The Kendrick gazette. [volume] (Kendrick, Idaho) 1892-1968, 1910-02-18

WELL BUILT CONCRETE ROAD.
GFrom Good Roads Magazine, New York;
to do the necessary grading. tiling,
ditching, putting in of manholes, build
Ing shoulders and. in fact, doing all
the work but the actual concreting
Ninety-eight cents barrel was paid
for cement and Is cents a yard for
sand. and the prices of limestone and
crushed cobble are shown in the speci-
fication. The average haul was about
two miles. Two thicknesses of three
ply tar paper were used in the three
twenty-five foot sections, the fourth
, section being made half an inch wide
and filled with composition of four
parts soft pitch to one part Trinidad
asphalt, to which was added per cent
of still wax. the whole heated and
A strip of southern pine was also used
as an experimental joint.
The following specifications are those
under which such a road can be con-
structed:
All cement used should be portland ce-
ment of American manufacture. No more
than per cent of the cement should fail
to pass through a No. 100 sieve nor more
than 25 per cent should fail to pass
through a No. 200 sieve, and it should
stand a test of $50 pounds per square inch
tensile strain when made into briquets
and exposed in air until final set and the
balance of twenty-four hours immersed in
water. One day in air and six DAYS in
water should show tensile strength of
at least 450 pounds. One day in air and
twenty-seven days in water should show
tensile strength of at least $50 pounds,
and when mixed in proportions by weight
of one of cement to three of sand and ex-
posed in air one day and in water six
days it should stand tensile strain of at
least $50 pounds and in twenty-eght days
strain of at least 200 pounds per square
inch.
Sand used in making concrete should be
clean, dry, crushed quartz, trap rock,
granite or we'll graded bank lake or river
sand, passing a No. 20 sieve of No. %
wire, and be SO graded as to contain fine
and coarse particles of the same grade Of
material. the coarse particles to predom-
mate.
the following prices per ton, which prices
represent the actual cost Of the stone laid
down: Two inch, $3.50 per ton; chips, 81. 80
per ton; screenings. 81 per ton.
In case of hard stone. weights should be
computed by measurement on the basis
inch stone. 200 pounds per cubic yard
for chips and $500 pounds per cubic yard
for screenings
Concrete for the first course should con-
sist of one part of cement, two parts Of
sand and five parts of broken limestone
and for the second course one part Of ce-
ment, two parts Of sand and three parts
of hard stone, evenly mixed.
In placing the concrete in position in
the construction Of the pavement the men
should place the concrete where directed
. and SO as to keep the different layers of q
uniform thickness. Each layer should be
we'll tamped with an approved tamper
and as directed by the engineer.
The second course must be laid within
twenty minutes after the first course is
completed and placed and tamped same as
the first course. And at night or at any
other time when the work is discontinued
all the work of both layers should be COM
pleted up to common expansion joint.
In other words, no section of pavement
should be allowed to be left unfinished for
longer period of time than twenty min
uteS II work thereon has been started.
After the second course of concrete is
laid and until it has thoroughly set it
should be protected from the sun by a
canvas or other suitable covering.
When the concrete is sufficiently hard to
warrant, this covering should be removed
and the concrete covered with layer of
sand or gravel about inch in depth
and sprinkled and kept damp to prevent
the surface of the concrete from drying
out too rapidly, which covering should be
left on the concrete for a period of seven
days.
Expansion joints should be placed in
said pavement every twenty-five feet by
actual measurement. such joints TO be
made by placing in position a half
inch thick strip of wood tsouthern pine)
of the same width as the thickness Of the
road metal and cut so as to conform to