EVAPRE™-RTU
Ready-to-Use Evaporation Retardant
DESCRIPTION
EVAPRE-RTU is a ready-to-use evaporation
retardant that is economical, high quality, and
water-based. It is specifically designed to form a
thin monomolecular film to reduce rapid moisture
loss from the concrete surface prior to curing.
EVAPRE-RTU 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 when using EVAPRE-RTU.
EVAPRE-RTU is also VOC-compliant.
EVAPRE-RTU significantly reduces plastic
shrinkage, 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-RTU
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.
USES
EVAPRE-RTU is ideal for use as an evaporation
retardant for concrete surfaces where the
evaporation rate exceeds the rate of bleeding.
EVAPRE-RTU can be used with condensed silica
fume concrete, concrete containing fly ash, and
all cementitous products. When applying surface
hardeners, EVAPRE-RTU can be used after
screeding and after the first floating operation, if
necessary.
NOTE:
EVAPRE-RTU 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:
Recommended Practice for Hot Weather
Concreting. This report contains a chart on page
five 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/BENEFITS |
- Significantly reduces plastic shrinkage and cracking caused by evaporation
in low humidity, high temperatures and high winds.
- Allows use of lower slump and 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…actual VOC content is 0 g/L.
- Helps minimize surface cracking due to early water loss of silica fume
concrete.
|
DATA
Packaging:
Coverage:
|
5 Gallon (18.9 Liter) Pails
55 Gallon (208 Liter) Drums
EVAPRE-RTU should be applied at 200-400 ft.²/ gal.
Quantity applied will increase if more than one application is made, as
in adverse drying conditions. |
LEED INFORMATION
May help contribute to LEED credits: |
- EQ Credit 4.2: Low-Emitting Materials:
Paints & Coatings
- MR Credit 5.1: Regional Materials: 10%
Extracted, Processed & Manufactured
Regionally
- MR Credit 5.2: Regional Materials: 20%
Extracted, Processed & Manufactured
Regionally
|
APPLICATION
STEP 1: Agitate EVAPRE-RTU before applying.
STEP 2: Apply EVAPRE-RTU with a
commercial sprayer. Use a Chapin 5797 or
equivalent spray tip that produces a flow rate of
1/2 gallon per minute.
STEP 3: EVAPRE-RTU 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-RTU does not negate the need for a
quality concrete curing or curing and 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-RTU as a finishing aid
for cementitious materials, including dry shake
surface hardeners or toppings. EVAPRE-RTU
should not be worked into the concrete surface,
nor should it be used to re-temper the concrete.
EVAPRE-RTU should not be applied during final
troweling operations. EVAPRE-RTU is not a
curing agent.
W. R. MEADOWS is not responsible for
compatibility or results when EVAPRE-RTU 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
August 2009.
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