Non-Destructive Testing (NDT) Concrete Methodology
Non-Destructive Testing (NDT) allows accurate evaluation of in-situ concrete compressive strength, internal integrity, voids, and corrosion levels without damaging the structural elements. Shantal Engineers maintains an advanced in-house suite of calibrated NDT instruments.
1. Digital Schmidt Rebound Hammer Test (IS 13311 Part 2)
Measures surface hardness of concrete members. When the spring-loaded hammer strikes the concrete surface, the rebound distance provides an empirical indicator of concrete compressive strength across columns, beams, and slabs.
2. Ultrasonic Pulse Velocity (UPV) Test (IS 13311 Part 1)
Measures the transit time of ultrasonic sound pulses passing through concrete. Higher pulse velocity (>3.75 km/sec) indicates dense, homogeneous concrete, while lower velocities detect honeycombing, internal voids, micro-cracks, and delamination.
3. Rebar Locator & Cover Meter Survey
Utilizes electromagnetic pulse technology to accurately locate embedded reinforcement bars, determine concrete cover thickness, verify rebar spacing, and measure rebar diameter without breaking concrete.
4. Carbonation Depth & Chemical Analysis
Treated with 1% phenolphthalein indicator solution on freshly exposed concrete. Determines the depth of atmospheric carbon dioxide penetration, indicating whether the protective alkaline passivity layer around the steel rebar has been neutralized, leading to active rusting.
Methodology Workflow Diagram
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