Schmidt Rebound Hammer

Schmidt Rebound Hammer – NDT Concrete Strength Testing

The Schmidt Rebound Hammer is the most widely used non-destructive testing (NDT) instrument for in-situ estimation of concrete compressive strength and concrete uniformity. JS Civil Lab Solutions supplies Type N and Type L rebound hammers by leading brands, along with anvil calibration blocks and carry cases for complete site-ready packages.

Principle of Operation

A spring-loaded plunger strikes the concrete surface and the rebound distance is measured on a linear scale (R-value). Higher R-values indicate harder, stronger concrete. The compressive strength is estimated from conversion charts (EN 13791, IS 13311, ASTM C805) or product-specific correlation curves.

Types Available

• Type N (Impact Energy 2.207 Nm) — Standard type for normal concrete (10–100 MPa)
• Type L (Impact Energy 0.735 Nm) — For thin elements, lightweight concrete, and concrete below 25 MPa
• Digital models — Auto-recording, Bluetooth, direct strength readout

Key Features

• Rugged, field-proven design for on-site concrete testing
• Anvil calibration block included for regular verification
• Quick, economical — entire slab or column surveyed in minutes
• No surface preparation required beyond light grinding
• Result logged for QA records

Applications

• Post-construction concrete strength verification
• Structural health monitoring of bridges, buildings, and dams
• De-shuttering decisions on construction sites
• Concrete homogeneity surveys for repair specification

Applicable Standards

IS 13311 Part 2, ASTM C805, EN 12504-2, BS 1881-202.

Call JS Civil Lab Solutions at +91 93596 24761 for model selection, calibration, and pricing.