CASTECHWT-145
Crystalline Permeability Reducing Admixture
CASTECH WT-145 is an integral powdered crystalline permeability reducing admixture for concrete. It is designed to permanently reduce water permeability and enhance the durability of concrete structures.
Overview
About
CASTECH WT-145 is an integral powdered crystalline permeability reducing admixture for concrete. It is designed to permanently reduce water permeability and enhance the durability of concrete structures. CASTECH WT-145 meets the requirements of ASTM C494/AASHTO M 194, Type S and is certified to NSF/ANSI/CAN 61.
Typical uses
CASTECH WT-145 is recommended for a wide range of
watertight concrete applications, including
Industrial Applications
Tunnels and Subway Stations
Manholes and Sewage Systems
Bridges and Water Treatment Plants
Dams, Reservoirs, and Water Tanks
Secondary Containment Structures
Commercial Applications
Underground Parking Garages
Basements and Elevator Pits
Shopping Centers and Data Centers
Water Parks and Swimming Pools
Residential Applications
Foundations and Concrete Basements
Swimming Pools
Standards
CASTECH WT-145 Complies with ASTM C494/AASHTO M 194, Type S. Certified to NSF/ANSI/CAN 61.
Benefits
Advantages
- Integral Protection – Provides uniform waterproofing throughout the entire concrete volume.
- Self-Sealing – Activates in the presence of moisture to seal non-moving cracks up to 0.4 mm.
- Enhanced Durability – Reduces water ingress, protecting reinforcement and extending service life.
- Hydro-static Resistance – Effective against water under pressure.
Minimal Impact on Concrete Properties
- Does not significantly affect set times or compressive strength.
- Cost-Effective – Lowers construction costs compared to external membranes.
Technical data
| (25°C, 50% RH) | Characteristic Specification |
|---|---|
| Composition | Proprietary crystalline chemicals in a cementitious carrier |
| Form | Dry Powder |
| Color | Light Gray |
| Recommend | 1.5 - 2.0% by weight of cementitious |
| Dosage | materials |
| Density | ≈ 1.30 kg/L (Typical) |
| Shelf Life | 12 months (in original, unopened |
Typical values. Refer to the TDS for full details and test conditions.
Application
Dosage
- Typical dosage is 1.5 - 2.0% by weight of cementitious content. Conduct trial mixes with project materials to determine optimal dosage.
Mixing
- Add 25 kg re-pulpable bags directly into the mixer, unopened, prior to or during the aggregate loading phase.
- Mix for a minimum of 3 minutes at medium/high speed to ensure complete bag disintegration and homogeneous dispersion.
- Do not add bags to freshly mixed concrete.
Application
- For optimum performance, design concrete with a minimum cementitious content of 350 kg/m³ and a maximum water-cement ratio of 0.42.
Packaging, Storage & Shelf Life
- 25 kg repulpable bags.
- Storage: Store in a dry environment on pallets, below 40°C.
- Shelf life: 12 months from date of manufacture in original, unopened packaging.
Coverage
- Based on a standard dosage of 2% by weight of cementitious materials (e.g., 400 kg/m³ cement).
- Consumption: Approximately 8.0 kg per m³ of concrete.
Packaging & storage
See the TDS for details.
