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TECHNICAL DATA

Description : BRC consists of Portland Cement, processed sand and chemical additives.

Binder : Portland Cement

Aggregate size : 2.0 mm

Appearance : Grey granular powder

Mixing Ratio : 9.5 ltrs of water per 50 kg bag Water/Powder ratio = 0.19

Approx. Yield/Coverage * : 31 ltrs per bag/20m2 per bag at 2 mm thickness

Density * : Wet: 1.90 kg/ltr Dry: 1.86 kg/ltr

Compressive Strength * : 15.0 N/mm2 @ 28 days

Flexural Strength * : 2.5 N/mm2 @ 28 days

Packaging : 50 Kg paper bags

Shelf Life : 12 months from date of production when stored under dry conditions

Working time : Approx. 45 minutes

Curing : Minimum 48 hours by potable water

Specification : BS 5262,5492, BSEN 1015, DIN 18550, ASTM

* Typical results under laboratory condition

BACKGROUND

The fair-faced concrete background should be

thoroughly cleaned devoid of dust, loose

particles, wood pieces, mould oil etc.

The suction in the background should be

neutralised by applying clean potable water.

Free water on the surface should be allowed to

disperse before spraying BRC to avoid

debonding later on.

APPLICATION METHOD

N o M o r e H a c k i n g . . .BRC is a dry pre mix mineral based bonding coat to apply on smoothconcrete walls and ceilings. It provides a mechanical key for subsequentlayers of cement and Gypsum based plasters. Laborious hacking ofconcrete is no more necessary.

Building History

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MIXING

BRC supplied in 50 kg bags has to be mixed

with potable water only, in a clean plastic

bucket or a clean, non-corrosive,

uncontaminated metal tub. To ensure a

homogeneous and uniform mix, an electric

agitator must be used.

The amount of water to be added is 9.50 litres

per 50 kg bag (i.e. approx. 19% by weight) .

Add the BRC to water, turn the contents of the

bag carefully adding small amounts at a time

and stir frequently. Once mixed, allow to stand

for 5 minutes and mix again before spraying.

No further water should be added to the mix.

Hard and set material should not be re-mixed

or used.

APPLICATION

The mixed BRC should be sprayed on to the

prepared background using a tyrolean box or

a power pattern spray gun. BRC should not be

applied using a trowel. Spray an entire

prepared area and allow some time for the

applied BRC to stiffen before doubling back.

Ensure that the applied BRC covers the entire

surface area. A rough texture is to be obtained

to provide a mechanical key for the

subsequent coat of plaster.

Conmix demonstration team shall assist in

these procedures upon request.

SPECIAL NOTES

The applied BRC should be water cured for a

period of 2 days (3-4 times daily) and allowed

to harden.

For application procedures in case of

concrete containing microsilica, GGBS, curing

compound or any special additive or special

building material, kindly contact Conmix

technical department for assistance.

STORAGE

Conmix BRC must be stored in a dry place,

off the ground and well covered. Hard or

lumpy material must be rejected.

SPECIFICATION FOR CONMIX BONDING RUSH COAT - BRC

All fair-faced concrete surfaces must be spray applied using pre mixed Conmix Bonding Rush

Coat - BRC, to be supplied by Conmix Ltd. P.O. Box 5936, Sharjah, U.A.E.

Tel: +971-6-5314155, Fax: +971-6-5314332, or their authorized distributor.

Factory manufactured Conmix BRC, consists of Portland Cement, processed sand and

chemical additives.

Conmix BRC application and the necessary substrate preparations must be in accordance with

the manufacturer’s data sheet recommendations, complying with the relevant BS, ASTM and

DIN Standards.