Pouring Concrete Walls In Lifts

If the full hydrostatic pressure assumption was imposed the lift height would be limited to 11 feet requiring more than three separate concrete placements.

Pouring concrete walls in lifts.

Pouring of concrete in columns and walls if the height of these elements is large then it is recommended to place concrete in layers. 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. If the wall exceeds four feet in height footings should be poured separately.

Pour footings and wall. See below for more information on contraction joints remove forms and install waterproofing and drainage system. Make multiple passes if needed to create a flat evenly filled area. Have a helper add or remove concrete in front of the screed as you pull it.

The basic principles of placement and vibration are the same for any placing equipment used. 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. How to pour concrete in columns and walls. The pressure in the icf forms is based on how high the concrete is poured at once.

Reduce cold joints honeycombing and bugholes by training workers how to place and vibrate concrete in walls. Place concrete walls with a maximum 60cm layer in one pass to avoid segregation. Wall to a maximum of 10 to 12 feet in height during one concrete pour. Finish the surface of the wall as desired.

These walls also have the concrete placement in multiple lifts following the same procedure. Drag a straight 2x4 screed board across the top of the concrete forms to level the concrete. If the height of the wall or column form is not considerably long pour concrete from the top of the forms. In commercial construction walls may be higher 14 to 18 feet.

By pouring in lifts the first part of the concrete starts to set up slightly slake reducing pressure on the lower forms. In this project 40 foot concrete walls were poured using formwork rated at 1650 psf. If problems occur however corrective action can minimize their recurrence. This placement method is a standard practice in the icf industry.

In actual practice each wall was completed in a single continuous pour in one day. Create contraction joints every 4 6 feet. The 4 foot lift height is a recommendation as a guideline to. This is done in multiple lifts of around 4 feet or less.

Allow concrete to cure.