anti carbonation
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ARDEX ENDURA (INDIA) PRIVATE LIMITED
Corporate Office & Regd. Office:
Unit No. 406 & 407, Brigade Rubix,No. 20, Yeshwanthapur Hobli, HMT Campus,
Bangalore - 560022. Karnataka, INDIA.
CIN No: U24233KA1997PTC022383
Tel: +91 80 66746500
Fax: +91 80 66746540
Email: customercare@ardexendura.com
Visit us: www.ardexendura.com
Features
External anti-carbonation facade membrane
Semi-permeable membrane allows wall surface to breathe
Contains fungi and algae growth inhibitors
Provides excellent UV resistance and long term protection from elements
Water based, safe to use, low odour and easy cleaning
Decorative choice of colours
ExternalAnti-Carbonation Facade Membrane
AC 40
DRAFT COPY 09 - 4 - 2014
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PRODUCT DESCRIPTIONAC 40 is an extremely weather resistant water
based acrylic waterproofing membrane.
Specially designed as an exposed facade
membrane, AC 40 prevents moisture, chloride
ion and carbon dioxide entering and damaging
the building structure while still allowing the
substrate to breath.
AC 40 is also highly resistant to dirt retention,
as well as containing fungi and algae growth
inhibitors. The products flexibility and high
build qualities allow it to be applied over
hairline cracks.
AC 40 is water based, low in odour and is
available in a range of decorative colours.
FEATURES/BENEFITS
Highly flexible & durable
Self cleansing, low dirt retention
Resists fungi & algae growth
Large range of durable colours.
Vapour permeable (allows facade substrate
to breath).
Prevents chloride ion, sulfide ion and carbon
dioxide attack.
ACCEPTABLE SUBSTRATES
After appropriate surface preparation:- Rendered walls
Brick/masonry walls
Fibre cement sheets
Tilt up and pre-cast concrete
Light weight aerated concrete blocks
(eg CSR Hebel)
TYPICAL APPLICATIONS
Building facades and external walls.
Roof parapets.
Silos, lighthouses and other external
structures.
Particularly important in coastal areas, hightraffic density areas for application over
concrete and brick surfaces.
LIMITATIONS
Product should not be used in trafficable areas.
Other ARDEX ENDURA products are more
suitable for this application. Do not apply AC 40
if the surface temperature is below 10C or
above 35C.Do not apply if rain is imminent.
If the surface temperature is from 35C to
45C, the thickness required to achieve anti -carbonation will be higher and will be approx.
600 microns DFT.
BASIC APPLICATION INSTRUCTIONS
Surface preparation
The surface to be coated should be clean,
sound, and free from oil, grease, form release
agents or bondbreakers and other
contaminants. All areas of loose or flaking paint
AC 40External Anti-Carbonation Facade Membrane
must be removed to a firmly bonded substrate.Concrete surface pores must be open to
enable good adhesion.
Brief note on Anti Carbonation
Carbonation means chemical conversion to a
carbonate. Carbonation is a term which is
widely used in beverage industry. It refers to
the impregnation of Carbon dioxide into a fluid.
But in construction industry, carbonation is
referred to as the process of chemical
weathering by which minerals containing soda,
lime, potash are other basic oxides are
changed to carbonates by the action of Carbon
dioxide and water.
Effects of Carbonation on concrete structure
The action of atmospheric carbon dioxide on
lime mortars and cement concretes has been
known for centuries. Roman plasters used air-
hardened lime, which gained strength due to
the reaction of carbon dioxide with calcium
hydroxide formed an interlocked mass of
calcium carbonate. But, traditionally concrete is
reinforced with steel to increase tensile
strength. Concrete protects steel from
corrosion by forming a passive layer because
of very high alkalinity induced by cement and
other minerals. But many concrete structures
are exposed to atmospheric carbon dioxideemitted from various sources. In presence of
moisture / water and as describe in the above
reaction, atmospheric carbon dioxide diffuses
slowly through the concrete and the process of
carbonation is initiated. Due to the process, the
pH of concrete slowly turns acidic and
destroys the passive layer protecting the
reinforcing steel bars. Once the passive layer is
destroyed, rusting of steel bars begins.
Carbonation is a slow process but is
detrimental to concrete structures as life
expectancy of concrete structures are between
50 - 100 years.
It is possible to formulate coatings which canprevent the diffusion of Carbon dioxide and
thereby protect concrete structures from the
detrimental effects carbonation. This article
discusses the functionality of coatings which
can be called Anti Carbonation coatings.
Generally water based coatings are more
permeable to gases and water vapour.
Typically these coatings are based on polymer
dispersions. Water vapour permeability is a
desirable property to allow water vapour to
escape form the substrate. But, if the
permeability is too high, Carbon dioxide can
diffuse from atmosphere into the substrate
easily. Hence there is a need for coatings with
moderate gas permeability which can prevent
Carbon dioxide from diffusing into the
substrate while allowing moisture to escape.
Cracks and voidsAC 40 can be applied directly over hairline
cracks. All other cracks should be treated with
polyurethane sealant like
ARDEX ENDURA SU 10.
Other deep surface imperfections should be
repaired using ARDEX ENDURA concrete repair
mortars allowed to cure for 7 days before
applying the membrane. Refer to
ARDEX ENDURA Central Technical Service
Department for advice regarding areas of
concrete spalling. Irregular surfaces resulting
from peeled paint should be smoothed using
ARDEX ENDURA concrete repair systems.
Priming
All prepared surfaces should be primed with
one coat of ARDEX ENDURA WPM 265 /
WPM 300 other highly porous surfacesmayrequire two coats. Allow primer to be drybeforeapplying the AC 40.
Application of AC 40
Apply with nap roller, textured roller or paint
brush. Ensure that the coating is applied evenly
at the recommended coverage rates.
Apply the first coat of AC 40 at a rate of 1 litre
per 2.8m to achieve a wet film thickness of0.35mm, andallow it to dry.
Apply the second coat at approximately the
same rate to achieve a final dry film thickness
of around 0.35mm.
Surface Finish
The surface finish achieved can be varied by
selection of method of application. Prior to the
commencement of any project it is
recommended that a sample of the finish be
prepared for approval and that finish shall act
as the standard.
The length of the roller nap will vary the profile
of the texture although the nap length must suit
the substrate. A 12 15 mm nap produces alow surface profile while a 15 24 mm nap
produces a higher surface profile.
PACK SIZE15 Litres
Thickness of the coatings is an important
criterion which decides rate of carbon dioxide
diffusion.
High Texture
Medium Texture
Low Texture
Ripple Texture
Surface Finish
Profile
Med.
Med. Texture
Nap
Nap
Texture
nd
2 CoatMed.
Nap
Med. Texture
Nap
Texture
st
1 Coat
Roller Type
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COVERAGECoverage: 1 x 15 litre unit of AC 40 will cover
approximately 21m (at a dry film thickness ofafter two coats).
STORAGEAND SHELFLIFEThe shelf life of AC 40 is 12 months in theoriginal unopened packaging when stored in a
cool,dry and well ventilated area. Keepcontainers securelysealed. DO NOT allow tofreeze. Do not store in directsunlight. Replacelid tightly after use. Product shouldbe usedwithin 6 months of the container being opened.
TECHNICAL DATA
AC 40 @ 271C
Colour Available in selected
colour range
Specific Gravity 1.3Kg/L
Application Temperature 10C - 35C
Drying time: (27C/50% RH)
Surface Dry 2 hours
Recoat 4 hours
Hard Dry 7 days
Bond Strength
1 Day 0.79 N/mm
7 Days 1.23 N/mm
Solid Content 602%
Density 1.30 g/cc
Viscosity 32,200 cps
C0 Permeability Test Report2
0.35mm
Co permeability, 23C2
Sample Thickness (m*24)/t A C P1 i S d
Mm g m % Kpa g/m.d m
5M1 0.18 0.0504 0.00554 10 107 8.5 29 1.63x10
5M2 0.18 0.0519 0.00554 10 107 8.8 29 1.58x10
5M3 0 .20 0 .0446 0 .00554 10 107 7 .5 33 1 .66x10
5M4 0.33 0.0309 0.00554 10 107 5.2 48 1.45x10
5M5 0.33 0.0307 0.00554 10 107 5.2 48 1.46x10
5M6 0.34 0.0295 0.00554 10 107 5.0 50 1.48x10
Co permeability, 15C2
Sample Thickness (m*24)/t A C P1 i S d
Mm g m % Kpa g/m.d m
5M1 0.18 0.0344 0.00554 10 103.7 5.8 42 2.38x10
5M2 0.18 0.0354 0.00554 10 103.7 6.0 42 2.31x10
5M3 0.20 0.0322 0.00554 10 103.7 5.5 46 2.29x10
5M4 0.33 0.0212 0.00554 10 103.7 3.6 70 2.11x10
5
M5 0.33 0.0211 0.00554 10 103.7 3.6 70 2.11x10
5M6 0.34 0.0202 0.00554 10 103.7 3.4 73 2.15x10
Wherein,
i : Carbon dioxide diffusion flux
S : Diffusion-equivalent air layer thicknessd : Diffusion resistance number
CLEAN UP & DISPOSALClean all equipment with water prior to the
product drying. Dispose of containers in
compliance with all relevant local authorities,
state and federal laws and regulations.
For further information please refer to The
Material Safety Data Sheet.
SAFETY PRECAUTIONS
AC 40 is non-hazardous; non-dangerousgoods.Do not breathgas/fumes/vapour/spray.Avoid contact with skin. If contact with eyes,
rinsethoroughly with water.
The information supplied in this datasheetisbased upon extensive experience andis givenin good faith in order to help you. Our
Company policy is one of continuous Research
and Development; we therefore reserve the
right to update this information at any time
without prior notice. We also guarantee the
consistent high quality of our products;
however as we have no control over site
conditions or the execution of the work, we
accept no liability for any loss or damage
which may arise as a result thereof.
CONDITIONS OF SALESold subject to the Company's conditions
of sale which are available on request.
NOTE
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