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Why Non Destructive Testing of Concrete

In-place testing of hardened concrete is also required to assess structure’s suitability for its intended use. Non-destructive testing techniques are used by measuring the strength and other properties such as steel corrosion, permeability, cracking, and void structure to assess concrete properties. For the assessment of both new and old systems, this form of testing is significant. The key applications for new architectures are primarily used to assess mate efficiency.

The Benefits of Non-Destructive Testing

Non-destructive testing can also be used as an initial step to subsequent coring and more invasive measures such as:

  • Gauging characteristics of pre-cast, cast-in-place, or in-situ construction
  • Determining the acceptability of supplied material and components
  • Locating and categorizing cracks, voids, honeycombing, and other defects in a concrete structure
  • Determining the concrete uniformity prior to core cutting, load testing, or other more expensive or disruptive tests
  • Monitoring strength development related to formwork removal, cessation of curing, and load application
  • Determining the position, quantity, or condition of reinforcement
  • Confirming or locating suspected deterioration of concrete resulting from such factors as overloading, fatigue, external or internal chemical attack or change, fire, explosion, environmental effects
  • Assessing the potential durability of concrete while monitoring long-term changes in properties

The Methods of Concrete Testing

  • Ultrasonic pulse velocity (UPV) test that provides crucial information about the integrity of the concrete structure and is typically used to identify the presence of voiding, cracking, honeycombing and sound concrete.
  • Rebound hammer that measures the “Q value’’ at the in-situ concrete surface which is then converted via a calibration curve to determine the indicative concrete strength about the concrete surface.
  • Ground Penetrating Radar (GPR) that is used over large areas of concrete to map the internal steel reinforcement, identify voiding and/or quantify the likelihood of corrosion to the internal steel reinforcement.
  • Ultrasonic Array Pulse equipment that can detect and locate defects in reinforced concrete such as honeycombing, voiding and the depth and extent of concrete delamination. This equipment is also used for the detection of embedment’s such as pipes, tendon ducts beneath a layer of rebar.

Selecting of the test method

Rebound hammer, penetration resistance, pull out and ultrasonic methods can be used to estimate concrete strength. So far no NDT methods can give the best estimation. However the popular combination for strength estimation is rebound hammer and ultrasonic testing. Ultrasonic is among the widest applications. It can be used for estimation of strength, elastic modulus, thickness and crack depth using conventional ultrasonic pulse velocity (UPV) method. Using advanced ultrasonic method such as multi array transducer, it can detect void, honeycomb, lamination and bar location. Ultrasonic is the only
NDT method for crack depth measurement.

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