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SPECIAL INSPECTIONS

Concrete Inspections

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Concrete inspection may primarily invoke images of cylinders being prepared,but the variety and depth of concrete inspections required for a project can be vast. To satisfy codes and job specifications, design professionals may require the special inspection of concrete construction procedures before, during, and after placement..

When most people think of concrete inspection, it is hardly surprising if the first thing that is thought of is “the guy making the cylinders”. Contrary to popular perception, there exists a wide variety of testing and inspection which is required when a proper inspection is being performed. AEIS can provide qualified and certified inspectors with calibrated equipment to perform all the required tests involving concrete. Some of the steps involved for concrete inspections are:

  • Become familiar with the project requirements to verify that the concrete is the correct class for the structure which the concrete is being placed.
  • Request client to provide access to approved contract drawing to reference within inspector’s report the exact structure which is being placed with clear and definitive location references (specific to column lines, elevations, structure type etc.).
  • A location which is a safe distance away from the discharge chute of the trucks must be selected for the inspector to set up a flat and clean area where all testing can be performed.
  • The inspector must use the batch ticket to verify the time the batch process started in order to confirm that the discharge is within ACI and/or specification requirements and that the proper class of concrete has been delivered.
  • The contractor must provide a wheelbarrow for the inspector to transport the fresh concrete from the truck to the testing location.
  • From the fresh concrete, the concrete inspector will perform, at a minimum, the tests for verifying Temperature, Unit Weight, Slump, Air Content.
  • Cast cylinders and/or flexural beams for compressive/flexural strength testing
  • Placing samples in a curing box (to be provided by contractor) until scheduled pick up
  • Perform concrete placement inspectionsthat includeformwork and reinforcement (performed prior to and during placement) as well as visual inspections to verify all embedments are securely in place.Verify that all steel reinforcementsare in place with anchor bolts as per details, manufacturer instructions, and specifications. Check that formwork has been properly placed, water stopshave been set as needed, vapor barriers are in place as detailed, and the placement area has been cleaned to accept the concrete.

Occasionally specifications will require microwave testing, chloride ion testing, straightedge testing,dryingshrinkage testing, or a variety of other tests to meet the requirements of your project.

Additionally, in hot and cold weather, AEIS will verify protection placement to protect the concrete from overheating or freezing and that submitted methods are being followed. It is recommended that the contractor follow guidelines and recommended methods provided by ACI; however, it is the contractor’s responsibility to select the method of maintainingan acceptable temperature during the placement and initial curing stage.

Concrete materials such as self-consolidating concrete, shotcrete, or concrete that contains additives that reduce shrinkage, increase waterproofing capacities etc.; all these and other types of concrete or concrete admixtures may require specific testing needs.

Other services can be performed to meet the needs of your project. Engage with an AEIS expert to discuss your project requirements and ensure a smooth inspection process.

Services

Some of the inspection services and field tests that can be performed are:

  • Concrete Batch Plant Inspection
  • Concrete Field Inspection and Tests (Sampling, Slump, Air, Weight)
  • Concrete Placement
  • Concrete Reinforcement Inspection
  • Concrete Precast Shop Inspection
  • Concrete Precast Installation Inspection
  • Pre-stressed Concrete Inspection (Shop/ Field)
  • Concrete Temperature Monitoring
  • Concrete Maturity Determination
  • Concrete Coring
  • Concrete Microwave Testing
  • Concrete Chloride Ion Testing
  • Concrete Straight Edge Testing
  • Concrete Smoothness Testing
  • Concrete Floor Flatness/ Levelness (FfFl) Testing (ASTM E1155)

Codes, Standards & Specifications

Typical Concrete references in project specifications:

  • New York State DOT Section 500: Portland Cement Concrete Specifications.
  • New York City Building Code.
  • American Concrete Institute Standard (ACI).
  • ASTM C31 / AASHTO T23: Standard Practice for Making and Curing Concrete Test Specimens in the Field.
  • ASTM C 138 / AASHTO T121: Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete.
  • ASTM C143 / AASHTO T119: Test Method for Slump of Hydraulic-Cement Concrete.
  • ASTM C172 / AASHTO R60: Practice for Sampling Freshly Mixed Concrete.
  • ASTM C173 / AASHTO T196: Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method.
  • ASTM C231 AASHTO T152: Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.
  • ASTM C1064: Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete.
  • ACI 117: Specification for Tolerance for Concrete Construction and Materials.
  • ACI 305R: Hot Weather Concreting.
  • ACI 306R: Cold Weather Concreting.
  • ACI 318: Building Code Requirements for Structural Concrete.
  • ACI 347: Guide to Formwork for Concrete


New York City Building Code section references (Partial listing):

  • 2008 NYC BC 1704.4  Concrete Construction.
  • 2014 NYC BC 1704.4 Concrete Construction.
  • 2008 NYC BC Table 1704.4 Required Verification and Inspection of Concrete Construction.
  • 2014 NYC BC Table 1704.4 Required Verification and Inspection of Concrete Construction.
  • 2008 NYC BC Chapter 19: Concrete.
  • 2014 NYC BC Chapter 19: Concrete.

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