Overview of Concrete Demolition Methods

Demolition means d?smantl?ng, scraping, destroy?ng or wreck?ng any building or structure or any part of the building by a pre-planned and controlled method. Also, it means bringing down the building and other structures safely. Demolition can be either total or partial. Total demolition is aimed at recovering the area for subsequent re-use, while partial demolition can be aimed at recovering the building for refurbishing or rebuilding.

Several conditions, like deep widespread crack concrete slabs that have sunk, require concrete removal and replacement. Usually, patching the concrete before resurfacing is considered a short-term fix as it later displays the characteristics of the damaged concrete you tried to repair. Under such conditions, concrete demolition and replacement are often the best-recommended methods to ensure that repair work is done from scratch and that it is firm enough to last for long. 

Also, the structures which have already passed their design life need to be reconstructed for safety and operational requirements. Old structures need to be destructed for replacement by new structures. Perhaps you are already wondering what the best methods for concrete demolition are. Well, in that case, this article is for you. We will teach you some of the best concrete demolition methods you should know. Please ensure to read to the end for more information. 

Pressure Bursting

Pressure bursting- mechanical and chemical is the best option when a dust-free, controlled, and relatively quiet concrete removal is required. Holes are created into the concrete, and lateral forces are applied in both cases. In mechanical bursting, the concrete is separated with a hydraulic pressure machine. While in chemical bursting, concrete is divided through the insertion of an expansive slurry. Once divided, the concrete is then removed with a crane or by hand.

Pneumatic and Hydraulic Breakers

This method is usually used in demolition projects involving foundations, pavements, and bridge decks. The work achieved on this method will depend solely on the strength of the concrete, the amount of steel reinforcement, the hammer size, and working conditions.

Machine-mounted pneumatic and hydraulic breakers can deliver from 100 to 20 000 foot-pounds at just 300 to 800 blows per minute. Breakers also use remote control operation telescoping boom for maneuverability and reach. Underwater concrete demolition capabilities ensure that maximum work is accomplished quickly and hassle-free.

Dismantling

A saw, thermal lance, or high-speed water jet can be used to cut the concrete element. After that, the concrete pieces are removed by crane, allowing the complete demolition of a structure with little noise, dust, and minimal impact on the surroundings. This method is best used when building portions like slabs or walls are being removed.

Explosives

Explosives are used to remove a large amount of concrete. They are inserted and discharged in a series of predefined boreholes, causing the structure to break into smaller pieces. This method is very flexible and versatile; however, if not adequately controlled, the blast and vibration from the explosion can cause damage to the surrounding structures. Explosives have the most restrictive safety regulations among all demolition methods.

Conclusion

Concrete demolition is necessary for many situations, such as major renovation projects or when the material is damaged beyond repair. Different methods are available, and each has its advantages and disadvantages. However, the best option will depend on the project’s needs and surroundings.