CCP 05-11-1992 - Laserfiche WebLink

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roadway that would provide more benefit than an overlay, but at less cost than complete . reconstruction. Ramsey County has been very aggressive in construeting this type of project and is encouraged by results of projects completed in the last few years. The construction of a cold in-place recycling project on Dunlap Street would consist of a four step process. The first step would be to pulverize the existing pavement, destroying the existing crack patterns. This would reduce the amount of reflective cracking that would occur if the street were simply overlaid. The second step would be to grade the pulverized surface to provide a standard street eross-section, typiea1ly a 2 % crown. During this step, additional asphalt emulsion is added to the pulverized bituminous material. The amount of asphalt emulsion to be added would be detennined by laboratory testing of the existing pavement. The third step is to compact the pulverized material by standard mechanical methods to establish a roadway with a unifonn cross section. The fourth and final step of the cm process is to place a two to four inch bituminous . overlay over the entire roadway, much in the same manner as the City's pavement maintenance projects in the past two years. This overlay is placed approximately one week after the final completion of the fourth step. The thickness of this overlay would be detennined based on the heavy truck traffic volumes. According to Mr. Schaeht, the benefits of the cm program include the ability to remove existing cracks, surface rutting, utility trench settlements and potholes which may reflect through overlay - if not corrected. These are the benefits which would not be realized if the second option of patching the existing roadway followed by an overlay was constructed. Deficient or excessive road crowns can also be corrected. . 6