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e. Remove 400-grit resin-bonded diamond scratches by grinding with 800-grit resin-bonded <br /> diamonds. <br /> f. Remove 800-grit resin-bonded diamond scratches by grinding with 1500-grit resin-bonded <br /> diamonds. <br /> 6. Apply stain guard: <br /> a. Apply in accordance with manufacturer's published instructions. <br /> b. Apply first coat per manufacturer's recommendation (DO NOT OVER APPLY). <br /> C. Use applicator pad, pre-wetted with stain guard, to pull material out to create a thin film prior <br /> to drying. <br /> d. Remove product completely from areas of over application, as evidenced by surface <br /> streaking, and replace with unused stain guard. <br /> e. Apply second coat of stain guard at all high traffic areas identified on the drawings per <br /> manufacturers instructions. <br /> 7. High speed burnish: <br /> a. After each application of stain guard is dry, burnish surface. <br /> b. Burnish using approved pads, at a slow movement pace using high speed machine with 400 <br /> or 800 grit diamond impregnated pads as required to achieve specified gloss requirements. <br /> C. Burnish with several passes. Make each progressive pass at 90 degrees from previous pass. <br /> d. Burnishing, pad type, and pace of forward movement shall combine to develop a minimum <br /> floor surface temperature of 91-degrees F directly below the burnishing pad as continuously <br /> measured by the operator during installation. <br /> 3.4 FIELD QUALITY CONTROL <br /> A. Inspect completed polished concrete floor system with the 7-Eleven Construction Manager, General <br /> Contractor, and Polished Concrete Installer. <br /> B. Review procedures to correct unacceptable areas of completed polished concrete floor system. <br /> C. Specular Gloss/Reflectance, ASTM D 523: <br /> 1. Perform polishing and burnishing work necessary to produce a Specified Overall Gloss Value <br /> (SOGV) >_ 50 prior to applying protective surface treatment, SOGV>_60 after applying protective <br /> surface treatment, Minimum Local Gloss Value (MLGV)>_40 after applying protective surface <br /> treatment as measured using a Horiba IG-320 60 Degree Gloss Checker. <br /> 2. Gloss shall be considered as a quantitative value that expresses the degree of reflection when light <br /> hits the concrete floor surface. Gloss measurements will be taken independent of ambient lighting <br /> and will be taken within a sealed measurement window located beneath the test unit. <br /> 3. Average shall exceed SOGV>_60. No single measurement shall be less than MLGV>_40. <br /> 3.5 PROTECTION <br /> A. Protect completed polished concrete floor system from damage until Substantial Completion. <br /> 1. Do not allow vehicle and pedestrian traffic on unprotected floor. <br /> 2. Do not allow construction materials, equipment, and tools on unprotected floor. <br /> 3. Prohibit parking of vehicles on concrete slab. <br /> 4. If construction equipment must be used for application, diaper components that might drip oil, <br /> hydraulic fluid, or other liquids. <br /> 5. Carefully protect against tire embedment's (rocks, nails, screws, etc.)that will scratch or pit slab <br /> surface. <br /> 6. Prohibit pipe cutting or threading using machinery on concrete slab. <br /> 7. Prohibit temporary placement and storage of steel members on concrete slab. <br /> 8. Prohibit acids and acidic detergents from contacting concrete surfaces. <br /> 9. Cover concrete floors with drop cloths or use breathable drop cloths during painting. If paint is spilled <br /> on concrete floor, remove paint immediately. <br /> 10. Protect completed polished concrete surface from standing moisture for 72 hours to prevent re- <br /> 033536 <br /> e- <br /> 033536 <br /> 7-Eleven 2-26-2018 <br />