The Bossier banner. [volume] (Bellevue, Bossier Parish, La.) 1859-1952, 1912-08-08

betrse.- -, l2-sccr ;cces. Gravel CO
tained fro! :: r. - l.; L,,Ga.i7' iaI>- D.
to Pit :-Ia,' (! .or t,,.a rel. IA ,h.t t,,H &C.
ton Of the wafer has V I'll tie pv..,.j.r>
smooth AID practically all the !.nt
binding material has been removed by
the same agency. Even if clay or loan
Is mixed with river or creek gravel the
result is not likely to be as satisfactory
as that obtained by the use OF pit gra,-
el. Pit gravel frequently contains too
much clay or earthly matter, while river
gravel may have too much sand. In
such cases il is sometimes advisable to
screen the gravel 50 as to eliminate the
material which is too fine or tia; wh;cl:
| Is too coarse. J4.e screen should be
similar to that which is .;St. in pre-
pairing material for maca,!.;m roa;
In the handling of the rrA~al care
should be exercised not to Sc? sr.;te the
binding material from it, no: should
this binding material be allr rweI to
settle to the bottom in spreadin. the
material over the road surface 1t
will often be found advisable to spread
thin layer of such binding material
over the surface after the material has
been distributed and rolled, and after
this the surface should be sprinkled
and rolled again or else rolled while
still damp from the rains.
| A large part of the gravel found in
the Atlantic coastal plane is sufficient
| ly fine and uniform to render unneces.
sary any asserting for road building
purposes, but when the gravel, espe-
cially that which is to constitute the
surface layer, contains large pebbles
these should be removed and either
| thrown aside or else raked into the
| foundation or recruShed. At least 80
per cent by weight of the gravel should
be pebbles above one-eighth inch in
size, and there should be no pebbles in
the bottom layer that will not pass
through two and a half or three inch
ring, and in the top layer there should
be no pebbles which will not pass
| through a one and one-half inch ring.
| Not over 90 per cent Of the mass
should be clay, and this should be uni
| formly mixed and should contain no
large Jumps Ten or Is per cent Of clay
produces better results than 90 per cent.
If the foundation or roadbed is loose
1t should be carefully rolled. 1t Is
! quite as important to have solid
| foundation for a gravel road as for a
mGcadam road. Gravel will compact
to about so per cent Of its depth, loose
measure, provided earth shoulders are
placed on both sides Of the road to
prevent the wasting away Of the
gravel on the sides. If gravel is abun-
dant, however, these shoulders may be
built of gravel instead of with earth.
CT, the road may be surfaced with
gravel from shoulder to shoulder. If
the compacted depth of the gravel
road is to be eight inches and the
width twelve feet it will take abeut
$3.50 cubic yards of gravel to the mile.
and it is best to make the first layer
about six inches in depth. loose meas
ure, and the second layer about four
inches in depth, loose measure.
Gravel should not be dumped direct
ly on the road, as this will usually re-
suit in a rough, uneven surface If
specially devised spreading wagons
are not used the gravel should be
dumped on boards and spread from
them on to the road.
The gravel should be placed on the
road commencing at the end nearest
the gravel pit, in order that the teams
will aid in packing the material. \
spike or tooth harrow may be used to
advantage in spreading the material.
but if the gravel contains only small
amount of binding material the har-
row should not be used, as it will have
the effect Of bringing the larger peb.
bles to the surface and shaking the
binding material to the bottom.
Each layer of gravel should be rolled
separately. The rolling should begin
at the sides and continue toward the
center until the surface is thoroughly
compacted. The surface layer should