Show eliminate guesswork in construction of roads with the determination to have the best roads that its funds will build and to see that its roads are constructed ted in accordance with specifications the north carolina highway department part ment with the help of its chemist R L hns has advanced the science of road construction to the point where all guesswork liess work has been eliminated as to uniform density in pavement construction kven even when the materials are mixed according to specifications and alie surface looks good the mixture which has gone into the road may tall fall throb through gh lack of proper compression mr meets this situation by insisting upon dally daily density tests of the finished pavement from each road project in the state the chemical laboratory of tile the state highway department at receives dally daily a piece of the pavement drilled from the days lay if the laboratory test reveals that the workmen have been lax and there Is insufficient density the work on the project under investigation Is stopped immediately poor construction cannot continue on any road longer than 24 hours after the cause of the trouble Is ascertained the work proceeds tt if necessary the stretch of roadway showing insufficient density ts is torn up uli and gelald the tests sometimes save pave it Is estimated as much as a mile later in road repairs As a result rif of methods such as these north carolina now tins has some of the best bituminous motor roads in the world |