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In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint ?

Copper slag
Cold mix asphalt technology
Geotextiles
Hot mix asphalt technology
Portland cement

Select the correct answer using the code given below :

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UPSC CSP Previous Year Paper (2020)

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1, 2 and 3 only

2, 3 and 4 only

4 and 5 only

1 and 5 only

Explanation:

The copper slag and fly ash were found to be non plastic in nature. This property is beneficial for use in sub base layer of road pavements.
The government on May 2020 said coir geo-textiles will be used in the construction of rural roads under the third phase of Pradhan Mantri Gram Sadak Yojana (PMGSY-III).
Coir geo-textiles are permeable fabric, which are natural, strong, highly durable, resistant to rots, moulds and moisture, and free from any microbial attack.
The wide use of hot mix technology leads to environmental pollution as these plants emit a huge amount of Greenhouse gases. Cold Mix on the other hand is a pavement technology without heating the aggregates using cationic bitumen emulsion.
The usage of Cold mix bitumen Emulsion in India is a sustainable technology and ideal for India as use of bitumen emulsion negates the heating of aggregate and binder.

Hence option 1st is correct.

By: Abhipedia

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