Show I CONSTRUCTION OF GOOD ROAD Concrete Highway Is Composed oi ot Mixture of Sand Stone Portland Cement and Water f its The concrete road Is composed ofa ol of ola a carefully proportioned mixture of ol J clean hard well graded sand pebbles pebbles peb peb- bles or broken stone Portland cement and water This mixture Is laid upon the to a dept m of 7 inches or more for the entire width of th the road and soon hardens Into a mass massas massas massas as hard as rock The materials are bonded together by the cement so firmly firmly firm firm- ly that it Is Impossible for traffic to loosen or separate the particles For this reason no expensive maintenance is IR required The foundation or Is compacted com corn where the concrete Is to be laid and the roadbed Is drained so that no water will remain under the stab slab writes A. A L. L Pettibone in Dakota Farmer Upon the foundation concrete concrete con con- crete is laid in one or two courses A A. one-course one concrete road consists of ofa ofa ofa a relatively rich concrete mixture throughout A two two course course road consists consists con con- of a somewhat leaner mixture for fora a base with a rhet r rt her het top or wearing course applied before the concrete Inthe In hi hithe the base has begun besun to harden Frequently Frequently Frequently Fre Fre- re-enforcement re in the form of wire fabric or steel rods is embedded in the concrete This assists to prevent prevent pre pro vent cracks in the slab and aids in V V keeping cracks which may form from opening to any appreciable extent The high wearing quality of the concrete concrete concrete con con- crete road rond results from using properly graded clean hard sand and pebbles or crushed rock These must be combIned combined combined com com- with Portland cement in carefully carefully carefully care care- fully measured proportions mixed with witha a a. power-operated power batch mixer to produce produce produce pro pro- duce a stiff plastic consistency then placed upon the foundation and struck truck off oft with a n template or strike board so shaped that the surface of the pavement pavement pavement pave pave- ment will have the desired crown After After After Af Af- ter rolling with a light metal roller to compact the concrete and remove excess water used in mixing the concrete concrete concrete con con- crete is finished by seesawing a section section section sec sec- tion of rubber or canvas belting along r e a An Improved Highway in West the pavement leaving a true even gritty dense surface When sufficiently sufficient sufficIent- ly hardened to prevent pitting or marking the surface is sprinkled with mater arater then covered with 2 inches or or r wore more of moist sand or earth which is kept wet by sprinkling for from ten days to two weeks to prevent the concrete concrete concrete con con- crete from drying out too rapidly Under Under Under Un Un- der no circumstances should a concrete concrete concrete con con- crete road be put in use until it Is 14 V days old and In cool weather a longer lonser time Is necessary This is a brief summary summary summary sum sum- mary of the essentials of the construction construe construe- tion Uon of a concrete road |