Facts & Figures Book - KPI-JCI

DEFINITIONS AND TERMS (Continued)plane type, designed to establish position of any crackcaused by contraction, while providing no space for expansionof pavement beyond original length.Corrugations—Regular transverse undulation in surface ofpavement consisting of alternate valleys and crests.Cracks—Approximately vertical cleavage due to naturalcauses or traffic action.Crazing—Pattern cracking extending only through surfacelayer, a result of more drying shrinkage in surface than interiorof plastic concrete.“D” Lines—Disintegration characterized by successiveformation of series of fine cracks at rather close intervals parallelingedges, joints and cracks, and usually curving acrossslab corners. Initial cracks forming very close to slab edgeand additional cracks progressively developing, ordinarilyfilled with calcareous deposit.Dense and Open Graded Aggregates—Dense applies tograded mineral aggregate containing sufficient dust or mineralfiller to reduce all void spaces in compacted aggregateto exceedingly small diameters approximating size of voids infiller itself, may be either coarse or fine graded; open appliesto graded mineral aggregate containing no mineral filler or solittle that void spaces in compacted aggregate are relativelylarge.Dewater—To remove water by pumping, drainage, or evaporation,or a dewatering screw.Disintegration—Deterioration into small fragments from anycause.Distortion—Any deviation of pavement surface from originalshape.Expansion Joint—Joint permitting pavement to expand inlength.Faulting—Differential vertical displacement of slabs adjacentto joint or crack.Flume—An open conduit of wood, concrete or metal.Gradation—Sieve analysis of aggregates, a general term todescribe the aggregate composition of a mix.242