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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
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
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.
