soft sub-soil. Fig. 19 is a general view of thesubgrade drainage experiments. To quickly determine the wear-resisting qualities ofdifferent kinds of road pavement, an experimental roadsection was built, 400 ft. long and 2 ft. wide, made upof sections of different types of pavement. Concreteside… … Fig. 20 neral view of construction for accelerated wear tests throughout its whole length. All wearing sections exceptthose of concrete were laid on a 2-in. concrete base of1:3:6 mixture. The concrete wearing sections were made6 in. deep. The wearing machine (Fig. 20) consists of 5cast iron wheels…
Automobiles · Aeronautics
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