ADMIX C-500 NF

07160 | CEMENTITIOUS CRYSTALLINE
Concrete Waterproofing

Description
Xypex is a unique chemical treatment for the waterproofing, protection and improvement of concrete. XYPEX ADMIX C-500 NF is added to the concrete mix at the time of batching. Xypex Admix C-500 NF consists of Portland
cement and various active, proprietary chemicals. These active chemicals react with the moisture in fresh concrete and with the by-products of cement hydration to cause a catalytic reaction. This reaction generates a non-soluble crystalline formation throughout the pores and capillary tracts of the concrete that permanently seals the concrete and prevents the penetration of water and other liquids from any direction.
Xypex Admix C-Series
The Admix C-Series has been specially formulated to meet varying project and temperature conditions. Xypex Admix C-500 NF is specifically formulated to meet modern concrete practices that incorporate additives such
as fly ash and slag. For most concrete mix designs adding the Admix C-500 NF will have minimal or no effect on setting time. Xypex Admix C-1000 NF is designed for
typical Portland cement-rich concrete, where normal to
a mild retarded set is desired. Xypex Admix C-2000 NF is designed for projects where extended retardation
is required due to high ambient temperatures or long ready-mix delivery times. See Setting Time and Strength for more details. Consult with a Xypex technical services representative for the most appropriate Xypex Admix for your project.
Recommended for:
• Reservoirs
• Sewage and Water Treatment Plants
• Secondary Containment Structures
• Tunnels and Subway Systems
• Underground Vaults
• Foundations
• Parking Structures
• Swimming Pools
• Precast Components
Advantages
• Resists extreme hydrostatic pressure from either
positive or negative surface of the concrete
• Becomes an integral part of the substrate
• Highly resistant to aggressive chemicals

• Can seal static hairline cracks up to 0.4 mm
• Allows concrete to breathe
• Non-toxic
• Less costly to apply than most other methods
• Permanent
• Added to the concrete at time of batching and
therefore is not subject to climatic restraints
• Increases flexibility in construction scheduling
Packaging
Xypex Admix C-500 NF is packaged in various sizes. Contact your local Xypex representative for details.
Storage
Xypex products must be stored dry at a minimum temperature of 7ºC. Shelf life is one year when stored under proper conditions.
Dosage Rates
Xypex Admix C-500 NF (No Fines Grade):
1% – 1.5% by weight of cement
NOTE: Under certain conditions, the dosage rate for No Fines Grade may be as low as 0.8% depending on the quantity and type of total cementitious materials.
Consult with Xypex’s Technical Services Department for assistance in determining the appropriate dosage rate and for further information regarding enhanced chemical resistance, optimum concrete performance, or meeting the specific requirements and conditions of your project.
Test Data
PERMEABILITY
U.S. Army Corps of Engineers CRD C48-73,
“Permeability of Concrete”, Aviles Engineering Corp., Houston, USA
Two concrete samples containing Xypex Admix at 3% and 5% respectively, and an untreated control sample were tested for water permeability. Both the treated and untreated samples were subjected to a pressure of 150 psi (350 ft. water head). Results showed moisture and permeated water throughout the untreated sample after 24 hours. However, the Xypex Admix samples showed no leakage, and water penetration of only 1.5 mm after 120 hours (5 days).

Application Procedures

1. SURFACE PREPARATION Concrete surfaces to be treated must be clean and free of laitance, dirt, film, paint, coating or other foreign matter. Surfaces must also have an open capillary system to provide “tooth and suction” for the Xypex treatment. If surface is too smooth (e.g. where steel forms are used) or covered with excess form oil or other foreign matter, the concrete should be lightly sand-blasted, waterblasted, or etched with muriatic (HCL) acid.

2. STRUCTURAL REPAIR Rout out cracks, faulty con-struction joints and other structural defects to a depth of 37 mm and a width of 25 mm. Apply a brush coat of Xypex Concentrate as described in steps 5 & 6 and allow to dry for 10 minutes. Fill cavity by tightly compressing Dry-Pac into the groove with pneumatic packing tool or with hammer and wood block. Dry-Pac is prepared by mixing six parts Xypex Concentrate powder with one part water to a dry, lumpy consistency.

NOTE:
• Against a direct flow of water (leakage) or where there is excess moisture due to seepage, use Xypex Patch’n Plug then Xypex Dry-Pac followed by a brush coat of Xypex Concentrate. (Refer to Xypex Specification and Application Manual for full details.)
• For expansion joints or chronic moving cracks, flexible materials such as expansion joint sealants should be used.

3. WETTING CONCRETE Xypex requires a saturated substrate and a damp surface. Concrete surfaces must be thoroughly saturated with clean water prior to the application so as to aid the proper curing of the treatment and to ensure the growth of the crystalline formation deep within the pores of the concrete. Remove excess surface water before the application. If concrete surface dries out before application, it must be re-wetted.
4. MIXING FOR SLURRY COAT Mix Xypex powder with clean water to a creamy consistency in the following proportions:
• For Brush Application
• 0.65 – 0.8 kg/m2
• 5 parts powder to 2 parts water
• kg/m2
• 3 parts powder to 1 part water
• For Spray Application
• 0.65 – 0.8 kg/m2
• 5 parts powder to 3 parts water (ratio may vary with equipment type)
• Do not mix more Xypex material than can be applied in 20 minutes. Do not add water once mix starts to harden. Protect hands with rubber gloves.
5. APPLYING XYPEX Apply Xypex with a semi-stiff nylon bristle brush, push broom (for large horizontal surfaces) or specialized spray equipment. The coating must be uniformly applied and should be just under 1.25 mm.

When a second coat (Xypex Concentrate or Xypex

Modified) is required, it should be applied after the first coat has reached an initial set but while it is still “green” (less than 48 hours). Light pre-watering between coats may be required due to drying. The Xypex treatment must not be applied under rainy conditions or when ambient temperature is below 4ºC. For recommended equipment, contact Xypex Chemical Corporation or your local Xypex representative.

6. CURING A misty fog spray of clean water must be used for curing the Xypex treatment. Curing should begin as soon as the Xypex has set to the point where it will not be damaged by a fine spray of water. Under normal conditions, it is sufficient to spray Xypex-treated surfaces three times per day for two to three days. In hot or arid climates, spraying may be required more frequently. During the curing period, the coating must be protected from rainfall, frost, wind, the puddling of water and tem-peratures below 2ºC for a period of not less than 48 hours after application. If plastic sheeting is used as protec-tion, it must be raised off the Xypex to allow the coating to breathe. Xypex Gamma Cure may be used in lieu of water curing for certain applications (consult with Xypex

Chemical Corporation or your local Xypex representative).
NOTE: For concrete structures that hold liquids (e.g. reservoirs, swimming pools, tanks, etc.), Xypex should be cured for three days and allowed to set for 12 days before filling the structure with liquid.