Prelims 2020

Q. Steel slag can be the material for which of the following?

1.Construction of base road
2.Improvement of agricultural soil
3.Production of cement

Select the correct answer using the code given below:
a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3
Correct Answer : d) 1, 2 and 3

Question from UPSC Prelims 2020 GS Paper


Steel Slag Applications

1. Construction of Base Road

Steel slag, a byproduct of steel manufacturing, has proven to be a suitable material for the construction of road bases. Its physical properties, including high density, hardness, and angular shape, make it an excellent choice for road construction. The use of steel slag provides strength and durability to the road structure, offering good compaction and load-bearing properties. It is commonly used in base and sub-base layers of roads.

2. Improvement of Agricultural Soil

Steel slag contains essential nutrients such as calcium, magnesium, and iron, which can greatly benefit agricultural soils. It can be utilized to adjust soil pH, improve soil structure, and enhance nutrient availability. These improvements in soil quality can lead to increased crop yields.

3. Production of Cement

Steel slag can also be utilized in the production of cement. It can be used as a raw material in the cement manufacturing process or as a blending material for cement. The inclusion of steel slag in cement contributes to its properties by providing hydraulic reactivity. This reactivity leads to the formation of additional cementitious compounds when mixed with water, resulting in enhanced strength and durability of the cement produced.

Considering the mentioned applications, the correct answer is: d) 1, 2, and 3

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