Third biennial report of the Oregon State Highway Commission : $b covering the period December 1st, 1916 to November 30th, 1918Benson, Simon
History
Third biennial report of the Oregon State Highway Commission : $b covering the period December 1st, 1916 to November 30th, 1918
Benson, Simon
Highway engineering -- Oregon -- History; Water resources development -- Systems engineering -- Oregon -- History
The coarse aggregate consisted of crushed stone ranging from ¼ inch to
2½ inches. For the fine aggregate, both Columbia River and Willamette
River sand was used. The stone was crushed from a quarry operated by the
State on Deer Creek which was near the center of the job and consisted
of an altered basalt of rather coarse texture. The quality of this
stone is not equal to the true basalt; but tests made by the Oregon
Agricultural College showed that it was of good quality. The average
haul on this material was .6 of a mile.
Crushing was begun early in March and 1200 cubic yards of material
stored in a stock pile which was rehandled later by means of an
automatic loader purchased by the State Highway Department for this
class of work. The output of the crusher was insufficient to keep the
mixer running and by means of this stock pile it was possible to keep
the material coming on to the road steadily and finish the job in a
minimum length of time and with the least inconvenience to traffic.
In this connection the experience on this job shows the advisability of
using a stock pile of material to draw from in case of emergencies. When
this is done the work is allowed to go ahead steadily, although a
breakdown at the crusher may occur. The saving made by a steady run more
than offsets the cost of rehandling the material, which is done very
reasonably by the use of machinery.
The sand was shipped to Ballston and Sheridan by railroad, approximately
equal amounts being shipped to both places and was so divided as to get
a minimum length of haul on this material. The average haul was 3.5
miles. At Ballston the sand was unloaded from the cars into bunkers,
which dumped directly into trucks, while at Sheridan no bunkers were
available and the material was unloaded on the ground and rehandled by
means of an automatic loader. No delay was caused by car shortage as we
used our stock pile at Sheridan in emergencies. All the material was
hauled and handled by means of trucks, two of which belonged to the
State Highway Department, others working on a yardage basis.
The pavement, after being struck off, was finished by the roller and
belt method; being rolled from two to four times, according to the
condition of the concrete and later belted with eight and ten inch
belts. The eight inch belt being used first. By using this method of
finishing, we were able to eliminate the use of skilled labor, which
showed a material saving in the finishing item, and at the same time
secured a very satisfactory surface.
As soon as sufficiently hardened, the pavement was covered with earth
from the roadside and kept moist for at least one week while curing. The
earth covering was later removed by means of an ordinary road grader,
when ready to be opened for traffic, the elastite joints being trimmed
at the same operation.
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