Conbextra TA: Ultra-High Performance Cementitious Grout for Wind Turbine Foundations

Product Overview

Conbextra TA is a ready-to-use, ultra-high performance cementitious grout specifically engineered for grouting structural transition pieces of onshore wind turbine foundations. The product combines advanced cement chemistry with superior flow characteristics to meet the demanding requirements of modern wind energy infrastructure.

Key Features and Advantages

Conbextra TA delivers a comprehensive range of performance benefits for wind turbine foundation applications:

• High Flexural Strength and Modulus of Elasticity: Achieves exceptional strength without the addition of fiber reinforcement, which enhances the overall flow characteristics of the grout
• Rapid Strength Development: Enables removal of temporary forms and supports even at low temperatures, facilitating faster project schedules
• Very High Ultimate Compressive Strength: Delivers sustained structural performance over the service life of the foundation
• Fatigue Resistance: Ensures long-term durability under the cyclic loading conditions inherent in wind turbine operations
• Excellent Flowability: Suitable for both pumping and pouring applications across a wide range of construction scenarios
• Consistent Performance: No segregation or bleeding, ensuring uniform final physical properties and preventing pump blockages
• Unique Cement Chemistry: Controls heat of hydration, enabling both thin and thick sections to be cast efficiently
• High Workability Retention: Maintains flowability for extended periods, facilitating casting of large sections
• Positive Expansion After Casting: Compensates for natural shrinkage that occurs during curing

Technical Specifications

General Properties

Fresh Wet Properties

Mechanical Properties

Fatigue Testing

Conbextra TA is fatigue tested to both Model Code 1990 and 2010 S-N curves, ensuring verified performance under the cyclic stress conditions typical of wind turbine operations.

Supply and Yield Information

Packaging: 25kg bags (Made to Order with minimum order quantity of 800 bags; 90-day lead time)

Yield: Each 25kg bag yields approximately 10.2 litres of grout (allowance should be made for wastage during estimation)

Shelf Life: 12 months from date of manufacture when stored in proper conditions

Storage Requirements

• Store in dry conditions in original, unopened packaging
• Shelf life may be reduced if stored at high temperatures and/or high humidity
• Do not use if lumps are present in the product or loss of workability is experienced

Application Instructions Summary

Preparation Phase

Foundation Surface: Must be free from oil, grease, and loosely adherent material. Defective surfaces or laitance must be cut back to sound base. Bolt holes and fixing pockets must be blown clean.

Pre-soaking: Foundation should be flooded with fresh water several hours before grouting; free water must be removed immediately before application, with special attention to bolt holes and fixing pockets.

Formwork: Must be constructed leakproof with well-sealed joints, including outlets for pre-soaking water.

Mixing

Mechanical mixing is recommended using either a slow-speed mixer with high-shear paddle (for quantities up to 50kg) or a high-shear vane mixer (for larger quantities). Maximum water addition is 2.125 litres per 25kg bag. Mix continuously for 6-7 minutes to achieve smooth, consistent texture.

Placing

• Can be placed in thicknesses up to 250mm in a single pour
• Should be poured from one side to eliminate air entrapment
• Continuous grout flow must be maintained
• For large volumes, pumping is recommended with appropriate slurry lubrication of equipment

Curing

Exposed areas should be thoroughly cured using Concure curing membrane or wet hessian and polyethylene sheeting.

Standards Compliance

Conbextra TA complies with EN1504-6:2006, ensuring adherence to European standards for anchoring products and grouting materials.

Health, Safety, and Environmental Considerations

Alkalinity: Conbextra TA is alkaline and requires appropriate safety precautions during handling and application.

Personal Protective Equipment: Gloves, goggles, and dust mask should be worn. Avoid inhalation of dust during mixing.

Safety Contact Information: In emergencies within Australia, contact the Poisons Information Centre at 13 11 26 or seek medical advice immediately.

Fire Rating: Non-flammable

Technical Documentation: A Safety Data Sheet (SDS) is available from the Fosroc website and should be read carefully prior to use.

Application Temperature Limitations

• Should not be used below 0°C or above 40°C
• Substrate must be free of ice
• At temperatures 5°C or below, hot water (30-40°C) is recommended to accelerate strength development
• For temperatures below 2°C or above 35°C, contact Fosroc Technical Department for guidance
• Must not be exposed to moving water or rainfall during application and prior to final set

Manufacturer and Distribution

Conbextra TA is manufactured by Fosroc and supplied under the Fosroc trademark and brand. The product is distributed with technical support and compliance documentation through authorized channels.

References

• [1] Fosroc_Conbextra_BB92_TDS.pdf
• [2] Fosroc_Conbextra_TA_TDS.pdf
• [3] Fosroc_Conbextra_VG_TDS.pdf
• [4] Fosroc_Conbextra_BB92_(AU)_TDS.pdf