Dig about 1 foot inward.
Cheap ways to break up concrete.
Over the next 24 hours the agent expands with about 18 000 lb.
Holes drilled in the concrete.
The water is directed at the concrete at 20 000 psi and 10 to 15 gallons per minute for handheld guns.
Hydrodemolition is done with various devices from handheld guns to robotic equipment.
If the concrete is too thick to break up with a sledgehammer you can use an electric jackhammer instead.
Dig under the concrete.
For thin slabs of concrete use a sledgehammer to break it up.
Start to break the concrete starting six inches from the edge and working your way in.
A sledge can be surprisingly effective in breaking up concrete up to about 4 in.
It can cut clean lines or remove the surface as deeply as desired.
For slabs less than four inches thick use a sledgehammer.
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.
Pry off stubborn pieces.
Give it a try first before moving on to heavier rental equipment.
To break up concrete start by covering the concrete with a plastic sheet to protect nearby items from flying debris.
Move the concrete chunks with a hand truck.
These chemical powders are mixed with water and poured into 1 1 2 in to 2 in dia.
For more than four inches thick use a demolition hammer.
Dig out the soil gravel or other material from under the concrete using a shovel and a pickax.