Material Required For Construction of Water Bound Macadam (W.B.M) Road

Material Required For Construction of Water Bound Macadam (W.B.M) Road

The pavement made of crushed or broken aggregates, mechanically interlocked by Rolling and filling the voids with screening and binding material with the assistance of water is called water bound macadam(W.B.M)Road. 

Material Required For Construction of Water Bound Macadam (W.B.M) Road

The W.B.M can be used as a sub-base, base course or surface course. The thickness of each compacted layer of W.B.M ranges from 10 cm to 7.5 cm depending on the size and gradation of aggregates used. 

Material required for the construction of Water Bound Macadam (W.B.M) roads are as follows:

a) Coarse Aggregates

The coarse aggregates used in W.B.M generally consists of hard varieties of crushed aggregates or broken stones. However, soft aggregates like over burnt bricks metal, kankar and laterite may be used.

b) Screening

The screening is used to fill up the voids in the compacted layer of coarse aggregates. The screening consists of aggregates of smaller size, generally of the same materials as the coarse aggregates. From the economic considerations, kankar, moorum or gravel can be utilized as screening materials. 

c) Binding Materials

Binding materials consist of fine-grained materials. kankar nodules or limestone dust etc are used as binding materials in W.B.M construction.

Read Also:

Construction Procedure of Bituminous Road 

Advantages & Disadvantages of Water Bound Macadam(W.B.M)Road

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