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CON MIXCONCRETE RUSH COAT · CRC

Pre-Mixed Polymer Modified Key Coat...Conmix Concrete Rush Coat is a dry pre-mixed mineral based bondingcoat to apply directly on smooth concrete walls and ceilings. It providesa mechanical key for subsequent layers of cement and Gypsum basedplasters. Laborious hacking of concrete is no more necessary.

TECHNICAL DATA

Description CRC consists of Portland Cement, processed sand and

chemical additives including powder polymers.

Binder Portland Cement

Aggregate size 4.0 mm processed sand

Appearance

Mixing Ratio

Approx Yield/Coverage

Density

Grey granular powder

9 litres water per 50 kg bag. Water/powder ratio 0.18

28 litres per bag

Wet 2.0 kg/ltr Dry 1.9 kg/ltr

15 N/mm2 @28 days

>2.5 N/mm2 @28 days

Compressive strength

Flexural strength

Working time

Curing

Packing

Shelf Life

Approx 45 minutes

Minimum72 hours by potable water

50 kg paper bags

12 months from date of production when stored

under dry conditions

Specification ASTM C387, BS 5262, 5492, 4551, DIN 18550

APPLICATION METHOD

BACKGROUND PREPARATION

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 CRC to

avoid debonding later on.

MIXING

CRC, 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 9.0 litres

per 50 kg bag (Le. approx. 18% by weight).

Add the CRC 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 plaster should not

be re-mixed.

CRC APPLICATION

The mixed CRC should be sprayed on to the

prepared background using a tyrolean box

or a power pattern spray gun. CRC should

not be applied using a trowel. Spray an

entire prepared area and allow some time

for the applied CRC to stiffen before

doubling back. Ensure that the applied CRC

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 CRC should be water cured for

a period of 3 days and allowed to harden.

For application procedures in case of

concrete containing microsilica, curing

compound or any special additive or special

building materials, kindly contact Conmix

technical department for assistance.

SPECIFICATION FOR CONMIX CONCRETE RUSH COAT -CRC

Coat - CRC, to be supplied by

All fairfaced concrete surfaces must be spray applied using pre-mixed Conmix Concrete Rush

Conmix Ltd. P.O. Box 5936, Sharjah, U.A.E.

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

Factory manufactured Conmix CRC, consists of portland Cement, de-dusted, oven dried and

graded natural sand and chemical additives.

Con mix CRC 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.

STORAGE

Conmix CRC must be stored in a dry place,

off the ground and well covered. Hard or

lumpy material must be rejected.

29-03/03

P.O.BOX 5936, SHARJAH - U.A.E. TEL: +971 65314155 FAX: +971 65314332 e-mail: conplast@conmix.comWebsite http://www.conmix.com