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No. 388

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MEADOW-PATCH® 20

Fast Setting, General Purpose Cementitious Repair Mortar

DESCRIPTION
MEADOW-PATCH 20 is a one component, cementitious, fast setting restoration/repair mortar. This product has a light gray color and is designed for vertical, overhead and horizontal applications. This fast setting, low slump repair mortar may be troweled, shaped, molded and shaved before taking a final set. MEADOW-PATCH 20 is an excellent patching solution for difficult vertical and overhead applications without using expensive forming techniques.

USES
MEADOW-PATCH 20 is easy to mix and apply. This fast-setting, low slump mortar is designed to minimize downtime. Because of its versatility, MEADOW-PATCH 20 can be used vertically, horizontally or overhead. Whether the installation is interior or exterior, MEADOW-PATCH 20 is an excellent choice for fast repairs above grade, below grade or on grade. Typical applications include repairs to curb and gutters, precast concrete elements, tie-rod holes, concrete pipe, columns, beams or any other general-purpose repair.

TECHNICAL DATA

Set times per ASTM C191*	Compressive strength per ASTM C 109
Initial 8-12 minutes	@ 1 day	3,000 psi (20.7 Mpa)
Final 15-20 minutes	@28 days	6,500 psi (44.8 Mpa)
*For jobs requiring a faster set time, the use of MEADOW-PATCH® 5 from W. R. MEADOWS is recommended.

FEATURES AND BENEFITS

• Low slump design for easy molding and shaping/No forms needed.
• May be feathered edged/Tenacious bond/
• May be used vertically, horizontally or overhead/Highly versatile.
• Excellent freeze-thaw characteristics/Long term repair stability.
• Fast setting/Increases turn around time.
• High suitability for pre-cast and cast-in-place concrete patching.
• Light gray in color.
• Designed to aesthetically blend with typical concrete.
• Suitable for concrete pipe construction work.

PACKAGING
50 lb. (22.7 kg) bag

SHELF LIFE
1 year when left in original, unopened packaging and stored indoors.

COVERAGE
MEADOW-PATCH 20 yield per 50 lb. bag is 0.45 cu. ft. (0.013 cu. m.)

FOR BEST PERFORMANCE

• MEADOW-PATCH 20 is recommended for concrete repairs only.
• Not intended to be used as a self-leveling underlayment or topping; MEADOW-PATCH 20 is designed as a trowel down repair mortar.
• Do not apply below 35° F (1.7° C) or above 90° F (32° C) or when rain is imminent.
• Protect from freezing for a minimum 24 hours.
• Do not bridge moving cracks. Extend existing control, construction and expansion joints through MEADOW-PATCH 20.
• For large areas with no control, expansion or construction joints, refer to ACI Guidelines.
• The length-to-width ratio of the repair area should not exceed 2 to 1.
• Do not add any admixtures.
• Exceeding liquid requirements shall result in reduced physical properties.
• Realize that set time will decrease as the product, air, substrate and mixing liquid temperature increases and will increase as the temperature decreases.
• For jobs requiring a faster set time, the use of MEADOW-PATCH 5 from W. R. MEADOWS is recommended.
• Featheredging may result in reduced durability and performance.
• Maximum application thickness should not exceed 2" (51 mm) when applied neat.
• Protect from conditions that may cause early water loss such as: wind, low humidity, high temperature and direct sunlight. Early water loss is also amplified in thin applications.
• Failure to follow industry standard practices may result in decreased material performance.
• Proper application is the responsibility of the user. Field visits by W. R. MEADOWS personnel are for the purpose of making technical recommendations only, and are not to supervise or provide quality control on the job-site.

SURFACE PREPARATION
Perform surface preparation in accordance with ICRI Technical Guidelines No. 03730. Mechanically abrade existing substrate to remove all unsound concrete, but do not use excessive force, which may cause micro-fracturing. Substrate must be structurally sound and free of any contaminant that will adversely affect bond. Prepared surface must be dust-free and have sufficient profile to ensure adequate mechanical lock.

Completely expose all reinforcing steel, ensuring a minimum clearance of ¾" behind reinforcing steel. Perform reinforcing steel preparation in accordance with ICRI Technical Guidelines No. 03730.

Pre-soak repair zone, prior to application of slurry coat to a saturated surface dry (SSD) condition and free of standing water. Prime (SSD) substrate with a slurry coat (2 parts MEADOW-PATCH 20 powder to 1 part water or ACRY-LOK™ from W. R. MEADOWS). Allow slurry coat to become tacky prior to application of MEADOW-PATCH 20. Do not allow slurry coat to become tack-free.

MIXING
MEADOW-PATCH 20 requires 3.5-4 quarts (3.30-3.78 L) of potable water per 50 lb. (22.7 kg.) bag. Mix for 3 minutes or until homogenous and until lump-free. Do not mix more material than can be placed and finished within 8-12 minutes at 77° F (25° C). Do not over-mix. MEADOW-PATCH 20 may be mixed with 1.25 gallons (4.7 L) of ACRY-LOK per 50 lb.(22.7 kg) bag to achieve greater durability and enhanced performance.

PLACEMENT
Compact MEADOW-PATCH 20 into properly prepared (SSD) substrate prior to bulk placement. Finish surface with a wood or steel trowel or sponge float. MEADOW-PATCH 20 may be applied up to 2" (51mm). Do not re-temper or over-work product. Follow ACI 305-R89 "Standard on Hot Weather Concreting" or ACI 306-R88 "Standard on Cold Weather Concreting," when applicable.

CURING
Cure MEADOW-PATCH 20 immediately following application using a suitable curing compound from W. R. MEADOWS, or in accordance with ACI 308. W. R. MEADOWS recommends 2250-WHITE or 1130-CLEAR. When conditions exist for rapid early water loss, the use of EVAPRE™, an evaporation retarder from W. R. MEADOWS, is also recommended.

HEALTH AND SAFETY
Avoid direct contact with this product, as it may cause skin and eye irritation. Utilize gloves and safety glasses to minimize direct contact. Avoid inhalation of dust. Inhalation may cause respiratory irritation and/or lung disease (silicosis). This product contains silicon dioxide, which is classified by the IARC and NTP as probably carcinogenic to humans (IARC Group 2A). The use of NIOSH approved respiratory protection is recommended in dusty environments. Refer to Product Material Safety Data Sheet for complete health and safety information.

Keep product out of reach of children.

This material last updated February, 2005.