| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. TEST SETUP & EQUIPMENT DETAILS | |||
| A1 | UPV Equipment Make & Model Acceptance: Portable UPV meter with digital display, frequency 54 kHz typical | Identification of ultrasonic pulse velocity meter | OK NC NA HOLD |
| A2 | Operating Frequency (kHz) Acceptance: Typically 54 kHz; note if different (20, 150, 250 kHz possible) | Transducer frequency used for testing | OK NC NA HOLD |
| A3 | Calibration Status Acceptance: Calibration valid, dated within last 12 months | Equipment calibration verification | OK NC NA HOLD |
| A4 | Calibration Bar Reading Check Acceptance: Reading within ±3% of bar's certified velocity (typically 4.5±0.2 km/s) | Verify equipment on standard calibration bar | OK NC NA HOLD |
| A5 | Transducer Type Acceptance: Proper contact, no damage, coupling medium applied | Type and condition of transducers (sender/receiver) | OK NC NA HOLD |
| A6 | Coupling Medium Acceptance: Grease, petroleum jelly, or approved couplant (not water for direct method) | Acoustic coupling material between transducer and concrete | OK NC NA HOLD |
| A7 | Test Method Selection Acceptance: Direct (opposite faces) | Indirect (adjacent faces) | Semi-direct (perpendicular faces) | Specify UPV measurement approach used | OK NC NA HOLD |
| A8 | Test Method Justification Acceptance: Direct: most accurate; Indirect: accessible surfaces; Semi-direct: corners/edges | Reason for selecting particular test method | OK NC NA HOLD |
| B. TEST GRID & LOCATION PLANNING | |||
| B1 | Element Dimensions Acceptance: Record for grid planning and path length calculation | Length, width, height (or thickness) of tested element | OK NC NA HOLD |
| B2 | Grid Point Spacing (mm) Acceptance: Typically 150-300 mm for structural elements (document spacing used) | Spacing between measurement points | OK NC NA HOLD |
| B3 | Total Number of Test Points Acceptance: Minimum 3-5 points per location; comprehensive coverage for large elements | Count of grid points to be tested | OK NC NA HOLD |
| B4 | Reinforcement Location Noted Acceptance: Record rebars crossing path (can increase velocity readings) | Identify reinforcement bars at test points | OK NC NA HOLD |
| B5 | Surface Condition Assessment Acceptance: Smooth, clean, free of coatings that affect coupling | Check test surface quality | OK NC NA HOLD |
| B6 | Surface Moisture Condition Acceptance: Record moisture state (affects velocity slightly) | Note if surface is dry, damp, or wet | OK NC NA HOLD |
| C. TEST RESULTS TABLE | |||
| C1 | Grid Point ID Acceptance: Clear labeling with grid coordinates or location description | Unique identification for each test point (e.g., P1, P2, P3...) | OK NC NA HOLD |
| C2 | Path Length (mm) Acceptance: Measured accurately (±2 mm); direct method typically 150-500 mm | Distance between transmitter and receiver transducers | OK NC NA HOLD |
| C3 | Transit Time (μs) - Reading 1 Acceptance: In microseconds; digital display accuracy ±0.1 μs | Time for pulse to travel path length (first reading) | OK NC NA HOLD |
| C4 | Transit Time (μs) - Reading 2 Acceptance: Average of 2-3 readings; discard outliers >5% deviation | Second transit time reading (repeat measurement) | OK NC NA HOLD |
| C5 | Average Transit Time (μs) Acceptance: Use for velocity calculation | Mean of multiple transit time readings | OK NC NA HOLD |
| C6 | Pulse Velocity (km/s) Acceptance: Result in km/s (typical 3.5-4.5 km/s for good concrete) | Calculate: Velocity = Path Length (m) / Transit Time (s) | OK NC NA HOLD |
| C7 | Quality Grading (IS 13311 Table 2) Acceptance: >4.5 km/s = Excellent | 3.5-4.5 = Good | 3.0-3.5 = Medium/Doubtful | <3.0 = Poor | Classify concrete quality based on velocity | OK NC NA HOLD |