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Technology Factsheet

Concrete Spaller

Category: Decontamination > Mechanical Surface Removal > Milling/Shaving
Reference # : OST # 2152 Model No : SPALLER

The Concrete Spaller is a hand-held tool that can be used for decontaminating flat or slightly curved concrete wall and floor surfaces, obtaining concrete samples, and in-depth removal from cracks in concrete. The technology includes a 9-ton hydraulic cylinder and spalling bit. It runs from a hydraulic pump that expands the spaller in pre-drilled holes in the concrete. The concrete spaller is operated by drilling holes in the concrete in a honeycomb patter, then inserting the spaller bit and opening a hydraulic valve. Upon opening the valve, the bit expands almost immediately and the spalling occurs. The result is the removal of chunks that fall into the attached metal shroud that has a vaccum port for control of any airborne materials. Hose to the shroud vacuum port can be connected to a vacuum high-efficiency particulate air (HEPA) filtration unit. Dimensions of Tech Model (LxWxH): Spaller: 26 in x 8 in x 2.5 in Weight of Tech Model (lb.): Spaller: -30 Hydraulic pump: - 108

Benefits

Thoroughly decontaminates surfaces with very little dust production. Removes material to a greater depth than the baseline tools Less vibration for the operator than the baseline technologies Increased performance factor by 17 percent compared to scaler and scabbler (baseline) Spalling would be an effective technology for removing deep contamination in cracks and for taking concrete samples.

Limitations

Spalling is 40 percent slower than the diamond grinding for depths of up to 1/8 inch. Spalling leaves a much more uneven surface than the baseline The electric drill used for this demonstration was two to three times slower than the pneumatic drill used at a previous demonstration. The spaller weighs more than the baseline tools and was not supported by a sling.

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