AC 40
External Anti-Carbonation Facade Membrane
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 contaminants
Water based, safe to use, low odour and easy cleansing
Decorative – choice of colours
ARDEX ENDURA (INDIA) PRIVATE LIMITED
Corporate Office & Regd. Office:
Unit No. 406 & 407, “Brigade Rubix”,
No. 20, HMT Campus, Yeshwanthapur Hobli,
Bengaluru - 560013. Karnataka, INDIA.
CIN No: U24233KA1997PTC022383
Tel: +91 80 66746500
Fax: +91 80 66746540
Email: [email protected]
Visit us: www.ardexendura.com
AC 40
External Anti-Carbonation Facade Membrane
DESCRIPTION
AC 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 product‘s 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.
If the surface temperature is from 35°C to
45°C, the thickness required to achieve anti carbonation will be higher and will be approx.
600 microns DFT.
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, high
traffic density areas for application over
concrete and brick surfaces.
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
must be removed to a firmly bonded substrate.
Concrete surface pores must be open to
enable good adhesion.
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 10°C or
above 35°C. Do not apply if rain is imminent.
AC 40 can be applied directly over hairline
cracks. All other cracks should be treated with
polyurethane sealant like
ARDEX ENDURA SU 10.
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.
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.
Effects of Carbonation on concrete structure
All prepared surfaces should be primed with
one coat of ARDEX ENDURA WPM 265 /
WPM 300 other highly porous surfaces may
require two coats. Allow primer to be dry
before applying the AC 40.
Priming
FEATURES/BENEFITS
!
!
!
!
!
Cracks and voids
The action of atmospheric carbon dioxide on
lime mortars and cement concretes has been
known for centuries. Roman plasters used airhardened 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 dioxide
emitted 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 can
prevent 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.
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 2.8m²² to achieve a wet film thickness of
0.35mm, and allow it to dry.
Apply the second coat at approximately the
same rate to achieve a final dry film thickness
of around 0.35mm.
Thickness of the coatings is an important
criterion which decides rate of carbon dioxide
diffusion.
Surface Finish
The surface finish achieved can be varied by
selection of method of application. Prior to the
Surface Finish
Profile
High Texture
Medium Texture
Low Texture
Ripple Texture
Roller Type
st
1 Coat
2nd Coat
Med. Texture
Nap
Med. Texture
Nap
Med. Texture
Med. Texture
Nap
Nap
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 a
low surface profile while a 15 – 24 mm nap
produces a higher surface profile.
PACK SIZE
15 Litres
COVERAGE
CLEAN UP & DISPOSAL
Coverage: 1 x 15 litre unit of AC 40 will cover
approximately 21m²²(at a dry film thickness of
0.35mm after two coats).
Clean 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.
STORAGE AND SHELF LIFE
For further information please refer to The
Material Safety Data Sheet.
The shelf life of AC 40 is 12 months in the
original unopened packaging when stored in a
cool, dry and well ventilated area. Keep
containers securely sealed. DO NOT allow to
freeze. Do not store in direct sunlight. Replace
lid tightly after use. Product should be used
within 12 months of the container being
opened.
AC 40 is non-hazardous; non-dangerous goods.
Do not breath gas/ fumes/ vapour/ spray.
Avoid contact with skin. If contact with eyes,
rinse thoroughly with water.
TECHNICAL DATA
CONDITIONS OF SALE
AC 40
@ 27±1°C
Colour
Available in selected
colour range
Solid Content
60±2%
1.30 g/cc
32,200 cps
10°C - 35°C
Density
Viscosity
Application
Temperature
SAFETY PRECAUTIONS
Sold subject to the Company's conditions
of sale which are available on request.
NOTE
The information supplied in this datasheet is
based upon extensive experience and is given
in 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.
Drying time: (27°C/50% RH)
2 hours
4 hours
7 days
Surface Dry
Recoat
Hard Dry
Bond Strength
1 Day
7 Days
Elongation (28 days)
Tensile strength
0.79 N/mm²²
1.23 N/mm²²
296%
1.44 MPa
C02 Permeability Test Report
Co2 permeability, 23°C
Sample
Thickness
Mm
(êm*24)/êt
A
êC
P1
i
g
m²
%
Kpa
g/m².d
m
Sd
µ
5
M1
0.18
0.0504
0.00554
10
107
8.5
29
1.63x10
M2
0.18
0.0519
0.00554
10
107
8.8
29
1.58x10
M3
0.20
0.0446
0.00554
10
107
7.5
33
1.66x10
5
5
5
M4
0.33
0.0309
0.00554
10
107
5.2
48
1.45x10
M5
0.33
0.0307
0.00554
10
107
5.2
48
1.46x10
M6
0.34
0.0295
0.00554
10
107
5.0
50
1.48x10
Sample
Thickness
(êm*24)/êt
A
êC
P1
i
Sd
g
m²
%
Kpa
g/m².d
m
5
5
Co2 permeability, 15°C
Mm
µ
5
M1
0.18
0.0344
0.00554
10
103.7
5.8
42
2.38x10
M2
0.18
0.0354
0.00554
10
103.7
6.0
42
2.31x10
M3
0.20
0.0322
0.00554
10
103.7
5.5
46
2.29x10
M4
0.33
0.0212
0.00554
10
103.7
3.6
70
2.11x10
M5
0.33
0.0211
0.00554
10
103.7
3.6
70
2.11x10
M6
0.34
0.0202
0.00554
10
103.7
3.4
73
2.15x10
5
5
5
5
5
Wherein,
i
: Carbon dioxide diffusion flux
: Diffusion-equivalent air layer thickness
: Diffusion resistance number
03/15
Sd
µ