. Automotive industries . n the soil is saturated. In the tests of the Class B truck on the Camp Hum-phreys Road above referred to, it was found that thesoil pressure under the 8-in. concrete road slab figuredout to lb. per sq. in. By comparing this value withthe 2 lb. per sq. in. minimum bearing value of the adobesoil in the saturated condition, it will be seen that diffi-culties must be encountered in building roads for heavymotor traffic in some sections of the country. But evenadobe soil will support heavy pressure when reasonablydry, which emphasizes the importance of proper drain-age
. Automotive industries . n the soil is saturated. In the tests of the Class B truck on the Camp Hum-phreys Road above referred to, it was found that thesoil pressure under the 8-in. concrete road slab figuredout to lb. per sq. in. By comparing this value withthe 2 lb. per sq. in. minimum bearing value of the adobesoil in the saturated condition, it will be seen that diffi-culties must be encountered in building roads for heavymotor traffic in some sections of the country. But evenadobe soil will support heavy pressure when reasonablydry, which emphasizes the importance of proper drain-age. This is further confirmed by the fact that citypavements of small depth stand up so well under theheaviest kind of traffic, the only explanation being thatthe subsoil here is well drained and never becomes sat-urated. Fine grained and very plastic soils when sat-urated are apt to give considerable trouble, while coarse Fig. 17—Bearing values ofadobe soil with differentmoisture contents and dif-ferent initial pressures. cV 40 SO SO /U> 130 H4 #D /SO so 40 60 so /oo tx> ah> «o /so 0 ao 40 <& so /ao / so *x> /&> /*» a& &> April 28, 1921 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE 905 -Ai4r~i-r-\—i-o—| 7-o- -I ,■<■ i ^**/ , i, © NATURAL EA*TH SUBGRADE
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
