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of the PCC and CTB or ATB. <br />3. Where the replacement PCC. on the outside edge of an alley abuts Asphalt Cement Concrete <br />(AC), a minimum of 24 inches of AC shall be removed to allow sufficient room for the <br />placement of the alley concrete forms and proper compaction of asphalt restoration. Where <br />the alley outside edge abutting material is PCC, a full length expansion joint shall be placed. <br />4. Steel reinforcement, which is required to be used in all PCC street, alley and driveway utility <br />trench patches, shall be No. 4 bar 24 inches on center in both the longitudinal and traverse <br />directions. A minimum of 2 parallel bars in each direction shall be used. Except at existing <br />expansion j oints, the new patch shall be tied into the existing pavement by fully inserting the <br />reinforced steel into drilled %2 inch diameter by 3 inch deep holes in the adjoining existing <br />pavement. Splices in the reinforced steel required to be made shall have an overlap of at <br />least 12 inches. <br />5. Utility trenches patched with PCC shall be kept free of traffic or other detrimental trespass <br />through use of suitable barriers and other traffic control devices for a minimum period of 7 <br />days. An alternative using 9.0 sacks of portland cement per cubic yard of concrete allows <br />the traffic to be returned after a minimum period of 3 days. In no case shall vehicle trespass <br />occur on PCC streets until design strength is achieved. <br />6. Pavement cuts encountering PCC overlaid by asphalt concrete may be replaced by full depth <br />asphalt concrete. <br />7. Internal vibration shall be used to consolidate PCC which is being placed in depths greater <br />than 7 inches. <br />8. Joints in PCC pavement will be referred to as contraction, construction (cold), dummy, or <br />isolation (expansion). Any of these may be transverse or longitudinal. All joints and joint <br />.material or filler shall extend to pavement edge or to each other. <br />All joints shall be constructed normal to the surface of the pavement. Joints shall not vary <br />from inspector specified line by more than'/4 inch. <br />Transverse contraction joints shall be spaced at equal distance between joints that are equal <br />to the width of the structure (square) and as required to prevent cracking. In addition, <br />transverse contraction joints in pavement shall align with joints in curb and with structures. <br />Separation between transverse joints shall not exceed 15 feet. Joints to be saw cut shall be <br />cut with a waterless (dry) saw to a minimum depth of 1 % inches or '/4 of the depth of <br />concrete which ever is less. The saw cut shall be performed as soon as the concrete has set <br />enough to permit sawing without tearing and raveling and prior to any uncontrolled cracking. <br />Utility & R/W Pernut Manual <br />Exhibit A - 32 <br />C:\WINDOWS\Temporary Internet Files\OLKB202\03rowrlexa.wpd -Manual (03ROWR~I).WPD(I1/07103) <br />