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:
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A hard Environment multiple-choice question from UPSC Prelims 2020. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: A. 1, 2 and 3 only
Copper slag (reuse of waste), cold mix asphalt (no heating, lower emissions) and geotextiles (durable, less material) are preferred for sustainability (1, 2 and 3). Hot mix asphalt and Portland cement are energy- and carbon-intensive.
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