anti carbonation

7/25/2019 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: [email protected]

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

04/14

anti carbonation

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