ompact properly under rolling, these places are corrected by
taking out the material and back filling with new material that will
properly compact under the roller.

The aggregates for the concrete may be distributed along on the
prepared subgrade or may be stored in stock piles or bins at
convenient points. If stored on the subgrade, a traction mixer is
employed which is drawn along the road as the work progresses, the
materials being placed directly in the mixer. If stored at a central
point, they may be transported to the mixer on the road and dumped
directly into the mixer, or the mixer may be set up at the storage
piles and the concrete hauled in trucks to the road where it is
deposited and shaped.

The concrete is spread to the proper thickness and tamped either by
hand or by machinery. If the marginal curb is to be employed, it is
constructed immediately after the concrete for the base has been
finished but before the cement begins to set.

After the foundation concrete has set, the bedding course is spread
and struck off to the proper thickness. When the bedding course
consists of sand-cement mortar, the sand and cement are mixed dry and
spread to prescribed thickness. It is considered to be desirable to
roll the sand bedding course with a light hand roller before the brick
are placed, but the sand-cement bedding course is not rolled. The
bedding course must be carefully shaped by means of a templet or
strike board before the brick are placed.

The brick are laid in straight courses across the pavement, with the
spacing lugs all in the same direction if brick with spacing lugs are
employed, and with the lugs in contact with the brick of adjoining
courses. If brick without spacing lugs are used they are laid loosely
so that there will be room for the filler between the brick of
adjoining courses.

After the brick have been laid they are rolled to bed them in the sand
or sand-mortar bedding course and thus secure a smooth surface. For
this purpose a light, power driven, tandem roller is used and the
rolling is continued until the brick are thoroughly bedded. Any
defective brick that are noted are removed and replaced with good
brick and after this culling has been completed the surface is once
more thoroughly rolled. If a cement-sand bedding course is employed,
the surface is sprinkled just after the final rolling so that water
will flow down between the brick and moisten the bedding course
sufficiently to