Assess concrete quality without destruction
UPV Testing
Ultrasonic Pulse Velocity (UPV) testing measures the speed of ultrasonic pulses through concrete to assess its quality, uniformity, and integrity. The technique is governed by AS 1012.14 and ASTM C597, providing a quantitative, non-destructive measure of concrete condition.
Higher pulse velocities indicate denser, better-quality concrete, while lower velocities suggest the presence of voids, cracks, honeycombing, or deterioration. By mapping UPV readings across a structural element, we identify areas of concern for targeted further investigation.
SiteOps combines UPV with complementary NDT techniques — GPR for rebar mapping, thermography for moisture detection, and rebound hammer testing for surface hardness — to build a comprehensive picture of structural condition without invasive testing.
UPV is particularly valuable for post-fire assessment, where it distinguishes heat-damaged concrete (reduced pulse velocity) from unaffected concrete. Systematic UPV mapping across fire-affected elements defines the boundary between zones requiring remediation and zones suitable for retention.
Key Features
- •Concrete quality and uniformity assessment
- •Internal crack and void detection
- •Compressive strength estimation (with core correlation)
- •Fire damage severity mapping and boundary delineation
- •Honeycombing and segregation detection
- •Long-term deterioration monitoring via repeat surveys
- •Crack depth estimation using indirect transmission
- •Repair bond quality verification
Standards
Applications
- •Post-fire structural assessment
- •Concrete quality verification
- •Heritage masonry assessment
- •Bridge pier investigation
- •Precast element QA
- •Deterioration mapping
- •Repair verification
- •Forensic investigation
Stack & equipment
Technologies used
Case experience
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Common questions about UPV Testing
How accurate is UPV for determining concrete strength?+
UPV does not directly measure compressive strength — it measures pulse velocity, which correlates with concrete quality. Strength estimation from UPV alone has an uncertainty of ±20–30%. SiteOps uses UPV as a quality indicator and uniformity mapping tool, always correlating with core test results for definitive strength assessment. The value of UPV is comparative — identifying which zones are weaker relative to other zones.
Can UPV assess fire-damaged concrete?+
Yes. UPV is one of the most effective tools for post-fire assessment. Concrete exposed to temperatures above 300°C shows measurable reduction in pulse velocity due to internal microcracking and dehydration. By mapping UPV across fire-affected elements, SiteOps delineates the boundary between heat-damaged zones and unaffected zones. This mapping guides the extent of demolition and repair.
How long does UPV testing take on site?+
A single UPV measurement takes approximately 30 seconds. For a typical structural element assessment with 20–30 test points, site work takes 1–2 hours. A full-building UPV survey mapping multiple elements typically requires 1–3 days depending on building size and access logistics.
What is the difference between UPV and Schmidt hammer?+
UPV assesses the full cross-section of concrete by sending pulses through it, detecting internal defects and quality variation. Schmidt hammer tests only the surface 30–50mm, measuring hardness as a proxy for quality. SiteOps often uses both — Schmidt hammer for rapid screening of large areas, UPV for detailed assessment at locations identified by screening.
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