4.Name of Black and sticky solid used for making Road
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Answer:
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Bitumen is a black sticky substance which is obtained from tar or petrol and is used in making roads.
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Answer:
Bitumen is the substance used for making road
Explanation:
The materials required for road construction depend on the type of road (highway, national highway, MDR, rural road, etc.), the weather required for the road, the load on the road, and the section of the road. The country where the road is built. , availability of local materials, road economics etc. there are other little things too.
Roads will be constructed in the following sectors: National Highways by IRC and MORTH India, for State Highways
The first is embankment, which uses good quality soil depending on soil availability, but can also use silver sand, which must be trapped in the soil.
The latter is a subgroup. The sub-layers generally consist of good quality soils that have a higher bearing capacity than the embankment and are rich in terms of other laboratory tests. The thickness of this layer is usually kept at 500 mm according to the plan.
The third is under the bass. It is generally a drainage layer and consists of suspended particles. This granular material is obtained from crushed stone mills. Also known as GSB. The thickness of this layer is usually kept at 200 mm according to the plan.
The fourth base layer is WMM (Wet Mix Macadam). It is a mixture of 40 mm, 20 mm and 10 mm aggregates, stone powder etc. in standard proportions. It consists of clean, ground and granulated aggregates mixed with other granular materials and water and rolled into a compact mass on the prepared surface. The thickness is basically kept at 250mm.
The fifth period is the installation period: including DBM (High Density Bituminous Macadam) and bituminous concrete (BC). The thickness of these layers depends on the type of road, whether it is a national highway or a national highway.
Apart from all the above materials, bitumen emulsion is also required as per IRC-16.
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