Pouring Concrete Walls In Lifts

If problems occur however corrective action can minimize their recurrence.

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. Allow concrete to cure. The pressure in the icf forms is based on how high the concrete is poured at once. Pour and level the concrete.

This placement method is a standard practice in the icf industry. Pour concrete in layers with a thickness ranging from 30cm to 50cm if the height of the rc column is large. Pour footings and wall. Wall to a maximum of 10 to 12 feet in height during one concrete pour.

Place concrete at or close to its final position. Reduce cold joints honeycombing and bugholes by training workers how to place and vibrate concrete in walls. How to pour concrete in columns and walls. Have a helper add or remove concrete in front of the screed as you pull it.

These walls also have the concrete placement in multiple lifts following the same procedure. Finish the surface of the wall as desired. 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. Make multiple passes if needed to create a flat evenly filled area.

In actual practice each wall was completed in a single continuous pour in one day. Create contraction joints every 4 6 feet. In this project 40 foot concrete walls were poured using formwork rated at 1650 psf. See below for more information on contraction joints remove forms and install waterproofing and drainage system.

In commercial construction walls may be higher 14 to 18 feet. If the wall exceeds four feet in height footings should be poured separately. If the height of the wall or column form is not considerably long pour concrete from the top of the forms. The 4 foot lift height is a recommendation as a guideline to.

Drag a straight 2x4 screed board across the top of the concrete forms to level the concrete. This is done in multiple lifts of around 4 feet or less. By pouring in lifts the first part of the concrete starts to set up slightly slake reducing pressure on the lower forms. 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.

The basic principles of placement and vibration are the same for any placing equipment used.