310.3(b) 310.3(c) spread and compact by another acceptable method. If base course material is placed on existing pavement as an overlay or build -up, construct in compacted layers. If subgrade or subbase materials become mixed with the base course, remove the mixture; reshape and recompact the subgrade and/or subbase; reconstruct the unsatisfactory base course area. Use calcium chloride only when and as directed.
subbase, or existing pavement as a bed and filler; spread to a depth of 2 inches on subgrade, or 1 inch on subbase or existing pavement. Do not place this initial layer of fine material on wet, frozen, or unsuitable subgrade or subbase.
If the base course is more than 8 inches in compacted depth, construct in two or more layers of approximately equal depth, with no layer less than 4 inches nor more than 8 inches in depth.
unless otherwise specified. In areas inaccessible to spreading equipment, spread material directly from trucks, if allowed . Remove segregated material and replace with well -graded material. Do not spread the material more than the distance completed in an average day's work ahead of choking and compacting, as specified in Section 310.3(c)3 and (c)4, respectively. Test each layer of material for surface irregularities, as specified in Section 310.3(b)2, and correct irregularities before rolling.
to the center. On superelevated curves, begin on the low side and progress to the high side. Install string lines with ample supports, offset along each side to control the elevatio n and depth of the base course. Maintain string lines until the base course is completed and the deficiencies have been corrected. Roll parallel with the roadway centerline, uniformly lap each preceding track, cover the entire surface with the rear wheels, and continue until the material does not creep or wave ahead of the roller wheels. Place red flags at the initial limits of compa cted coarse material completed. The flags will be moved ahead as ad ditional material is compacted. Do not apply filler to the coarse material outside of the flag - marked sections.
uniformly over the surface with spreading equipment, to assure filling voids. In areas inaccessible to equipment,