Sandblasting (also called abrasive or media blasting) is the most effective surface preparation method that uses a high-pressure stream of abrasive material—typically steel slag, garnet, sand, or other media—to remove contaminants, laitance, and weak surface layers from concrete. It is widely used to prepare concrete surfaces for coatings, overlays, or sealants and to achieve various levels of surface texture or exposed aggregate finish for an architectural finish.

At Culwell Abrasive Inc., we specialize in precision concrete sandblasting, delivering superior surface preparation for a wide range of applications. With extensive experience in both commercial and residential projects, our team is skilled in achieving a variety of finishes — from light to medium to heavy profiles — tailored to the specific requirements of each job.

We approach every project with a deep understanding of surface profiles, concrete behavior, and abrasive blasting techniques. Our equipment is modern, efficient, and well-maintained, ensuring consistent results and minimal disruption to surrounding areas.

We pride ourselves on delivering clean, uniform finishes that meet industry standards for surface profile (CSP) levels, ensuring proper adhesion and long-term performance for whatever comes next — coatings, stains, sealers, or overlays. Safety, precision, and quality are at the core of every project we undertake.

With a proven track record and a commitment to craftsmanship, Culwell Abrasive Inc. is the trusted choice for concrete sandblasting that meets both functional and aesthetic goals.

Purpose of Sandblasting in Concrete Preparation

1. Coating Preparation:
   • Removes surface contaminants such as dirt, oil, old paint, and curing compounds.
   • Creates a clean, profiled surface that enhances mechanical adhesion for coatings, epoxies, or sealers.
2. Amplitude Profiling (CSP – Concrete Surface Profile):
   •   Sandblasting achieves varying levels of surface roughness or amplitude, depending on the technique and media used. These levels are commonly described by the International Concrete Repair Institute (ICRI) Concrete Surface Profile (CSP) scale, which ranges from CSP 1 (smooth) to CSP 10 (very rough).
3. Exposed Aggregate Finishing:
   • Selectively removes the cement paste from the surface to expose the underlying aggregate for architectural or decorative purposes.
   • Levels of exposure can be controlled and are commonly categorized as:
     • Light Exposure: Fine removal of surface paste, exposing the tips of the aggregate; texture is subtle and ideal for light decorative finishes.
     • Medium Exposure: More cement paste is removed; aggregate is clearly visible and evenly exposed.
     • Heavy Exposure: Significant paste removal, with coarse aggregate fully revealed and sometimes slightly recessed; creates a pronounced texture.

Levels of sandblasting intensity