Road Making
Page 9
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A Mile a Day
QECONDARY roads can be made at 1.--1 the rate of a mile-a day with one machine at a single pass. claims the maker of the P. and H. single-pass soil stabilizer. Controlled by one man, and travelling under its Own power, the machine does it own digging, pulverizing, blending of admixtures, and applies the liquids and final mixture in one pass.
In the pulverizing operation, a cutting rotor, revolving at high speed, shaves and pulverizes the existing material to an accurate, predetermined, sub-grade depth. The subsequent blending of the pulverized materials, and the dispersing of processing liquids, combined with the violent agitation of the pug mill, are responsible for producing a mix to a desired specification.
Then follows the spreading, which is carried out to a uniform depth and of loose density ready for immediate consolidation. The machine is responsible for what is termed soil stabilization, which has been defined as "a process of giving natural soils enough abrasive resistance and shear strength to accommodate traffic or loads under prevalent weather conditions without detrimental deformation."
The P. and •H. outfit has been designed and built specifically for this work, arid everything necessary for succesrsfully processing a complete range of soils, combinations df them and of aggregates, with or without admixtures
of binding media, have been incorporated in the processing chamber of _the machine.
Films showing the equipment in action were recently shown in London by Benson and Partners, Ltd., GrOsvenor, Gardens House, Victoria, London, S.W.1.