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Set Retardation

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Set retarders are used where delay in setting time is required to ensure sufficient placement, vibration or compaction time.

Set retarders permit application of higher temperature curing of precast/prestressed concrete without negatively affecting the ultimate strength.

Applications:

• Long hauls
• Trucks waiting a long time - even for a small pour
• Undermanned placement crew
• Slow pour rate

Things to consider:

Project location - long or short haul

• Size of pour
• Rate of pour
• Placement method

Environment exterior, interior

Thick sections - (if dry windy conditions, early surface drying while the underlying concrete is still soft can make finishing difficult and result in a wavy or cracked surface

When a set retarder may not be required

• Short hauls with quick placement
• Cool moist interior location
• Residential or commercial basement
• Fast pour rate

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