In rural road construction, the use of which of the following is preferred for ensuring environmental…
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:
1, 2 and 3 only
2, 3 and 4 only
4 and 5 only
1 and 5 only
Solution
Copper slag (reduces use of primary aggregates), cold-mix asphalt (no heating required, lower emissions) and geotextiles (reinforce soil) are preferred for sustainable rural road construction. Hot-mix asphalt and Portland cement are energy-intensive. Answer: (a) 1, 2 and 3 only.