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Murphy Parkway Warehouse <br />December 19, 2016 <br />Job No. 146-618 <br />Page 12 <br />respectively. <br />Shrinkage crack control joints should consist of premolded inserts or sawcut grooves penetrating at least <br />one-fourth of the slab thickness. Control joints in unreinforced pavements should not be spaced farther <br />apart than about 25 times the pavement thickness. Construction cold joints should include dowels to <br />provide load transfer. Table 4shows the recommended dowel bar sizes and spacings. <br />TABLE 4 <br />DOWEL SIZE AND SPACING <br />Pavement <br />Thickness <br />(inches) <br />Dowel <br />Diameter <br />(inches) <br />Dowel <br />Length <br />(inches) <br />Dowel <br />Spacing <br />center to <br />center <br />(inches) <br />6.0 - 6.5 3 /4 16 12 <br />7.0 1 18 12 <br />Where construction cold joints also serve as shrinkage crack control joints, one end of the dowels should <br />be greased and wrapped in plastic to allow horizontal movement. All reinforcement and dowels should <br />be placed at the middepth of the slab. <br />Where the slab edges are not confined such as adjacent to lower unpaved areas, the outer slab sections <br />of large pavement areas may tend to spread laterally towards the free edge. For unreinforced pavements <br />we recommend non-crack control construction cold joints parallel to and within 25 feet of the free edge <br />include tie bars to hold joints closed. Tie bars should be No. 4 bars at least 21 inches long and spaced <br />on 20 inch centers. Any crack control joints, including sawcut types and construction joints, parallel to <br />and within 25 feet of the free edge should include dowels across the joint. Dowel sizes and spacings <br />should be in accordance with the above recommendations. <br />LIMITATIONS <br />This report necessarily assumes uniform variation of soils between borings. Our recommendations are <br />based upon this assumed uniformity and the information provided regarding the proposed construction. <br />If unusual conditions are encountered during construction, the contractor or his representative should <br />notify this firm immediately so that alternate written recommendations can be made. <br />This report is applicable only to the proposed construction, as described herein, and should not be <br />utilized for design or construction on any other site.