The Benefits of Bridge Shot Blasting

Goethals Bridge

When it comes to dealing with bridge surface preparation, Shot Blast Inc. has enough experience to create superior surfaces that can endure for years. When a bridge is rebuilt, the top 2–5 inches of concrete must be removed through concrete scarification. This results in micro-fracturing of the concrete surface, leaving a weak layer.

The only solution – shot blasting. We remove micro-fractured concrete by shooting high velocity steel balls at the surface, like we did on the Delaware Memorial Bridge. As a result, we eliminate micro-fractured concrete and contamination.

Each project has unique specifications, with varying grades (from coarse to very fine) and intensities of shot blasting. After this process, we then magnet-sweep the surface to remove excess steel and use high-powered blowers to prepare for resurfacing.

Job Specification and Surface Examination Checklist

  • Bridge Shot BlastingDetermine if job specifications are in alignment with expectations of the project engineer.
  • Create a detailed proposal that includes cleaning methods, concrete surface profile, and surface defect repair procedures.
  • Check current surface for existing sealers, curing materials, grease, oil, efflorescence, traffic lines, tar, and dirt. All of these existing materials need to be stripped prior to the installation of a new concrete surface.

Concrete Repair Guidelines

The International Concrete Repair Institute (ICRI) has created a guideline called, “Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, and Polymer overlays.” It provides concrete surface profiles (CSP) that are used under the following conditions:

  • Concrete Surface ProfileLight Shot Blast (CSP 3): coating applications from 4–5 mils in thickness
  • Medium Shot Blast (CSP 4 or 5): coating applications from 15–50 mils in thickness
  • Medium-Heavy Shot Blast (CSP 5 or 6): coating applications from 40 mils to 1/8″ in thickness
  • Heavy Shot Blast (CSP 6 or 7): topping applications from ¼” to ½”
  • Extreme Shot Blast (CSP 8 or 9): concrete overlays greater than  ½”

For more information about our bridge surface services, view our PDF brochure.

Download the Guideline Instructions for Concrete Surface Preparation.

Call in a Concrete Resurfacing Contractor

Looking for bridge resurfacing in your area? Shot Blast Inc. is a concrete shot blasting company consisting of professional concrete resurfacing contractors who service NJ, PA, DE, MD and beyond.

Contact us today for a quote!