'Bitumen emulsion' in road construction is used primarily for:
Choose the correct answer
High temperature hot mix paving only
Cold application — prime coat, tack coat, surface dressing, repair works without heating bitumen
Water proofing of building roofs only
Concrete road construction
Correct Answer
B. Cold application — prime coat, tack coat, surface dressing, repair works without heating bitumen
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Bitumen emulsion (IS 8887): bitumen dispersed as fine droplets (0.1–5 μm) in water with emulsifier. Grades: RS (Rapid Setting), MS, SS (Slow Setting). Applied without heating — works at ambient temperature. Used for: cold mix, surface dressing, prime coat, tack coat, repair. 'Breaks' (demulsifies) on contact with aggregate releasing bitumen. Environment-friendly (no heating, low energy).
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