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beams, <br />the Contractor's expense, load tests on any one of the slabs, <br />and columns in which such concrete was used. Test need not be <br />' <br />made until concrete has aged 60 days. <br />C. <br />Slabs or beams, under load test, shall be loaded with their own <br />weights plus a super- imposed load of 2 times design live load. The <br />load shall be applied uniformly over portion being tested in approved <br />manner, and left in position for 24 hours. The structure shall be <br />considered satisfactory if deflection "D" in feet, at end of 24 -hour <br />period does not exceed value: <br />D equals 0.001 (L x L) /t <br />in which "L" is span in feet, "t" is depth of slab or beam in inches. <br />D. <br />If deflection exceeds "D" in the above formula, the concrete shall be <br />considered faulty unless within 24 hours after removal of the load, <br />slab or beam under test recovers at least 75% of observed deflection. <br />E. <br />Should the strength of test cylinders fall below 60% of the required <br />minimum 28 -day strength, the concrete shall be rejected and shall be <br />' <br />removed and replaced. <br />3.11 PATCHING AND REPAIRS <br />A. <br />It is the intent of these Specifications to require that forms, mixture of <br />concrete and workmanship shall be such that concrete surfaces, when <br />exposed, will require minimal finishing as specified in Paragraph 3.05 <br />above. <br />t <br />B. <br />As soon as the forms have been stripped and the concrete surfaces <br />left by <br />exposed, fins and other projections shall be removed, recesses <br />the removal of form ties (except where ties are left in place during <br />sandblasting) shall be filled and surface defects which do not impair <br />structural strength shall be repaired. Clean all exposed concrete <br />surfaces and adjoining work stained by leakage of concrete, to <br />' <br />approval of the Engineer. <br />C. <br />Immediately after removal of forms remove plugs and break off metal <br />' <br />ties as required by Paragraph 3.06. Holes are then to be promptly <br />filled upon stripping as follows: Moisten the hole with water, followed <br />by a 1/16 inch brush coat of neat cement slurry mixed to the <br />' <br />consistency of a heavy paste. Immediately plug the holes with 1 1.5 <br />mixture of cement and concrete sand mixer slightly damp to the tough <br />' <br />(just short of "balling "). Hammer the grout into the hole until dense, <br />and an excess of paste appears on the surface in the form of a spider <br />web. Trowel smooth with heavy pressure. Avoid burnishing. <br />' <br />03300 -15 03- 3148.A -R <br />09/03 <br />