Pouring Concrete Walls In Lifts

Finish the surface of the wall as desired.

Pouring concrete walls in lifts.

See below for more information on contraction joints remove forms and install waterproofing and drainage system. The basic principles of placement and vibration are the same for any placing equipment used. Pour concrete in layers with a thickness ranging from 30cm to 50cm if the height of the rc column is large. The 4 foot lift height is a recommendation as a guideline to.

Pour and level the concrete. 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. Pouring of concrete in columns and walls if the height of these elements is large then it is recommended to place concrete in layers. Make multiple passes if needed to create a flat evenly filled area.

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. 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. Have a helper add or remove concrete in front of the screed as you pull it.

Wall to a maximum of 10 to 12 feet in height during one concrete pour. If the height of the wall or column form is not considerably long pour concrete from the top of the forms. Place concrete at or close to its final position. Allow concrete to cure.

In this project 40 foot concrete walls were poured using formwork rated at 1650 psf. Available from diy stores and ready mix concrete companies these contain soluble emulsions that form a protective film when sprayed directly onto the surface of newly poured concrete slabs or walls. Create contraction joints every 4 6 feet. Pour footings and wall.

In actual practice each wall was completed in a single continuous pour in one day. Place concrete walls with a maximum 60cm layer in one pass to avoid segregation. How to pour concrete in columns and walls. By pouring in lifts the first part of the concrete starts to set up slightly slake reducing pressure on the lower forms.

These walls also have the concrete placement in multiple lifts following the same procedure. 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. If the wall exceeds four feet in height footings should be poured separately.

In commercial construction walls may be higher 14 to 18 feet.