Glossary
NDT
Plain-Language Definition
Non-Destructive Testing — inspection methods that assess the condition of building materials and structures without causing damage. Used to evaluate concrete strength, steel integrity, weld quality, and hidden defects.
Technical Context
Common NDT methods for buildings: Rebound Hammer (concrete surface hardness → estimated strength), Ultrasonic Pulse Velocity (concrete quality/cracks), Cover Meter (rebar location and cover depth), Core Testing (extraction for lab compression test — minimally destructive), Ground Penetrating Radar (locate rebar, voids, utilities), Thermography (thermal bridges, moisture, electrical hotspots).
Why It Matters
NDT allows assessment of existing structures without demolition or damage. In Bangladesh, where construction quality is variable and documentation often missing, NDT is the primary way to verify actual concrete strength and reinforcement. Core testing can confirm whether specified 30 MPa concrete was actually achieved.
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