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Smith, Robert (ed.) / The Wisconsin engineer
Vol. 70, No. 6 (March 1966)

Rinehardt, Greg
The use of soil-cement for airport runways,   pp. 18-27


Page 23


Fig. 7-Mechanical spreader for bulk
        cement (from PCA)
spread on the pulverized runway
by mechanical spreader or by
hand. The rotary mixer is then
passed over it to mix the cement
and soil. Water is then added by
a distributor or a spray bar on the
rotary mixer as it makes its next
pass. The water is added slowly
and several passes are necessary
before the water content is up to
optimum moisture. Several more
passes are then made with the ro-
tary mixer until the soil-cement is
thoroughly mixed to the full depth
of processing.
   Fig. 8-Flat type traveling mixer
           Compaction
  When the soil, cement, and
water have been mixed and spread
uniformly over the runway, either
by the hand method or by travel-
ing mixer, the soil-cement should
be compacted to maximum density
immediately. Compaction of most
soil-cement is accomplished with
sheepsfoot rollers such as the one
shown in Fig. 10. Some soils re-
quire special compaction equip-
ment such as plate vibratory com-
pactors or heavy pneumatic-tired
rollers.
  If the surface shows a graying
appearance  during compaction,
water should be lightly applied.
            Finishing
  Methods of finishing the soil-
cement surface vary with the type
MARCH, 1966
Fig. 9-Multiple-pass rotary mixer (from PCA)
Fig. 10-Compaction with a sheepsfoot roller (from PCA)
Fig. 11-Steel-wheel roller (from PCA)
23


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