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15-12 Repairing: The contractor shall submit repair procedures, including a <br /> material list, when required by the Engineer. <br /> <br />Subsequent to placement of the backfill, the contractor and the engineer <br />shall reinspect the inside of the pipe. Cracks less than 0.01 inch in <br />width shall be painted with a cement paste. Transverse cracks 0.01 inch <br />or more in width and less than 12 inches in length shall be repaired. <br />Tile method of repair and the material used shall be approved by the <br />Engineer. <br /> <br />Longitudinal cracks exceeding 0.01 inch in width and 12 inches or <br />greater in length shall be cause for rejection of the cracked pipe. If <br />such cracks occur intermittently in more than 25 percent of the length <br />of any reach of pipe, the entire reach is subject to rejection. Reaches <br />subject to rejection shall either be removed and replaced or shall be <br />strengthened in a manner app.roved by the Engineer. <br /> <br />15-13 <br /> <br />15-14 <br /> <br />Backfill: Backfill shall conform to the applicable provisions of the <br />City~-~ Standard Specs or Section 13 .of these specifications as <br />applicable. Backfill shall not be placed until the pipe attains <br />suitable strength. <br /> <br />Load Bearing: All test loads for load bearing test shall be calculated <br />based on pipe being constructed in streets. <br /> <br />15-15 <br /> <br />Inspection: For construction of cast-in-place pipe, a full time <br />inspector, employed by a testing lab and under direct supervision of a <br />Registered Civil Engineer, will be required for continuous inspection of <br />the construction of the pipe. The inspector shall be provided by an <br />independent testing lab at the contractor's expense. The inspector is <br />subject to Engineers' approval. <br /> <br />Cast-in-place pipe shall be constructed only in the presence of the <br />inspector. The inspector shall remain on job site until ail initial <br />concrete curing operations have been accomplished. <br /> <br />The inspector shall perform slump test at the rate of one for each set <br />of three test cylinders and as required by the Engineer. Slump tests <br />shall be in accordance with ASTM C 143. <br /> <br />Concrete cylinders shall be molded and cured in accordance with ASTM C <br />31 and tested in accordance with ASTM C 39, except as modified herein. <br /> <br />The responsibilities of the inspector as relative to concrete cylinders <br />are as follows: <br /> <br />1. The inspector will mold, cure and test concrete cylinders to <br /> determine compliance with the 28-day strength requirement. <br /> <br />2. The inspector shall prepare and test six cylinders from the first <br /> 25 cubic yards of concrete, three cylinders from the next 25 cubic <br /> yards, and at the discretion of the engineer three cylinders per <br /> 25 cubic yards of additional concrete. There shall be at least <br /> three cylinders made each day. The inspector may make additional <br /> cylinders as it deems necessary. <br /> <br />CDS.1.14 15-5 <br /> <br /> <br />