What is the difference between Type 1 and Type 2 compounds?

Type 1 is clear or translucent. Type 2 is white-pigmented to reflect sunlight and reduce heat gain, making it ideal for hot weather concreting (Clause 3).

What is the most important performance requirement?

Water retention efficiency. The compound must limit water loss to a maximum of 0.55 kg/m² over 72 hours when tested as per Annex B (Table 1).

When should the curing compound be applied?

It should be applied immediately after the final finishing operation, as soon as the free water (bleed water) on the surface has disappeared and there is no foot traffic.

Does this compound add strength to concrete?

No, it does not add strength directly. It prevents moisture loss, ensuring sufficient water is available for the cement to hydrate properly, which is essential for strength development.

IS 12163

: 2010

Liquid membrane-forming curing compounds for concrete - Specification

CurrentFrequently UsedSpecificationMaterials Science · Admixtures and Chemical Products for Concrete

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This standard specifies the requirements and testing methods for liquid membrane-forming compounds used for curing concrete. It classifies compounds into clear/translucent (Type 1) and white pigmented (Type 2) and defines performance criteria like water retention, drying time, and reflectance.

Specifies requirements for liquid membrane-forming compounds used for curing concrete to retain moisture.

Quick Reference Values

Maximum water loss at 72h0.55 kg/m²

Maximum drying time4 h

Minimum daylight reflectance for Type 2 compounds60 percent

Minimum solids content (Non-volatile matter)20 percent by mass

Practical Notes

Application rate is critical for performance; always follow manufacturer's recommendations, typically 4-5 m²/litre.

Type 2 (white pigmented) compounds are highly recommended for hot and sunny conditions to reflect solar radiation and reduce concrete temperature.

Ensure the concrete surface is damp but free of standing water before application for best results. Apply immediately after the bleed water sheen has disappeared.