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


Wearing Course






Asphalt Paver Spreads | Roadbed Surfaces | Roads in the United States


asphalt paver spreads

This asphalt paver spreads asphalt evenly over roadbed surfaces. A roller then follows the paver to flatten the asphalt into smooth pavement. Used on more than 90 percent of all paved roads in the United States, asphalt is a black, cementlike material usually derived from crude petroleum. (Wearing Course, Asphalt Paver Spreads, Roadbed Surfaces, Roads in the United States)

A road’s top layer, which directly supports moving vehicles, is called the wearing course. It is made of a solid layer of pavement and is designed to be smooth and to withstand erosion from traffic and weather. Two main types of pavements are used—bituminous, or flexible, pavement and concrete, or rigid, pavement. Bituminous pavement is cheaper and easier to construct, but it requires more maintenance. Concrete pavement lasts for a very long time with minimal upkeep but is much more expensive and time-consuming to build. (Wearing Course, Asphalt Paver Spreads, Roadbed Surfaces, Roads in the United States)

Wearing Course | Asphalt Paver Spreads | Roadbed Surfaces | Roads in the United States