Road - INTRODUCTION
TYPES OF ROADS
Highways
Urban Streets
Rural Roads
ROADWAY ENGINEERING
Roadbed
Base Course
Wearing Course
Bituminous Pavement
Concrete Pavement
ROAD PLANNING AND ADMINISTRATION
HISTORY OF ROAD CONSTRUCTION


AUTOMOBILE
AUTOMOBILE INDUSTRY
PUBLIC TRANSPORTATION
TRUCK


Bituminous Pavement






Bituminous material | Asphalt


Bituminous pavements, Bituminous material, Asphalt

A steamroller is used to flatten materials such as hot asphalt to build roads. With its drums, or large heavy rollers, it compresses the asphalt while its water tanks apply water to cool the surface. (Bituminous Pavement, Bituminous material, Asphalt)

Bituminous pavements are made with by-products of petroleum, such as asphalt. Weather and seasonal changes can cause roadways and the earth below them to rise or fall slightly. As these natural shifts occur, bituminous pavements allow the road surface to bend or flex slightly without breaking. (Bituminous Pavement, Bituminous material, Asphalt)

Bituminous material softens when heated and can be prepared and applied in a wide range of concentrations. Thin layers of bituminous material are sometimes applied with a pressure sprayer to the base course or the top course. The bituminous material seeps into the crushed rock and penetrates the tiny spaces between the compacted rocks, binding the aggregate together. To provide traction for moving traffic, a thin layer of aggregate may then be spread over the bituminous material and compacted. (Bituminous Pavement, Bituminous material, Asphalt)

Asphalt, a thick bituminous material, can be used directly as a pavement. Asphalt can be applied in thin overlays less than 2 cm (0.75 in) deep or in layers several centimeters deep, depending on the type of surface and its purpose. Asphalt is commonly mixed with aggregates for added strength and traction. The asphalt and aggregates are usually mixed and heated at a central location. The material is then transported to the construction site, where it is spread directly over the base course or top course and compacted. Asphalt surfaces are fairly easy to construct and repair. (Bituminous Pavement, Bituminous material, Asphalt)

Bituminous Pavement | Bituminous material | Asphalt