Silica Fume Inspection

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Presentation transcript:

Silica Fume Inspection

Surface Preparation Initial Clean all repair areas by sandblasting Clean reinforcing and repair Final Clean entire surface by air blasting Flush with water and keep wet for 2hrs before placement Right before placement Blow out water puddles with compressed air

Placing 45-80 deg Evap rate not > 0.10 Brush slurry out in front of lay down using the paste portion and removing aggregate larger than #4

Finishing Vibrate and Rake to ¼” above final grade Vibrate end of deck bulkheads repair areas curb lines Burlap drag Apply evaporation retardant

Why Evaporation Retardant ?

Plastic Shrinkage Cracking Evaporation Rate Exceeds Bleed Rate High Air & Concrete Temps Low Humidity High Winds

Tining Control timing to avoid tearing of surface Grooves from an 1/8”-3/16” deep No overlap

Curing Two applications of PAMS curing compound When set cover with wet burlap and poly sheeting 4 days

Keys to Success Prevent Premature Moisture Loss Night-time placements Fogging Applications Use of Evaporation Retarder Moist Cure blankets

Research Pull-off Test ASTM C 1583 Restrained Ring Test ASTM C 1581 Length Change Prisms ASTM C 157

Future Possibilities ? Based on Research conclusions/recommendations Gradation changes Cementitious content Requiring fogging SRA’s Requiring seals or epoxy overlays

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