Water Proofing - DOV® COAT CRYSTALLINE

  DOV® Coat Crystallization type waterproofing system. A distinctive chemical formulation that penetrates concrete pores and forms insoluble crystals blocking off water entry. The active chemicals continue to crystallize whenever they come into contact with moisture making this system of waterproofing unique. Suited for waterproofing of concrete basements, sumps, swimming pools, water retaining structures, toilet slabs and roof slabs. The surface to be treated should be saturated with water before application.

Is a Cementitious, brush applied, waterproofing treatment for concrete. When it is mixed with water & applied to concrete, it penetrates into the concrete mass protecting against the passage of water.

  DOV® Coat Crystallization crystalline react chemically to form billions of needles like crystals which blocks the pores, voids & micro cracks in concrete. Pre saturation & subsequent re- wetting of the surface will cause deeper diffusion of the organic chemicals & formation of crystals at greater depth. It may take from seven days to one month to reach its maximum waterproofing capability, depending on the thickness of concrete. Environmental factors such as ambient temperature, density of concrete, moisture present & weather conditions all can effect the timing of sealing process. Under dry conditions, Dovcrystallisation crystalline lies dormant. However it becomes reactive whenever it is re-exposed to moisture. Dovcrystalline contains active waterproofing chemicals which react with moisture and unhydrated cement in the concrete, creating insoluble crystalline complexes which seal the capillaries and minor shrinkage cracks. They penetrate even against strong hydrostatic pressure, becoming an integral part of the concrete. The waterproofing chemicals remain active for the life of the structure, permanently sealing it from water penetration.

Area Of Application

Features & Benefits

• Stops water movement through concrete
• Protects reinforcing steel against corrosion
• Waterproofs minor cracking & seals shrinkage cracks up to 0.4 mm width.
• Its waterproofing capability increases with time. i.e. It remains permanently active.
• Does not get affected by surface wear or abrasion
• Can be applied to positive or negative side of concrete
• Non toxic, thus good for use in drinking water containments
• Treated concrete withstands hydrostatic pressure upto 150 mtr head.
• Easy in application, only mix water at site.
• Protects concrete against contaminated water & corrosion.
• Applicable on moist substrates.
• It allows concrete to breathe, but is not a vapour barrier
• Waterproofs by deep crystallisation, where slabs or concrete rafts / PCC are to be landscaped.

Method of Application

Surface Preparation to old and existing substrates

• Remove dirt, laitance, loose particles, paints, etc., by means of mechanical grinding, sandblasting, and pressure water cleaning, or suitable mechanical means.
• Remove all protrusions, chisel out honeycombed / damaged areas, repair the cracks and work back to sound concrete.
• It is extremely important to ensure that the surface should be sound and thoroughly surface prepared, and vacuum cleaned to a finish of a sand paper, to allow Dovcrystalline to penetrate effectively. This can be achieved by mechanical surface scarification, shot blasting, etc.
• Stop active water leakages using Dov pluge Instant Leak Plug, for severe infiltration.
• Thoroughly rinse the surface with water several times to reach a “saturated surface dry” (SSD) condition, where the surface should be damp, without any standing water.

Curing

For External/Exposed Surface

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• Completed application should be moist cured for a minimum of 2-3 days & protected from rain & light traffic for 12 hour. Start curing as soon as Dovcrystalline has hardened sufficiently so that it may not be damaged by a fine water spray. Heavy traffic should be avoided until the surface has hardened atleast for 5 days.
• Finishes containing Portland cement may be applied over Dovcrystalline after 3 hours, but other finishes & paints should not be applied before 28 days along with concrete.
• Back filling can be carried out after 36 hours of application of Dovcrystalline. Backfill material shall be moist & not contain rocks or large aggregates

For Water Retaining Structures

• Water tanks, etc., can be carefully filled with water after 3 to 7 days. Do not fill large tanks faster than 6.5 feet per hour ( 2 m / 24 hrs )
• After complete curing of Dovcrystalline, potable water tanks should be thoroughly rinsed with potable water prior to being placed in service.

Mixing of Dovcrystalline

• Mix Dovcrystalline powder to water in ratio 5 parts powder : 2 parts water for waterproofing purpose and 5 parts powder : 1 part water as a putty for repair purpose.
• Always mix powder to water & stir it well to obtain a lump free mixture. Mix only quantities to be used within 30 minutes. Mix Dov crystalline mechanically with clean water to a thick consistency. Separate containers of same volume should be used to measure powder & water.

Precautions & Limitations

• Application can be done under normal temperature conditions
• Heavy traffic should be avoided until the surface is hardened for atleast 5 days.
• Finishes containing Portland cement may be applied over Dovcrystalline after 3 to 4 hours
• Any paint or coating should be applied after 28 days only, over Dovcrystalline application, after thorough wire brushing, washing & removing any Dovcrystalline residual on surface.
• Dovcrystalline has a high pH, when mixed with water. Use protective gloves and clothing & goggles for eye protection.
• Not recommended over moving joints and structures subjected to movements
• Do not apply on dry substrate

On Existing or Old Substrates with Dampness

• Ensure thorough surface preparation by mechanical means, to remove all laitance, etc., to expose the pores in concrete and allow the penetration of the treatment.
• All crevices and holes in concrete shall be filled with Dovcrystalline powder mixed with water in a ratio of 5 parts powder : 1 part water.
• Over a concrete substrate in a SSD condition, apply Dovcrystalline mixed in a ratio 5 parts powder : 2 parts clean water, with a clean brush. Use an aggressive circular motion of the brush with Dovcrystalline slurry. Apply a second coat after 3 to 6 hours.
• Dovcrystalline treated surface shall be left to cure for 2-3 days, as mentioned above and protect from direct sunlight for this initial period. For full cure, give 28 days along with concrete.

Technical Information