Pouring Concrete Walls In Lifts

Finish the surface of the wall as desired.

Pouring concrete walls in lifts.

These walls also have the concrete placement in multiple lifts following the same procedure. Have a helper add or remove concrete in front of the screed as you pull it. If the height of the wall or column form is not considerably long pour concrete from the top of the forms. This is done in multiple lifts of around 4 feet or less.

Place concrete at or close to its final position. If the wall exceeds four feet in height footings should be poured separately. Reduce cold joints honeycombing and bugholes by training workers how to place and vibrate concrete in walls. If the full hydrostatic pressure assumption was imposed the lift height would be limited to 11 feet requiring more than three separate concrete placements.

How to pour concrete in columns and walls. Make multiple passes if needed to create a flat evenly filled area. The basic principles of placement and vibration are the same for any placing equipment used. Allow concrete to cure.

If problems occur however corrective action can minimize their recurrence. The pressure in the icf forms is based on how high the concrete is poured at once. See below for more information on contraction joints remove forms and install waterproofing and drainage system. The layer thickness ranges from 300mm to 500mm and the time between successive layers should not exceed 30 minutes for normal weather condition and 20 minutes for hot weather condition.

In actual practice each wall was completed in a single continuous pour in one day. The 4 foot lift height is a recommendation as a guideline to. In this project 40 foot concrete walls were poured using formwork rated at 1650 psf. Place concrete walls with a maximum 60cm layer in one pass to avoid segregation.

In commercial construction walls may be higher 14 to 18 feet. If too much concrete is poured in one place at one time the pressure build up could become too much for the icfs to handle. By pouring in lifts the first part of the concrete starts to set up slightly slake reducing pressure on the lower forms. This placement method is a standard practice in the icf industry.

Drag a straight 2x4 screed board across the top of the concrete forms to level the concrete. Wall to a maximum of 10 to 12 feet in height during one concrete pour. Create contraction joints every 4 6 feet. Pour concrete in layers with a thickness ranging from 30cm to 50cm if the height of the rc column is large.

Pour and level the concrete.