- In
transport engineering,
subgrade is the
native material underneath a
constructed road,
pavement or
railway track (US:
railroad track). It is also called...
- (sleepers,
British English) and
ballast (or slab track), plus the
underlying subgrade. It
enables trains to move by
providing a
dependable surface for their...
-
highway engineering,
subbase is the
layer of
aggregate material laid on the
subgrade, on
which the base
course layer is located. It may be
omitted when there...
-
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...
- 30. Hogentogler, C.A.; Terzaghi, K. (May 1929). "Interrelationship of load, road and
subgrade".
Public Roads: 37–64.
Unified Soil
classification System...
- The
California Bearing Ratio (CBR) is a
measure of the
strength of the
subgrade of a road or
other paved area, and of the
materials used in its construction...
- sub-ballast
above a
prepared subgrade/formation (see diagram). It is
designed primarily to
reduce the
stress on the
subgrade.
Other definitions include...
-
subgrade. When
building a
three layer flexible pavement, the
subbase layer is not used and the base
course is
placed directly on the
natural subgrade...
-
airplane of a
given weight on a
pavement structure for a
specified standard subgrade strength; The PCN, a
number (and
series of letters)
representing the pavement...
- pavers. The
first layer in the
construction of such a
surface is
called the
subgrade—this is the
layer of
native material underneath the
intended surface. It...
