The Special Inspector's job for concrete is typically a continuous inspection, meaning they must be present whenever critical work is being performed. Their responsibilities include:

• Reinforcement (Rebar) Inspection:

  • Verifying the type, size, quantity, and placement of reinforcing steel (rebar) against the approved plans.

  • Confirming the correct use of spacers and supports (chairs, bolsters) to maintain proper concrete cover and rebar position.

  • Inspecting all splices and laps to ensure they meet code requirements.

• Concrete Placement Observation:

  • Monitoring the actual pouring of the concrete to ensure proper placement techniques are used, such as controlling the rate of pour and minimizing segregation.

  • Verifying that the concrete is properly vibrated to eliminate voids and achieve consolidation.

• Material Verification and Testing:

  • Confirming the correct mix design (compressive strength, slump, air content) is delivered to the site.

  • Performing on-site slump and air content tests and determining the temperature of the concrete.

  • Fabricating concrete test cylinders (samples) that will be laboratory-tested at 7 and 28 days (or as specified) to confirm the concrete meets the specified compressive strength 

• Formwork Inspection:

  • Checking the formwork (molds) for proper alignment, bracing, and stability before concrete is placed.

• Post-Placement Oversight:

  • Verifying that the specified curing procedures (e.g., proper moisture and temperature control) are maintained to allow the concrete to achieve its full strength.

Qualifications

A Special Inspector for concrete typically holds an ICC Reinforced Concrete Special Inspector certification and may also require a specific certification from the American Concrete Institute (ACI Concrete Field Testing Technician Grade I) to perform the required material testing and sample fabrication.