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<br />0024~5 <br /> <br />Durango Pumoing Plant - Stage I <br /> <br />~ <br /> <br />5. <br /> <br />Check magnitude of surface irregularities of formwork and finished surfaces to <br />ensure that surfaces are within specified tolerances. <br /> <br />G. Surface Tolerances: <br /> <br />Table 03300F - Surface Tolerances <br /> <br />Concrete surface Maximum allowable surface <br /> irregularity tolerance <br /> Abrupt Gradual <br />T1 1 inch 1/4 inch/inch <br />T2 1/2 inch 1/8 inch/inch <br />T3 1/4 inch 1/16 inch/inch <br />T4 1/8 inch 1/32 inch/inch <br />T4A 1/16 inch 1/64 inch/inch <br />T5 1/32 inch 1/120 inch/inch <br /> <br />H. Repair of Hardened Concrete Not Within Specified Tolerances: <br /> <br />I. Repair hardened concrete which is not within specified tolerances to bring it <br />within those tolerances in accordance with USBR M-47. <br /> <br />( <br /> <br />2. <br /> <br />Perform repair after consultation with a Government inspector regarding method <br />of repair. Notify COR as to time when repair will be performed. <br /> <br />Repair concrete which will be exposed to view in a manner which will result in a <br />concrete surface with uniform appearance. <br /> <br />a. When grinding surfaces exposed to view, limit depth of grinding such that <br />no aggregate particles are exposed more than 1/16 inch in cross section at <br />finished surface. <br /> <br />b. Where grinding has caused or will cause exposure of aggregate particles <br />greater than 1/16 inch in cross section at finished surface, repair concrete <br />by excavating and replacing concrete. <br /> <br />3. <br /> <br />I. Field Verification of Surface Tolerances: <br /> <br />I. Determine compliance of a surface with specified surface tolerances. <br /> <br />2. Evaluate surface roughness. <br /> <br />a. Measure roughness height or depth and check for compliance with values <br />specified in Table 03300A - Deviations from Specified Lines, Grades, and <br />Dimensions and Table 03300B - Surface Tolerances. <br /> <br />b. When measured height or depth of roughness is less than value in abrupt <br />tolerance specification and height or depth of roughness does not cause <br />structure to exceed any applicable value specified in Table 03300A _ <br /> <br />Cast-in-Place Concrete <br />03300 - 41 <br />