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


Base Course






Base Course | Base Course Rests Directly | Roads


The base course rests directly on top of the roadbed and is often made up of compacted gravel. If the roadbed material itself is suitable, it may be treated, or stabilized, and used as the base. Soil can be stabilized by adding or mixing materials such as calcium chloride, bituminous material, lime, or portland cement to the soil. For very inexpensive, light-traffic roads, stabilized soil alone can suffice as the finished road surface. Drainpipes are usually installed within the base course to control rain and moisture drainage. Without adequate drainage, roads may buckle or collapse as water swells the ground underneath. Some roads include a second base layer, called the top course, for extra support. (Base Course, Base Course Rests Directly, Roads)

Base Course | Base Course Rests Directly | Roads