What is the primary performance requirement for a curing compound?

Its water retention capability. The water loss must not exceed 0.55 kg/m² in 72 hours when tested as per IS 9012 (Table 1).

What are the two types of curing compounds specified in IS 12163?

Type 1 is Clear or Translucent (may have a fugitive dye), and Type 2 is White Pigmented (Clause 3).

How quickly should the curing compound dry?

It should dry to a tack-free state in not more than 4 hours under specified test conditions (Table 1).

When should a white pigmented (Type 2) compound be used?

It is particularly suitable for concrete surfaces exposed to direct sunlight in hot climates, as its minimum 60% reflectance helps keep the concrete cool (Clause 3.1.2 and Table 1).

IS 12163

: 1999

Liquid membrane-forming curing compounds for concrete - Specification

SupersededFrequently UsedSpecificationMaterials Science · Admixtures and Chemical Products for Concrete

Superseded by IS 12163:2010

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This standard specifies the requirements for liquid membrane-forming compounds used for curing concrete. It covers two types (clear and white pigmented) and details the performance criteria for water retention, drying time, and reflectance, along with the necessary test methods.

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

Quick Reference Values

Maximum Water Loss0.55 kg/m² in 72 hours

Maximum Drying Time4 hours

Minimum Reflectance (Type 2)60 percent

Practical Notes

Ensure the concrete surface is damp but free of standing water before application for best results and to prevent crazing.

Application rate is crucial for forming an effective membrane; always follow manufacturer's guidelines, typically 4-5 m²/litre, to achieve the specified water retention.

White pigmented compounds (Type 2) are preferred for hot weather concreting as they reflect solar radiation, reducing the concrete temperature and thermal stresses.