- In
transport engineering,
subgrade is the
native material underneath a
constructed road,
pavement or
railway track (US:
railroad track). It is also called...
- in
American English) and
ballast (or slab track), plus the
underlying subgrade. It
enables trains to move by
providing a dependable, low-friction surface...
- 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...
-
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...
-
perpendicular to the rails, ties
transfer loads to the
track ballast and
subgrade, hold the
rails upright and keep them
spaced to the
correct gauge. Railroad...
-
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...
-
borings are
taken to
determine the
subgrade condition, and
based on the
relative bearing capacity of the
subgrade, the
specifications are established...
- 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...
- the
native subgrade. In
areas with very soft or
expansive subgrades such as clay or peat,
thick gravel bases or
stabilization of the
subgrade with Portland...
- the land
surface through which it p****es,
known to
highway engineers as
subgrade material.[citation needed]
Terms similar to dirt road are dry-weather road...
