Pouring Concrete Walls In Lifts

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

Pouring concrete walls in lifts.

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. In actual practice each wall was completed in a single continuous pour in one day. Reduce cold joints honeycombing and bugholes by training workers how to place and vibrate concrete in walls.

Allow concrete to cure. Pour concrete in layers with a thickness ranging from 30cm to 50cm if the height of the rc column is large. See below for more information on contraction joints remove forms and install waterproofing and drainage system. Drag a straight 2x4 screed board across the top of the concrete forms to level the concrete.

The basic principles of placement and vibration are the same for any placing equipment used. 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 and level the concrete. If the wall exceeds four feet in height footings should be poured separately.

Wall to a maximum of 10 to 12 feet in height during one concrete pour. These walls also have the concrete placement in multiple lifts following the same procedure. Finish the surface of the wall as desired. If problems occur however corrective action can minimize their recurrence.

Make multiple passes if needed to create a flat evenly filled area. Pour footings and wall. 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. Place concrete at or close to its final position.

If the height of the wall or column form is not considerably long pour concrete from the top of the forms. The pressure in the icf forms is based on how high the concrete is poured at once. Place concrete walls with a maximum 60cm layer in one pass to avoid segregation. Create contraction joints every 4 6 feet.

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. 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.

This placement method is a standard practice in the icf industry.