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UPSC Prelims 2020 Paper-1 📅 04 Oct, 2020

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
1, 2 and 3 only
B
2, 3 and 4 only
C
4 and 5 only
D
1 and 5 only
Result Summary
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UPSC Prelims
2020 • 04 Oct, 2020 • Paper-1
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:
Correct Answer
1, 2 and 3 only
Sustainable Aggregates: The utilization of Copper Slag (an industrial waste by-product) prevents landfill dumping and replaces natural aggregates (like mined st......
Ref/Book : UPSC Prelims 2020
Ref. Subject Environment
Chapter -
Ref. Topic Pollution
Pg. No -
💡 Analysis & Explanation
Sustainable Aggregates ▼
The utilization of Copper Slag (an industrial waste by-product) prevents landfill dumping and replaces natural aggregates (like mined stone), highly enhancing environmental sustainability. (Point 1 is sustainable).
Temperature Mechanics in Paving ▼
Cold mix asphalt does not require the heavy heating of aggregates, thus eliminating the massive fossil fuel consumption and emissions associated with traditional Hot mix asphalt. Therefore, Cold mix (Point 2) reduces the carbon footprint, while Hot mix (Point 4) drastically increases it.
Stabilization Technology ▼
Geotextiles are synthetic permeable fabrics that prevent soil erosion, improve drainage, and prolong the lifespan of rural roads, preventing frequent, resource-heavy repairs. (Point 3 is sustainable).
Cement Emissions Profile ▼
The production of ordinary Portland cement is one of the world's most carbon-intensive industrial processes. Replacing it, rather than preferring it, is the goal for carbon reduction. (Point 5 is anti-sustainable).
Conclusion ▼
Technologies 1, 2, and 3 actively align with modern eco-friendly road construction paradigms.
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