Integral Watertight Admixtures - Sika® WT-240 P
Permeability Reducing Admixture
Sika® WT-240 P is an integral powdered crystalline based permeability reducing admixture (PRA) for use in various watertight concrete applications. Sika® WT-240 P meets the requirements of ASTM C 494 Type S and is NSF/ANSI Standard 61 certified.
Sika® WT-240 P is a plant added crystalline based permeability reducing admixture. Sika® WT-240 P uses a unique combination of active ingredients, which react with the moisture within the concrete and with various products of the cement hydration process. This interaction forms insoluble compounds throughout the capillary system in concrete matrix, resulting in the reduced ability of concrete to conduct water flow. Use of Sika® WT-240 P in watertight concrete application can result in:
- Lower construction cost compare to traditional types of waterproofing.
- Simple one-step use results in reduced application time and faster construction process.
- Uniform waterproofing throughout the entire concrete volume.
- Improved resistance against hydrostatic pressure.
- Elimination of risk related to surface damage during construction process.
- Ability to seal concrete cracks up to 0.016 in (0.40 mm).
- Easy application due to repulpable bags.
- Meets the requirements of ASTM C 494 Type S.
- NSF/ANSI Standard 61 certified.
Usage
Use of Sika® WT-240 P is recommended but not limited to the following areas. Industrial Applications:
- Tunnels
- Subway Stations
- Manholes
- Bridges
- Water Tanks
- Dams and Reservoirs
- Water Treatment Plants
- Secondary Containment Structures
Commercial Applications:
- Shopping Centers
- Libraries
- Computer Rooms
- Elevator Pits
- Basements
- Water Parks
- Underground Parking Garages
Residential Applications:
- Foundations
- Concrete Basements
- Swimming Pools
Advantages
Sika® WT-240 P is a plant added crystalline based permeability reducing admixture. Sika® WT-240 P uses a unique combination of active ingredients, which react with the moisture within the concrete and with various products of the cement hydration process. This interaction forms insoluble compounds throughout the capillary system in concrete matrix, resulting in the reduced ability of concrete to conduct water flow. Use of Sika® WT-240 P in watertight concrete application can result in:
- Lower construction cost compare to traditional types of waterproofing.
- Simple one-step use results in reduced application time and faster construction process.
- Uniform waterproofing throughout the entire concrete volume.
- Improved resistance against hydrostatic pressure.
- Elimination of risk related to surface damage during construction process.
- Ability to seal concrete cracks up to 0.016 in (0.40 mm).
- Easy application due to repulpable bags.
- Meets the requirements of ASTM C 494 Type S.
- NSF/ANSI Standard 61 certified.
Packaging
12 lbs repulpable bags, 180 bags per pallet.
Color
Light Gray Powder
Product Details
Product Information
Shelf LifeShelf life of Sika® WT-240 P when stored unopened in dry warehouse conditions between 44 °F and 80 °F (7-27 °C) is 1 year.
Storage ConditionsSika® WT-240 P should be stored at above 44 °F (7 °C). Protect from moisture. Opened bags should be properly sealed to prevent moisture ingress. Product stored in re-sealed bags should be used within 3 months after opening.
Application
Application Information
MixingTo assure homogeneous dispersion and to maximize product performance, it is recommended to add Sika® WT-240 P during the mixing process at the concrete plant. Time of the addition depends on the concrete plant set up.
Central Mix Operations - Add product at recommended dosage into central mixing drum before introducing other mix components. In cases this is not possible due to a plant set up, add Sika® WT-240 P directly into mixing drum of ready mix truck before loading with freshly mixed concrete.
Dry Batch Operations - Add Sika® WT-240 P directly into the drum of the ready mix truck to ensure even distribution of Sika® WT-240 P throughout the entire concrete volume. It is recommended to introduce approximately 50-60 % of mixing water to form a slurry. Mix for 2-3 minutes before adding the rest of the materials to the ready mix truck according to standard mixing practices.
Precast Operations - Add Sika® WT-240 P either on a coarse aggregate belt or directly into the empty mixer before mixing process starts. To ensure optimum product dispersion throughout the entire concrete volume, do not add product to the freshly mixed concrete at the end of the batching cycle. This may lead to insufficient bag disintegration, lumping, balling and inadequate homogeneity of concrete mixture. Always allow Sika® WT-240 P to thoroughly mix at medium/high speed for at least 1 minute per cubic yard or a minimum 3 minutes.
Combination with other admixtures - Sika® WT-240 P can be used as a single admixture or in combination with other admixtures produced by Sika. Sika® WT-240 P can be used in combination with other supplementary materials. In this case the performance of the actual mix design should be verified to confirm accordance with project specifications.
Setting Time and Strength - Sika® WT-240 P is specifically designed to have minimum impact on set time characteristics and concrete compressive strength. Slight retardation of set may occur when Sika® WT-240 P is used in cold weather conditions. Concrete containing Sika® WT-240 P typically does not have negative impact on concrete compressive strength.
Concrete crack sealing will be effective in non-moving cracks only.
Proper curing of freshly placed concrete according to ACI 308.1 must be followed.
Consumption
Recommended DosageThe recommended dosage is 2 % by weight of cementitious materials. Dosage above or below recommended rate can be used based upon project specification.
See More
See Less