CASTECHWT-140
Liquid Crystalline Permeability Reducing Admixture
CASTECH WT-140 Liquid is an integral liquid 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-140 Liquid is an integral liquid crystalline permeability reducing admixture for concrete. It is designed to permanently reduce water permeability and enhance the durability of concrete structures. CASTECH WT-140 Liquid consist of various active proprietary chemicals which reacts with the moisture in fresh concrete and the by-products of cement hydration to cause a reaction, which generates an insoluble crystalline deposit throughout the pores and capillary tracts of the concrete. These crystalline deposits effectively reduce permeability, capillary absorption and penetration of water and other liquids into the concrete. CASTECH WT-140 Liquid is formulated to meet the requirements of ASTM C494/AASHTO M 194, Type S and is certified to NSF/ANSI/CAN 61
Typical uses
CASTECH WT-140 Liquid 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-140 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 0.5 mm.
- Enhanced Durability – Reduces water ingress, protecting reinforcement and extending service life.
Reducing Admixture
- 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
| Characteristic | Specification |
|---|---|
| Composition | Proprietary crystalline chemicals in an aqueous solution |
| Form | Liquid |
| Color | Clear to Cloudy Liquid |
| Recommended | 1-2.5% by weight of cementitious |
| Dosage | materials |
| Density | ≈ 1.09 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 1-2.5% by weight of cementitious materials.
- The mix water must be reduced by an equivalent volume of CASTECH WT-140 Liquid used.
- Conduct trial mixes with project materials to determine optimal dosage.
Mixing
- Measure the required quantity manually or by automated dispenser.
- Add CASTECH WT-140 Liquid directly into the freshly mixed concrete, or as an integral material in the batching cycle. Do NOT pre-mix with dry cement.
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
- 20 Litre plastic pails, 200 Litre drums, and 1000 Litre IBC totes.
- Storage: Store in original packaging in a dry warehouse between 5°C and 50°C. Protect from direct sunlight and freezing. If frozen, thaw and agitate thoroughly before use.
- Shelf life: 12 months from date of manufacture in original, unopened packaging. Sedimentation may occur; agitate before use.
Coverage
- Based on a standard dosage of 1-2.5% of cementitious materials (e.g., 400 kg/m³cement).
- Consumption: Approximately 4-10 Liters per m³ of concrete.
Packaging & storage
See the TDS for details.
