Water Bound Macadam (WBM) base course derives its strength from:
Choose the correct answer
Bituminous binding material
Interlocking of crushed stone aggregates bound with stone dust and water
Cement grouting
Sand filling
Correct Answer
B. Interlocking of crushed stone aggregates bound with stone dust and water
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WBM base uses crushed stone (53-26.5 mm) compacted in layers with stone screenings and binding material (stone dust, moorum, or kankar), with water used for rolling. Strength comes from stone-to-stone contact and interlocking. Being replaced by WMM (wet mix macadam).
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