Road Construction Materials and their Properties:

Road Materials

Road Construction Materials and their Properties:

Aggregate influence, to a great extent the load transfer capability of pavements. All materials should be thoroughly tested before using for construction. The goal should be to make pavements layer to act monolithically.

There are various materials used for road construction.it will be explained step by step

Asphalt: A natural or artificial mixture of bitumen and other materials.

Bitumen: A solid and viscous material having binding and waterproofing properties. Its is derived from petroleum by refinery process.

Coarse Aggregate: These are either crushed or broken stone form quarry, crushed slag, kanker or laterite of suitable quality.it shall confirm the physical requirement and size range before used it.

It is the most important material use in road construction either in flexible or rigid pavement. It accounts for 75% to 98% of material of base and surface course.

Its usage in road construction like 95% of base or sub-base course, 95% of bitumen surface (Flexible pavement) and 75% of RCC (Rigid Pavement).

Screening Material: Its smaller aggregates to fill voids of the coarse aggregate. It is generally consisting of same material as the coarse aggregate. 95% of material should pass through 13.2 mm screen.

Grit: These are ten-millimeter aggregate and most common types of screening.

Rubble: Type of coarse aggregate size approximately 230mm- 300mm (9”-13”).

Metals: The term metal used for quarry materials coarse aggregate, its available in different size range from 32-40mm, 40-63mm and 63-93mm.

Fine Aggregate: Usually categorized as material less than 2.8mm in size. It can be natural sand, quarry, or mixture of both. Fine aggregate mostly used for concrete. This size of material if used to fill voids is characterized as screenings.

Moourm: It is the type of soil which is particularly used for road work. it’s usually reddish to yellowish in colors, when compacted it form hard and impervious surface.