EVAPRE™
EVAPORATION RETARDANT
Description
EVAPRE Evaporation Retardant is
an economical, high-quality, water-based compound. It is specifically
designed to form a thin monomolecular film to reduce rapid moisture
loss from the concrete surfaces prior to curing. EVAPRE provides
a significant aid in producing high-quality concrete flatwork.
Rapid evaporation of water is retarded, slab surface conditions
are normalized, and workers can adhere more closely to established
finishing schedules. EVAPRE is also VOC-compliant.
EVAPRE significantly reduces plastic shrinkage
and cracking, wind crusting, stickiness, and sponginess which
often cause poor and uneven surface texture. These conditions
result when the hydration is more rapid than the movement of bleed
water to the surface. EVAPRE effectively combats and minimizes
the effects of rapid drying conditions such as low humidity, low
dew point, high winds, direct sunlight, hot weather, heated concrete
or placement of concrete in a heated enclosure or interior area
during cold weather. The protective film shield disappears as
soon as the concrete is no longer plastic.
Use
EVAPRE is ideal for use as an evaporation retardant for concrete
surfaces where the evaporation rate exceeds the rate of bleeding.
EVAPRE can be used with the MEADOW-PATCH® and MEADOW-CRETE® lines
of repair mortars from W. R. MEADOWS. It can also be used with
condensed silica fume concrete, concrete containing fly ash and
most other cementitious products. When applying surface hardeners,
EVAPRE can be used after screeding and after the first floating
operation if necessary.
NOTE: EVAPRE is specifically designed to
fight off the destructive effects of early rapid evaporative moisture
loss. Early rapid evaporative moisture loss is addressed in ACI
Committee 305R-91, entitled "Recommended Practice for Hot
Weather Concreting." This report contains a chart on Page
5 that depicts the effect of concrete and air temperatures, relative
humidity and wind velocity on the rate of evaporation of surface
moisture from concrete. It provides a graphic method for estimating
the loss of surface moisture for various weather conditions.
Features and Benefits
- Significantly reduces plastic shrinkage
and cracking caused by evaporation in low humidity, high temperature
and high winds
- Allows use of lower slump & lower
water:cement ratio concrete
- Provides smooth and durable concrete flatwork
- Reduces wind crusting, stickiness, and
sponginess which often cause poor and uneven surface texture
- Allows finishing crews to adhere to established
schedules
- Reduces overall cost because timing of
finishing operations is less critical
- VOC-compliant
- Helps minimize surface cracking due to
early water loss of silica fume concrete
- Available in exclusive, easy-to-use, 45-ounce
container.
Packaging
45 Ounce (1,596.9 cu. cm) Containers
1 Gallon (3.8 liters) Units
5 Gallon (18.93 liters) Pails
55 Gallon (208 liters) Drums
Coverage
One gallon (3.8 liters) of EVAPRE mixed with 9 gallons (34.2 liters)
of water will cover 2,000 - 4,000 sq.ft. (50 - 100 sq.m./L). Quantity
needed will increase if additional coats are required. 45 ounce
(1,596.9 cu. cm) container - pour into a 3-1/2 gallon sprayer,
add water and it is ready-to-use.
Application
STEP 1 - For the majority of applications, EVAPRE should be mixed
at a ratio of one (1) part EVAPRE to nine (9) parts of water.
Agitate EVAPRE before mixing with water. Agitate the diluted solution,
again, before applying. NOTE: EVAPRE is available in an easy-to-use,
exclusive 45-ounce container. Just pour into 3-1/2 gallon sprayer,
add water to fill and go to work.
STEP 2 - Apply EVAPRE with a commercial
sprayer. Use a Chapin 8005, or equivalent spray tip that produces
a flow rate of 1/2 gallon per minute.
STEP 3 - The EVAPRE diluted solution should
be applied immediately after screeding and/or between finishing
operations, as needed. Application is simplified by the fugitive
pigment, which will disappear completely upon drying. Do not allow
puddling. If puddling occurs, wipe up immediately and rinse with
water.
STEP 4 - Clean all equipment immediately
after use with soap and water.
STEP 5 - Finish concrete surface as required.
STEP 6 - Cure concrete after bleed water
or excess surface water has dissipated. The use of EVAPRE does
not negate the need for a quality concrete curing or sealing compound
from W. R. MEADOWS.
Note
The residue remaining on the surface
after finishing will not impair bonding or alter color. The protective
shield usually lasts as long as the concrete is plastic. Therefore,
all concrete surfaces must be properly cured, as well.
Precautions
DO NOT USE EVAPRE as a finishing aid for cementitious materials,
including dry shake surface hardeners or toppings. EVAPRE should
not be worked into the concrete surface, nor should it be used
to re-temper the concrete. EVAPRE should not be applied during
final troweling operations. EVAPRE is not a curing agent.
W. R. MEADOWS, INC. is not responsible for
compatibility or results, when EVAPRE is used with other manufacturer's
products.
Read and follow application information
and use in accordance with the Health and Safety information shown
on the container label. Refer to Material
Safety Data Sheet for complete health and safety information.
This material last updated July,
2004.
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