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<br />002430 <br /> <br />Durango Pumping Plant - Stage I <br /> <br />Amendment 001 <br /> <br />I. Uniformly consolidate concrete by vibration. Establish a pattern of vibrator <br />insertions not to exceed one and one-halftimes the radius of action or such that <br />the area affected by the vibrator overlaps the adjacent, just-vibrated area by a few <br />inches. <br /> <br />2. Select proper size vibrator according to ACI 309.R Guide for Consolidation of <br />Concrete. <br /> <br />3. Remove undesirable air voids from the concrete, including the air voids trapped <br />against forms and construction joints. <br /> <br />4. Produce concrete placements without rock pockets and honeycomb areas. <br /> <br />5. Consolidate snugly against all surfaces of forms, construction joints, and <br />embedments. <br /> <br />6. Adequately consolidate concrete adjacent to construction joints and sloping <br />surfaces. <br /> <br />7. After concrete has been deposited, level the mounds or high spots by vibration. <br />Do not move concrete horizontally with vibrators. <br /> <br />8. Consolidate concrete by immersion-type vibrators operated in nearly vertical <br />position. The vibrating head shall penetrate and revibrate the concrete in the <br />upper portion ofthe underlying layer. <br /> <br />9. Exercise care to avoid contact of the vibrating head with embedded items and <br />with formed surfaces which will later be exposed to view. <br /> <br />10. Do not place concrete upon other plastic concrete until the previously placed <br />concrete has been thoroughly consolidated. <br /> <br />1 I. Operate immersion-type vibrators at speeds of at least 7,000 vibrations per minute <br />when immersed in concrete. <br /> <br />12. Replace immediately improperly operating vibrators with acceptable vibrators. <br /> <br />F. Cast-in-Place Colored Architectural Concrete <br /> <br />1. Schedule placement of cast-in-place colored architectural concrete so that all <br />colored concrete is placed within 4 weeks time. <br /> <br />2. Cast-in-place colored concrete shall not use fly ash, unless approved by the <br />Government. <br /> <br />3. Place cast-in-place colored concrete at a slump not to exceed 3 inches at the time <br />of placement. <br /> <br />3.04 FINISHING, PROTECTING, AND CURING <br /> <br />A. Cast-in-Place Colored Architectural Concrete <br /> <br />1. Cast field cured test cylinders to determine the compressive strength of the <br />concrete prior to application of light sand-blast finish. <br /> <br />Cast-in-Place Concrete <br />03300 - 26 <br />