Contec C1 - Concrete Waterproofing Compound by Crystalisation
CRYSTALLINE GROWTH PRINCIPLE
Contec crystallising waterproofing compound is an intelligent, self-sealing waterproofing system that transforms porous concrete into a permanent, water-resistant barrier. The system provides a structural defence against water damage and steel reinforcement corrosion. When Contec crystallising waterproofing compound is combined with water and concrete, it reacts with the unhydrated cement particles to form millions of needle-like crystals. Over a period of weeks and months, these crystals grow, filling the naturally occurring pores and voids in concrete, and permanently blocking the pathways for water and waterborne contaminants.
Contec C1 is a cementitious powder compound used to waterproof concrete. Contec C1 contains chemicals which react with concrete, forming a waterproofing crystalline structure within the pores of the concrete.
EXISTING CONCRETE WATERPROOFING – REPAIR AND MAINTENANCE
REMEDIAL (NEGATIVE TANKING)
Ensure the surface is well prepared. Remedial applications, defective concrete cut out and repaired with Contec C1.
Slurry applications need the surface to be saturated with water first. Then apply 2 coats of Contec C1with brush or soft broom. Allow 2 hours between coats.
SLURRY APPLICATION
Prior to application, all cracks and joints are to be repaired and cleaned. Mix Contec C1 into a slurry consistency, 5 parts powder to 2 parts clean water. Using a concrete brush, apply an aggressive circular motion to coat the concrete. Allow the product to harden (approximately 3 hours)
SLURRY COVERAGE
0.8 kg per m2
CURING
Completed applications should be moist cured for 48 hours and protected from rain and light traffic for 12 hours. Heavy traffic should be avoided until the surface has hardened. Treated concrete surfaces should not be permanently exposed to liquids for 7 days. Finishes containing Portland cement may be applied over Contec C1 after 3 hours, but other paint and coating finishes should not be applied before 28 days.
NEW CONCRETE STRUCTURE WATERPROOFING – PROTECTION AND STRENGTH
INTERNAL MEMBRANE FOR WATERPROOF SHRINK RESISTANT CONCRETE AND SHOTCRETE
Add 5kg of Contec C1 per cubic meter of concrete. Due to the plasticising effect, reduction of the mix water may be required to attain desired slump or workability. Alternately, Contec C1 can be applied to freshly poured concrete as a dry-shake treatment during the finishing process.
PRODUCT INFORMATION
Water used in the concrete mix MUST be reduced by approximately 12½ % for a normal concrete or shotcrete mix design to gain a similar slump.
No other additive should be used unless specifically designed and approved for special applications.
C1 concrete will pump more easily and allow easy finishing and cleaning up.
C1 normal usage is 1½ % by weight of the cement content of the mix (include fly-ash and silica fume) to a maximum of 6kg per cubic metre of concrete.
C1 is available in plastic pails. Before opening the pails turn upside down to aerate the contents and overcome storage compaction.
DIRECTIONS FOR USE
C1 ADDED AT THE SITE
The pre-weighed powder should be added slowly and mixed for a minimum of 10 minutes in the transit truck bowl or concrete mixer. Ensure water content had been adjusted as above.
C1 ADDED AT PRE-MIX PLANT
The mix design must allow for a reduction of water as detailed above.
C1 powder supplied in pails should be added slowly to pre-mixed concrete.
BLOCK FILL
C1 can be used as an additive to a block fill mix to assist waterproofing where an external membrane is not used. Ensure the cavity is clean, keep the cavity moist prior to filling and ensure entrapped air is expelled from all sections, particularly at the base.
NOTE: Should the delivery and placing time exceed 1 hour it is recommended to add C1 to the transit truck bowl at site.
gENERAL INFORMATION
PHYSICAL PROPERTIES
Colour GreyTexture Powder
Particle Size 40-150 microns
Bulk Density 1.4
PH (when mixed) 13
Rate of Penetration 2 mm per week
PRECAUTIONS
Do not apply when the surface temperature is below 5 oC. Contec C1 in a slurry format has a high pH which necessitates protective clothing and eye wear. The product is not designed to be a decorative surface and will change the surface colour.
PACKAGING
2.5 kg can, 6.25 kg pail, 12.5 kg pail
SAFETY PRECAUTIONS
Wear rubber gloves and protective clothing. Avoid contact with skin and eyes. Avoid inhaling product dust.
FIRST AID
If poisoning occurs contact a doctor. If effected flush repeatedly with water and wash skin thoroughly.
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