Base course
A. Subgrade
B. Subbase
C. Base course
D. Paver base as binder course
E. Pavers as wearing course
F. Fine-grained sand
The base course or basecourse in pavements is a layer of material in an asphalt roadway, race track, riding arena, or sporting field. It is located under the surface layer consisting of the wearing course and sometimes an extra binder course.
If there is a sub-base course, the base course is constructed directly above this layer. Otherwise, it is built directly on top of the subgrade. Typical base course thickness ranges from 100 to 150 millimetres (4 to 6 in) and is governed by underlying layer properties. Generally made of a construction aggregate, it is spread and compacted to at least 95% relative compaction, thus providing a stable foundation for additional layers of material.[1][2]
Aggregate base (AB) is typically a mix of different sizes of crushed rock Page Template:Fraction/styles.css has no content.20 mm or 3⁄4 in Aggregate Base, Class 2, is used in roadways and consists of rock particles of size Page Template:Fraction/styles.css has no content.20 mm (3⁄4 in) and less. An aggregate is normally made from newly quarried rock, or it is sometimes allowed to be made from recycled asphalt concrete and/or Portland cement concrete.
See also
References
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- ^ Page Module:Citation/CS1/styles.css has no content.Lay, M. G. (2009). Handbook of Road Technology (4 ed.). Taylor & Francis. ISBN 978-0203892534.
- ^ Page Module:Citation/CS1/styles.css has no content.Phatak, D. R.; Gite, H. K. Highway Engineering. Nirali Prakashan. ISBN 978-8185790923.
