Show definition OF ROAD TERMS list of technical names taken from the program of the canadian good roads congress with the progress of road building there has come into use a number of terms more or less technical but which should be well known the following list Is from the program of the Can canadian adlan good roads congress aggregate the mineral material such as sand gravel shells slag or broken stone or combinations thereof with which the cement or the bituminous material Is mixed to form a mortar or concrete fine aggregate may be considered as the mineral inert material which will pass a one fourth inch screen and coarse aggregate the material which will vili not pass a one fourth lach inch screen binder 1 I 1 A foreign or fine material introduced into the mineral portion of the wearing surface for the purpose of assisting the road material to retain its integrity under stress as well as perhaps to aid la in its first construction 2 the course in a sheet asphalt pavement pa vincnt frequently used between the concrete foundation and the sheet asphalt mixture of graded sand and asphalt cement dond bond the combined action of inertia friction and of the forces ol of adhesion and cohesion which helps the separate particles cles composing a crust or pavement to resist separation under stress mechanical bond Is the bond produced almost wholly in a well built brokel stone macadam road by the interlocking of angular fragments of stone and the subsequent filling of the remaining interstices with the finer particles water bound bonded with the aid of water cement an adhesive substance used for uniting particles of other materials to each other ordinarily applied only to cement rock or to artificially prepared and ground mixtures of limestone and materials sometimes used to d designate es ignate bituminous binder used in bituminous pavements when the expression bituminous cement q v la is understood to be meant cement concrete an intimate mixture t ure of gravel shell slag or broken batone particles with certain pro proportions poT of sand or similar material cement and water made previous to placing course one or more layers of road material spread and compacted cepa fcpa for the formation of the road or pavement courses are usually referred to in the order of their laying as first course second course third course etc also a single row of 0 blocks in a pavement rise in cross section from the lowest to the highest part the finished roadway it may be expressed either as so many laches inches tenths of a foot or as a rate per foot of distance from froin side to tenter center that Is the crown Is four inches or the crown is one halt half inch to the foot |