Curing Concrete - Portland Cement Association

Curing Concrete - Portland Cement Association

Curing Concrete Design and Control of Concrete Mixtures Chapter 15 Overview Curing basics Curing methods and materials Curing period and temperature Sealing compounds

Curing Concrete Curing Concrete Curing Methods and Materials

Supplying additional moisture Replaces moisture lost to hydration and evaporation Sealing in mix water

Prevents evaporation losses Accelerating curing Supplying moisture and heat to accelerate strength gain

Ponding and Immersion Ponding dikes around perimeter retain water on surface An ideal method to prevent moisture loss and uniform temperature

Intensive labor and supervision Immersion submerging cast element in water

Most thorough method of curing Commonly used in laboratory settings Fogging and Sprinkling

Wet Coverings Impervious Paper Plastic Sheets Membrane-Forming

Coumpounds Internal Curing Lightweight aggregates or superabsorbent polymers Provide internal moisture source

Counteracts self-desiccation Used in addition to external curing

Not suitable for counteracting evaporation losses Extra drying time needed for moisturesensitive applications Stea m Curin

g Stea m Curin g Forms Left in Place and

Insulation Forms help prevent evaporation losses Exposed surfaces must be protected

Wood forms should be kept moist Insulation maintains temperature during cold weather Can be coupled with formwork

Heated enclosures and hydronic heaters can be used Electrical, Oil, Microwave, and Infrared

Electrical methods: Use concrete as conductor Use reinforcement as conductor

Special wires Electric blankets or heated steel

forms Hot oil, water, or steam circulated in pipes Infrared used on enclosed/covered concrete Curing

Period and Temperature Sealers Summary Curing basics Curing methods and materials

Curing period and temperature Sealing compounds Questio ns ?

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