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NDT TESTING

WHAT IS NON DESTRUCTIVE TESTING (NDT)

Non Destructive Testing (NDT) is a way of Testing without destroying the construction. This Means the Component Can continues to be used and the non-Destructive Testing Method can be done without any harming to the construction.


WHY NON DESTRUCTIVE TESTING

Mainly due to lack of proper Quality Control at site & Supervision during the Course of Construction. Sometimes Manner of Preparation is not good and material quality may be poor


TYPES OF NON DESTRUCTIVE TESTING

  • Rebound Hammer Test.
  • Ultrasonic Pulse Velocity Test
  • Half Cell Potential Test
  • Cover Meter Test
  • Carbonation Depth Measurement
  • Chloride Determination Test
  • Concrete Core Test

CARBONATION OF CONCRETE

For assessment of possibility of corrosion of reinforcement.

Carbonation of concrete in cover results in loss of protection to the steel against corrosion. The depth of carbonation can be measured by spraying the freshly fractured concrete surface with a 0.2% solution of phenolphthalein in ethanol. Since phenolphthalein is a pH indicator, the magenta (pink colour) area presents noncarbonated concrete and the remaining (colourless) portion, the carbonated area.


HALF – CELL POTENTIOMETER TEST

The instrument measures the potential and the electrical resistance between the reinforcement and the surface to evaluate the corrosion activity as well as the actual condition of the cover layer during testing. The electrical activity of the steel reinforcement and the concrete leads them to be considered as one half of weak battery cell with the steel acting as one electrode and the concrete as the electrolyte. The name half-cell surveying derives from the fact that the one half of the battery cell is considered to be the steel reinforcing bar and the surrounding concrete. The electrical potential of a point on the surface of steel reinforcing bar can be measured comparing its potential with that of copper – copper sulphate reference electrode on the surface. Practically this achieved by connecting a wire from one terminal of a voltmeter to the reinforcement and another wire to the copper sulphate reference electrode. Then generally readings taken are at grid of 1 x 1 m for slabs, walls and at 0.5 m c/c for Column, Beams.


DETERMINATION OF FIELD DENSITY TEST OF SOIL BY CORE CUTTER METHOD

Core Cutter Method of Field Density test is conducted in the field to know whether the specified compaction is achieved or not.

The core cutter method is a test used to determine the in-situ dry density of soil. It is only used in fine-grained cohesive soils without stones. The test requires cylindrical core cutters about 130 mm long and 100 mm in diameter. The bulk density of soil can be easily calculated using this method.


FIELD DENSITY OF SOIL BY SAND REPLACEMENT

Sand replacement density (SRD) tests are used to measure the in-situ density of natural or compacted soils using sand pouring cylinders. The in-situ density is typically used for highway or pavement design purposes to estimate the relative density of base course or subgrade materials.