The water is directed at the concrete at 20 000 psi and 10 to 15 gallons per minute for handheld guns.
Cheap ways to break up concrete.
If the concrete is too thick to break up with a sledgehammer you can use an electric jackhammer instead.
Start to break the concrete starting six inches from the edge and working your way in.
To break up concrete start by covering the concrete with a plastic sheet to protect nearby items from flying debris.
Breaking stone or concrete this way is clean quiet safe controllable and relatively inexpensive.
Dig about 1 foot inward.
Pry off stubborn pieces.
To aid in breaking up the concrete use a spud bar in conjunction with the jackhammer.
For thin slabs of concrete use a sledgehammer to break it up.
It can cut clean lines or remove the surface as deeply as desired.
A sledge can be surprisingly effective in breaking up concrete up to about 4 in.
The surest way to decide whether to use a sledgehammer or a jackhammer is to experiment a few days before you begin full scale demolition.
Dig out the soil gravel or other material from under the concrete using a shovel and a pickax.
Holes drilled in the concrete.
Jam the flat end of the spud bar into the cracks formed by the jackhammer firmly grip the handle with both hands and use leverage to pry chunks of concrete from the pad for removal.
For slabs less than four inches thick use a sledgehammer.
Give it a try first before moving on to heavier rental equipment.
These chemical powders are mixed with water and poured into 1 1 2 in to 2 in dia.
Move the concrete chunks with a hand truck.
Dig under the concrete.