Concure AV: Technical Details, Specifications, Features and Entities

Product Overview

Concure AV is an aliphatic alcohol evaporative retarder supplied as a violet liquid concentrate designed to reduce shrinkage cracks in plastic concrete by forming a protective film on freshly placed concrete surfaces. It is manufactured and supplied by Fosroc and represents an innovative solution for concrete surface protection during the critical early curing phase.

Key Features and Advantages

Concure AV offers several significant benefits for concrete construction:

• Reduces and often eliminates the formation of shrinkage cracks in plastic concrete
• Gives superior finishing properties during unfavourable weather conditions such as high temperature and low humidity
• Maintains a plastic and workable surface, preventing surfaces from crusting
• Does not discolour the finished concrete or leave any residue
• Minimises formation of surface efflorescence on concrete
• Non-hazardous formulation suitable for various weather conditions

Product Composition and Description

Concure AV is formulated as a dispersion of high fatty alcohols that form a protective film on freshly placed concrete. In its diluted form, it appears as a violet liquid that dries clear on the concrete surface. The product functions by reducing rapid water evaporation from the surface of newly placed concrete, which is the primary cause of shrinkage cracks.

Appearance and Physical Properties

Property	Specification
Appearance (Concentrate)	Violet coloured liquid
Appearance (Dried)	Dries clear
Specific Gravity	1.03 at 25°C
VOC Content	186 grams per litre

Application Specifications

Dilution Requirements

Concure AV must be diluted with clean water before application at the following ratios:

• Standard dilution range: 4:1 to 9:1 (water to Concure AV)
• For dry weather: 4:1 dilution is recommended (4 parts water to 1 part Concure AV)
• For normal conditions: Dilution rate of 1:4 is recommended for optimum performance

Coverage and Yield

The coverage rate depends on the dilution ratio used:

• At 4:1 dilution: 1 litre of Concure AV yields 5 litres of sprayable material, covering approximately 50m² per application
• At 9:1 dilution: 1 litre of Concure AV yields 10 litres of sprayable material, covering approximately 100m² per application

Coverage rates may vary depending on the roughness of concrete surfaces.

Application Method

Concure AV must be applied as a fine mist using normal spraying apparatus:

• Equipment types: Hand spray equipment or power spray equipment
• Application pattern: Fine mist application to completely cover the concrete surface uniformly
• Application timing: Spray application should be carried out after initial screeding of the concrete
• Surface condition: Apply when a light film of bleed water remains on the plastic concrete surface

Surface Finishing Sequence

After Concure AV has been sprayed:

1. Proceed with normal floating
2. In extremely hot or dry conditions, make additional applications after:
   • Wood floating operations
   • Steel trowelling operations
3. Apply subsequent curing compound as soon as possible after Concure AV has dried and there is no residual bleed water

Suitable Applications

Concure AV is useful in all types of flat concrete applications, whether:

• Plain or coloured concrete
• Machine or hand finished
• Stamped concrete
• Rendered surfaces

Storage and Shelf Life

• Shelf life: 18 months if kept in a dry store in original, unopened packs
• Storage conditions: Store in original unopened packs in dry conditions
• Temperature sensitivity: If stored at high temperatures and/or high humidity conditions, shelf life may be reduced
• Daily mixing recommendation: It is preferable to mix only the amount required on a daily basis

Product Supply

Container Size	Product Code
20 litre	FC644444-20L
200 litre	FC644444-200L

Limitations and Considerations

What Concure AV Cannot Do

• Not a curing compound: Concure AV is not a curing compound as its function applies only to plastic concrete
• Does not prevent all plastic cracking: Will not prevent plastic cracking caused by pouring directly onto hot absorbent sub-grades
• Requires proper conditions: The film will not form if the surface is very rough
• Requires uniform application: Must be applied uniformly and immediately after initial screeding to produce a continuous protective film

Important Conditions

• Excessive bleed water: Application should be delayed if excessive bleed water is present; apply only when a light film remains
• High humidity: In very high humidity conditions, the need for Concure AV is reduced, but evaporation time will be longer
• Subsequent curing: After final trowelling/finishing of concrete, apply one of the Concure range of curing compounds to ensure effective curing

Cleaning and Removal

• Spillage or overspray: Should be wiped off immediately, then rinsed with water
• Stain removal: Stains can be removed with household type chlorinated bleach

Safety and Documentation

• Safety Data Sheet: Available from the Fosroc website and must be read before use
• Technical Data Sheet: Available from the Fosroc website summarizing product knowledge and application data
• Emergency contact: In case of emergency, contact the Poisons Information Centre at phone 13 11 26 (within Australia) or a doctor for advice

Application Temperature

While specific minimum application temperature is not explicitly stated in the primary specifications, Concure AV should be applied under conditions that permit proper film formation and water evaporation.

References

• [1] Fosroc_Concure_AV_TDS.pdf