification

How Is WBM Road Construction?

1. Preparation of Foundation for WBM Road
2. Provision for Lateral Confinement
3.  Spreading of Course Aggregates
4. Rolling Operation
5. Application of Screenings
6. Sprinkling of Water and Grouting
7. Application of Binding Material

WBM Road Construction Procedure

1. Preparation of the Foundation for Receiving the Water-Bound Macadam Course.
2. Provision of the Lateral Confinement.
3. Spreading of the Coarse Aggregates.
4. Rolling.
5. Application of the Screenings.
6. Sprinkling and Grouting.
7. Application of the Binding Material.
8. Setting and Drying.
9. Preparation of Shoulder.
10. Opening to Traffic.

What Is WBM and WMM?

Advantages of Macadam Roads

• Water bound macadam is superior in quality because the materials are carefully graded and the resulting mass is almost void less compacted mass.
• The interlocking of aggregate particles imparts adequate strength of the materials selected for filling the voids.

Disadvantages of Macadam Bound Macadam.

What Is Purpose of WBM?

IS Code a Wbm Road?

What Are the Defects in WBM Road?

1. Alligator Cracking.
2. Consolidation of pavement layers.
3. Shear failure.
4. Longitudinal cracking.
5. Frost Heaving.
6. Lack of binding to lowers course.
7. Reflection crushing.
8. Formation of waves and corrugation.

What Is Binding Material in WBM?

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