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 cem

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Q: (IAS/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 :

question_subject: 

Ecology

question_exam: 

IAS

stats: 

0,158,78,158,31,22,25

keywords: 

{'carbon footprint': [0, 0, 0, 3], 'rural road construction': [0, 0, 0, 1], 'environmental sustainability': [0, 0, 0, 1], 'hot mix asphalt technology': [0, 0, 0, 1], 'cold mix asphalt technology': [0, 0, 0, 1], 'portland cement': [0, 0, 0, 3], 'copper slag': [0, 0, 0, 1]}

The correct answer is (a) 1, 2 and 3 only.

Copper slag and Portland cement have negative environmental impacts and are not preferred for rural road construction. Hot mix asphalt technology requires large amounts of energy and has a higher carbon footprint compared to cold mix asphalt technology. Therefore, the use of cold mix asphalt technology is preferred as it has a lower carbon footprint and is more environmentally sustainable. Geotextiles are also preferred as they reduce the amount of aggregate required for road construction and provide additional structural support.