540.3(e) 540.3(l) indicated in the plans as specified in Section 492. Instead of replacing unsound pavement as specified in Section 492.3(c) with asphalt materials, replace with Class AA Cement Concrete in conjunction with the placement of the concrete overlay. Saw cutting and chipping with pneumatic hammers may be used to remove areas inaccessible by a milling machine. Clean and f ill in cracks greater than 3/4 inches with non -shrink grout or other material approved by the Department which will enable bond to the concrete overlay before pavement surface cleaning . No standing waters hould remain on the surface after the milling operation. If standing water occurs, immediately provide measures, acceptable to the Department, to drain the water from the milled surface. Completely clean the milled pavement surface to completely remove all loose debris . Protect the cleaned and prepared surface from oil or grease drippings from compressors, concrete trucks, spreaders, pavers, etc. Remove all deleterious materials before overlaying. Conduct final cleaning of the surface no more than 30 minutes before the placement of the concrete overlay to remove loose material and debris . If using a compressed air stream , ensure that it is free of oil, moisture, and other potential contaminants, and that has a minimum pressure of 100 pounds per square inch measured at the source. Immediately before placing the concrete overlay, ensure the asphalt surface is less than 1 20F. Fog - misting , protective covers or blankets will be allowed to achieve the proper condition of the surface , however, do not allow any standing water or moisture to remain on the pavement surface.
is indicated, develop a joint layout plan to be accepted by the Department and lay out joints before placement of concrete. Avoid placing longitudinal joints in the wheel paths. In general, maximum panel dimensions should not exceed 18 times the concrete overlay thickness, and the length of the longer panel dimension divided by the shorter panel dimensio n should not exceed 1.5. The Representative may allow or require slight deviations from nominal panel dimensions to match joints in adjacent pavement or structures, or to avoid the construction of panels with dimensions or shapes that would otherwise be subject to premature cracking . Sawing is the only acceptable technique for creating concrete overlay joints. Saw joints as soon as concrete has sufficiently hardened to allow sawing without excessive raveling resulting from the sawing operation and to prevent ra