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.
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