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MINING APPLICATIONS with BULK Rapid Set® Cement
SUMMARY INSTRUCTIONS:
1. Sound concrete with a good profile
2. Minimum 2” repair thickness
3. Clean concrete
4. Saturated, Surface Dry (SSD) concrete
5. Mix per manufacturer’s instructions
6. Press material firmly into place
7. Finish quickly
8. Wet cure for 1 hour or until final set, whichever is longer
9. Clean equipment and surrounding area immediately
10. See Full Instructions below for details
FULL INSTRUCTIONS:
SURFACE PREPARATION:
1. Remove a minimum of 1/16 inch from the application surface.
2. Concrete must be free of materials such as paint, oil, curing compound, bond breaker, or any material that will inhibit bonding. Mechanically remove loose, unsound, contaminated concrete.
3. The perimeter of the area to be repaired shall be sawcut or chipped perpendicular to the surface to a minimum depth of 2 inches. Do NOT cut or damage reinforcing steel.
4. Clean reinforcing steel by sandblasting or other mechanical means to achieve a white metal finish.
5. Thoroughly clean extraneous material such as dirt, loose chips, and dust from concrete surface. If compressed air is used, it shall be free of oil.
6. Concrete surface shall be saturated with potable water. Standing water shall be removed from surface to achieve a saturated-surface-dry (SSD) condition.
MIXING:
1. Organize personnel and equipment before mixing.
2. Mix Rapid Set® Cement, sand, stone, water, and admixtures (if required) in ready mix truck or mobile mixer (volumetric mixer).
3. Bring the mix to a slump of 6 inches ± 1 inch.
4. Control the mixed temperature by protecting the cement and the aggregates from temperature extremes, by using hot or cold mix water, or by other methods.
5. Do NOT re-temper.
PLACEMENT:
1. Place repair material immediately after mixing.
2. Place repair material only if surface and ambient temperatures are above 45°F and rising.
3. Place the mixed repair material on the saturated-surface-dry (SSD) substrate.
4. Work the mixed repair material firmly into all application surfaces to achieve good bond. Consolidate to remove air voids.
5. Do NOT wait for bleed water. Apply final finish as soon as possible.
CURING:
1. Begin water cure when repair area begins to lose its moist sheen and keep continuously wet for 1 hour or until final set, whichever is longer.
CLEAN UP:
1. Maintain a clean, orderly work area.
2. Clean excess material from surrounding areas and equipment immediately.
3. Protect adjacent surfaces that may be damaged by cement mixture with drop cloths, waterproof paper, or other means to maintain surfaces free of material splashes, water, and debris.