Concrete USPV Test
(Ultrasonic Pulse Velocity)

Assessment of concrete quality, homogeneity and estimated strength by measuring the travel time of ultrasonic pulses through concrete — detecting internal cracks, voids and variations in concrete quality.

Overview

What is the Concrete USPV Test?

The Concrete Ultrasonic Pulse Velocity (USPV) Test measures the time taken for an ultrasonic pulse to travel through a known length of concrete. The pulse velocity is correlated to concrete quality, compressive strength and homogeneity. Lower velocities indicate voids, cracks or poor consolidation; higher velocities indicate denser, better quality concrete.

Conducted as per IS 13311 Part 1 and ASTM C597, the USPV test is widely used for both quality control on new construction and condition assessment of existing structures. Global Lab uses calibrated digital USPV instruments with transducers optimised for both direct and indirect transmission modes.

Quality Assessment

Classifies concrete as excellent/good/doubtful/poor based on pulse velocity per IS 13311.

Void & Crack Detection

Detects internal voids, honeycombing and major cracks that are invisible from surface.

Strength Estimation

Velocity correlated to compressive strength when used alongside rebound hammer.

Three Transmission Modes

Direct, semi-direct and indirect modes for testing all structural configurations.

NABL Certified Reports

All results issued on NABL-accredited letterhead per IS 13311 / ASTM C597.

Grid-Mapped Reports

Results mapped as velocity contour plans for comprehensive structural assessment.

Test in Action

Concrete USPV Test — Site Images

USPV Transducers in Direct Transmission Mode

Engineer Recording Transit Time

Velocity Contour Map Generated on Site

Test Procedure

How the Concrete USPV Test is Conducted

1

Surface Preparation

Surfaces are cleaned and coupling gel is applied at transducer contact points to ensure good acoustic coupling.
2

Transducer Placement

Transmitter and receiver transducers are placed on opposite faces (direct), adjacent faces (semi-direct) or same face (indirect) depending on accessibility.
3

Pulse Transmission

An electronic pulse generator produces a high-voltage pulse through the transmitter transducer, launching an ultrasonic wave into the concrete.
4

Travel Time Measurement

The receiver transducer detects the pulse and the transit time (in microseconds) is measured and displayed digitally.
5

Velocity Calculation & Reporting

Pulse velocity = Path Length ÷ Transit Time. Velocity is classified per IS 13311 Table 1. NABL report with velocity contour map issued within 24 hours.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 13311 Part 1	Methods of Non-Destructive Testing of Concrete — Ultrasonic Pulse Velocity	USPV Test	Indian Standard
ASTM C597	Standard Test Method for Pulse Velocity Through Concrete	Pulse Velocity	ASTM
BS EN 12504-4	Testing Concrete — Determination of Ultrasonic Pulse Velocity	NDT	British Standard
EN 13791	Assessment of In-situ Compressive Strength in Structures	Strength Assessment	European Standard

Applications

Where is the CAPO Test Used?

Quality control of concrete placement in columns, beams, slabs and walls

Detection of internal voids, honeycombing and cold joints in concrete

Comparative assessment of concrete uniformity across large structures

Monitoring of setting and strength development of freshly placed concrete

Assessment of fire-damaged or chemically deteriorated concrete

Correlation with rebound hammer for more reliable strength estimation

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid certificates for all statutory and contractual requirements.

Digital USPV InstrumentsCalibrated instruments with automatic transit time measurement and logging.

Velocity Contour MappingColour-coded maps for easy identification of weak and strong zones.

Combined NDT PackageUSPV + Rebound Hammer + Half-Cell offered as a comprehensive site audit.

Pan-India CoverageField engineers across 7 lab locations for rapid site deployment.

Fast TurnaroundOn-site results immediately; formal NABL report within 24 hours.

Concrete USPV Test(Ultrasonic Pulse Velocity)