In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint? 1. Copper slag 2. Cold mix asphalt technology 3. Geotextiles 4. Hot mix asphalt technology 5. Portland cement. Select the correct answer using the code given below:
A.4 and 5 only
B.1 and 5 only
C.1, 2 and 3 only✓ Correct
D.2, 3 and 4 only
Explanation
Copper slag (waste reuse), cold mix asphalt (low energy) and geotextiles (durability with low emissions) reduce environmental impact. Hot mix asphalt and Portland cement are energy- and carbon-intensive.
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