The Hawaiian star. [volume] (Honolulu [Oahu]) 1893-1912, 1908-04-23
WOODEN BLOCKS.
Continued from Page oneJ

All sap wood snail ne excluded, anu
lumber shall have been cut from sound
live trees.
The blocks are to be treated through
out with an anti-ceptic and waterproof
mixture, rs per cent of which shall be
creosote oil of coal-tar, conforming TO
the specifications hereinafter set forth.
All parts of each individual block shall
be thoroughly treated, and lot less than
twenty pounds of the mixture per cubic
foot shall be injected.
In preparing the blocks to receive
the creosote mixture, they shall be
placed in an air-tight cylinder, in
which dry heat, or heat produced by
superheated steam, is maintained and
raised to a temperature of 215 degrees
Fahrenheit, for one hour, for the pur-
pose of eXpelling the moisture; the heat
is then to be increased until it has
reached 2S5 degrees Fahrenheit, this
heat being maintained for a period OF
three hours, or until the block is com
pletely sterilized. Application of heat
is then to be stopped and the tempera-
ture of the cylinder allowed to fall for
one hour, or until same has been re-
duced to $50 degrees. A vacuum is
then to be applied until about 26 de-
grees is reached, and while under this
vacuum the creosote mixture is to be
run into the cylinder at temperature
of from 175 to 260 degrees, after which
! hydraulic pressure of not less than 200
pounds per square inch is to be main
tanned and raised until the individual
blocks are treated throughout.
The creosote oil is to conform to the
following specifications when tested
The gravity at 6S degrees Fahren-
heit shall not be less than 1.12. When
distilled in a retort with the thermo-
meter suspended not less than one inch
above the oil, it shall not lose more
than 35 per cent, up to 315 degrees
Centigrade, and not more than so per
cent up to $40 degrees Centigrade.
| The oil is to be free from adulteration;
it must not be mixed or contain any
! foreign material.
The resin is to be solid resin obtain
ed from pine. 1t is to be reduced to Il
fine dust by grinding and then incor-
porated with the hot creosote oil in
suitable mixing tank until the proper
proportions are secured.
After treatment, the blocks are to
show such waterproof qualities, that,
| of lrin in of q
perature of 100 degrees for period
of twenty-four hours, weighted and
then immersed in clear water for a
period of twenty-four hours and
weighed, the gain on weight is not to
be greater than per cent.
The county shall appoint an inspector
who shall inspect and test the blocks;
he shall reject any that he may con-
slider not in compliance with sections
l. 2 and 8.
LAYING THE WOOD BLOCKS.
Upon the concrete foundation shall
be spread a layer of mortar made OF
one part of Portland cement and three
parts of sand, with sufficient water to
make moderately stin paste. The
mortar shall be thoroughly mixed and
shall be spread in place on the founda-
ton Immediately in advance of the
block laying, to such a thickness that
when the blocks are set and properly
bedded in the mortar their tops shall
conform accurately to the designed
grade and contour of the street. The
concrete foundation shall be cleaned
and swept to remove all eXtraneous mat
ter and shall be thoroughly dampened,
Immediately in advance of placing the
mortar bed. The mortar bed shall be
struck by template to a surface truiy
parallel to the pavement datum.
Upon this mortar bed the blocks shall
be carefully set on end, or with their
fiber vertical, in straight parallel
courses, either perpendicular to the
axis of the street, or at such angle
thereto as the engineer may direct,
The blocks shall be set as closely to-
gether as practicable. After the blocks
are thus set in place, they shall be
rammed with a street rammer weigh
ing not less than 80 pounds, a plank 10
inches wide, 2 inches thick and not
more than 6 feet long laid fiat on the
pavement, being interposed between
the hammer and the blocks and moved
about until the blocks are rammed to
firm seat in the mortar bed and their
tops brought truly to the designated
grade. The ramming shall be COM
pleted before the mortar bed has be-
gun to set, but no ramming shall APP
proach nearer than feet to the edge
of the block setting, except where the
block setting may be interrupted, as
at the end of days work, when all
the blocks then set shall be rammed.
Mortar that may have begun to set be-
fore the blocks are in place and ram
med shall be discarded and replaced
with fresh mortar The top surface OF
the pavement, when finished, shall con