1. Silica Fume Inspection

2. 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

3. 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

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

5. Why Evaporation Retardant ?

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

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

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

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

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

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

12. Questions?