Joing New Concrete Wall To Older One

Connect new foundation to existing.

Joing new concrete wall to older one.

The edge of the existing concrete that was sawed should be drilled and doweled so the new concrete won t separate lift or settle from the old concrete. Then build a perimeter or a wood brace that is the same height as you want the concrete to be. Both walls are 8ft high 10in width. After you ve brushed your slurry mixture onto the old concrete you can apply the new concrete that you mixed.

Pour the new concrete on top of the old concrete. The intend of the dowels are to pull together the old and new concrete together such that their bonding become inseparable. You can join the new concrete right to the old concrete this is called a concrete construction joint. When joining new concrete work to old concrete work the joint will always develop a crack and will be a point of expansion and contraction.

The new wall must sit on the same level foundation as the old wall. The question is how many pins diameter embedded depth lenght of pin spacing and grouting material. This footing will soon have a foundation wall on it directly over the keyway groove in the concrete. Some engineers require the edges of the existing footings and foundations where the new and old concrete meet be roughened.

Dump out all of the concrete onto the old concrete and spread it out with a hand trowel or a paver to form an even layer. Make sure the braces are level and lay down a barrier of wire mesh over the existing concrete inside of the barrier. Where no foundations exist the new wall will not be on solid footings and will sag or crack. A single wall no higher than 1 8 metres requires a 300mm deep x 300mm wide footing while a double wall or a wall higher than 1 8 metres should be 600mm deep x 300mm.

I imagine it requires grouted pins. Over time this expansion and contraction especially if they occur at different rates due to the sections of concrete being exposed to different temperatures will work the sections apart and the crack will widen. To lay new concrete sweep and clean the old concrete and saturate the old concrete with water. What is standard practice for joining a new poured concrete wall to an old poured concrete wall.