Rapid-Set Patching Compound

03 01 30.71
DATA SHEET 3900-820

Specification

820 Rapid-Set Patching Compound

DESCRIPTION
820 Rapid-Set Patching Compound is a ready-to-use, fast-hardening, high strength concrete repairing compound. Restoring concrete structures subject to corrosive attack from the sea and heavy weathering revealed the exceptional bond and durability provided by the formulation. Millions of pounds have been used yearly by private contractors and government agencies. 820 Rapid-Set Patching Compound is also available in a Sulfate Resistant version.

USES
820 Rapid-Set Patching Compound applications include the repair of any masonry or concrete structure in need of restoration
Summer Grade
For use in fairly warm summer-like temperatures 50°F (10°C) and over.

Winter Grade
For use either above water or underwater in cold conditions. (Although tests show 820 Winter Grade Rapid-Set Patching Compound will set-up and harden at below freezing temperatures, it is safer to bring area to be repaired up to at least 32°F (0°C).

Limitation
820 Winter Grade Rapid-Set Patching Compound will set very quickly if used in warm summer weather.

Packaging
25 Kg multi-all paper bags

Preparatory Work
Insure that rigid foam insulation is securely fastened to concrete. The surface shall be firm and free of loose particles, grease, oil and other foreign matter. Apply self-sticking fiberglass tape over joints between insulation panels, to all outside corners, over fastener heads and damaged insulation areas.

Safety Precautions
Contains Portland cement. Avoid eye contact or prolonged contact with skin.

Working Characteristics
Coverage: Approximately 75 ft² (9.3 m²) per 25 kg pail of 825 Parge-All. On rougher surfaces, or if a thicker, highly textured surface is desired, coverage will be reduced.

PHYSICAL PROPERTIES
Pot Life	Mix and place within 5 minutes. Mix no more than 2 bags at one time.
Set Time	ASTM C807 - at room temperature using trowelable mix.

	Summer Grade	S.R.	Winter Grade	S.R.
Initial	10-12 minutes	15-17 minutes	5-8 minutes	0-13 minutes
Final	15-20 minutes	20-25 minutes	8-12 minutes	5-17 minutes

Compressive Strength ASTM C109 750 psi (5.3 MPa) 24 hours 7 days 28 days	2000 psi (14 MPa) 5500 psi (38 MPa) 7700 psi (53 MPa)
Bond Strength After 7 days (ASTM C666 - 300 cycles) ORF	Shear Bond - ORF Method 1480 psi (10.2 MPa) Freeze-Thaw

Resistance: Very good resistance –comparable to well-designed, air entrained, Portland cement concrete.

Extending: When repairing exceptionally large or deep areas, up to 50 lb (22.7 kg) of crushed stone or pea gravel may be added per bag.

Yield: One cubic foot requires a little over 2 bags. Using crushed stone or pea gravel one ft3 requires a little over 1 bag.

Acrylic Latex Intralok Bonding Agent should be used as the mixing liquid for repair of industrial floors subject to heavy loading or where normal curing conditions are unsatisfactory.

Installation Instructions

Apply 820 Rapid-Set Patching Compound in a stiff no slump consistency, so that forms or other types of containers are not necessary.
Use about 3 - 3 ½ quarts (3.5 - 4 litres) of water per bag.
Mix for approximately 2 minutes and place without delay.
The surface to be repaired should be rough, clean and wetted with water prior to application.
For use on smooth surfaces and for featheredge patching, Intralok Bonding Agent is recommended.
Do not mix up more than can be effectively placed in 5 minutes, especially in warm weather.
Do not attempt to re-temper. After placing, keep damp for an hour or apply a curing compound.
For applications use straight from the bag with water only.
For exceptionally large or deep areas, crushed stone, trap rock, or pea gravel should be added up to 100% by volume.
When adding these aggregates always dry mix the ingredients first.
Add water and mix to LOW SLUMP consistency.
Do not over-water.
MIX AND PLACE WITHIN 5 MINUTES.

2009-03

warranty