- Concrete Demolition Home
- Conditions calling for concrete removal and replacement
- Is it worth fixing?: Deep cracks, sunken concrete, and frost heave may require concrete removal
- Overview of Concrete Demolition Methods
- Pneumatic and hydraulic breakers
- Pressure bursting
- Dismantling: Sawing, water-jet cutting, or thermic lance
- Ball and crane
- Demolition Tools and Materials
- Demolition hammer
- Diamond wire saw
- Hydraulic concrete crusher
- Hydraulic splitter
- Pavement breaker
- Chipping hammer
- Rotary hammer
- Hydraulic hammer
- Mounted breakers
- Expansive demolition agents
- Pneumatic hammer
- What to Do with Demolished Concrete
- The benefits of recycling concrete from a demolition project
- Urbanite: Repurposing Old Concrete
- Avoiding Hazards During Concrete Removal
- Safety considerations prior to demolition
- Concrete demolition unknowns: How to avoid unwanted surprises
- Hand tool hazards
- Power tool hazards
- Machine-mounted tool hazards
- Tips for dressing properly
- Permitting Requirements for Concrete Demolition: General Guidelines
- When is a demolition permit required?
- Why are demolition permits required?
- Who can apply for a demolition permit?
- What does the demolition permit cost?
- What is involved in the typical demolition permit process?
- What is involved in the demolition inspection process?
Concrete Demolition Method - Pressure Bursting
Pressure bursting can be used in cases where relatively quiet, dust-free, controlled demolition is preferred.
Both mechanical and chemical pressure bursting split the concrete, either with a splitting machine operating on hydraulic pressure provided by a motor in the case of mechanical bursting, or through the insertion of an expansive slurry into a pre-determined pattern of boreholes in the case of chemical bursting.
The split concrete is then easily removed, either by hand or by crane.
Hydraulic and chemical pressure bursting break up concrete structures with a minimum of noise and flying debris. Both methods work by applying lateral forces against the inside of holes drilled into the concrete, and can do virtually any job other demolition methods are capable of. However, rather than shattering the concrete into bits as dynamite and impact tools would, the lateral forces build up over time to crack the concrete into smaller sections.
Mechanical bursting highlights
- Inexpensive, quiet, no vibration
- Initial drilling of holes for splitter does produce some noise and vibration
- Diamond-tipped coring machine greatly reduces noise and vibration during hole drilling, but is much more expensive
- Controlling crack direction and movement of demolished concrete can be difficult
- Hand-held or machine-mounted breaker may be needed to expose reinforcing bars for cutting
Chemical bursting highlights
- More costly method of pressure bursting
- Can split concrete in a controlled manner
- In excess of 4300 psi of expansive pressure may be generated to produce concrete cracking within 10 to 20 hours
- Quiet, no vibration, little or no dust
- Temperature sensitive freezing greatly reduces effectiveness