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The SCHMIDT Hammer is the most frequently used method worldwide for non-destructive testing of concrete and structural components. It is best suited to relative concrete strength and quality. The Original Schmidt uses the original R value mechanism
Overview | GX1 vs GX2 | SUE & Utilities | Structures & Pavements | Software & Outputs | Case Studies | Specifications | Support
Collect high-density, georeferenced GPR data across wide areas and view the subsurface in 3D as you scan. Choose the GX2 array for SUE and utility mapping, or the GX1 array for structural, bridge and pavement investigations.
Best suited to:
Best suited to:
Recommended array: GX2
Recommended array: GX1
Cover more ground
Collect multiple parallel profiles in one pass instead of uilding a grid line by line.
See results during acquisition
View georeferenced radargrams and time-slice information in the field rather than waiting until the data is returned to the office.
Produce repeatable mapped data
Combine wheel-positioned GPR data with GNSS, project coordinates and survey linework.
Use one platform for two very different applications
Exchange GX1 and GX2 arrays without purchasing two complete cart platforms.
The GX2 transforms the GS9000 into a high-density subsurface utility mapping system. Its 11-channel, low-frequency GPR array captures an 83 cm-wide swath in each pass, helping operators detect and map buried pipes, ducts, cables, voids and other subsurface features. Live georeferenced data lets SUE teams review coverage on site and produce accurate CAD, GIS and project-coordinate deliverables.
1. Plan the survey
Load satellite imagery, CAD information, project coordinates or survey control.
2. Collect dense multichannel data
Survey an approximately 0.82 m-wide swath with 11 channels in each pass.
3. Review data live
Examine radargrams, georeferenced time slices and marked features while still on site.
4. Interpret and digitise
Add points, linework, tags, photographs and field observations.
5. Process and deliver
Merge survey areas, apply processing and export mapped information for the customer’s CAD, GIS or reporting workflow.
View the images below to see these in action.
Rebound test hammers are used to evaluate relative strength of concrete.
After the spring in the hammer is loaded, the test hammer strikes concrete at a defined energy.
The height of the rebounded mass is recorded and measured as an "R" value, this value is dependent on the hardness of the concrete.
By reference to conversion tables, the rebound value can be used to determine the corresponding compressive strength.
No other manufacturer offers such a broad range of impact energy and hardware types. Each hammer is designed for specific test applications.
The Original Schmidt Live, OS8000 is the original concrete test hammer by Proceq, now digitally redefined as the most advanced R-value hammer ever made, with unmatched performance, ease of use, and versatility.
Paired with a user-friendly mobile app, the Original Schmidt Live OS8000 increases operator productivity and makes instantaneous reporting possible, from anywhere, any time.
The Original Schmidt Live is available as a package combining the best in class hardware OS8000 and a 5 year subscription to the OS app. The App subscription may be continued after 5 years, or alternatively the Schmidt Hammer may be used only as a stand a lone device. This package also includes a 5 year electrical 6 month mechanical warranty.
The Original Schmidt mechanism is a pure mechanical design, with measurements based on a physical sliding indicator.
In addition to the modern data logging options, the same Silver Bullet mechanical design is manufactured to this day. Ideal for users who only need ocasional measurements, without recording their results.
When performing a Schmidt Hammer Test, it is critical that the hammer be held at right angles to the surface. The orientation of the Hammer will in turn affect the rebound reading, and different calibration curves are required by orientation.
Original Schmidt Type NR/ LR
With this model Rebound values are recorded as a bar chart on a paper strip. One roll of paper strip offers room for 4000 test impacts.
Type PT (Concrete Test Hammer)
Equipped with a larger plunger surface, it is especially designed to test on softer material such as light weight concrete, gypsum boards and on fresh concrete. It is often used to determine the right time to remove formwork.
Type PM (Mortar Test Hammer)
Designed to test the mortar joints in brickwork. It has a specially developed plunger whose shape ensures the impacts are applied to the surface of the joint, the contact point has a diameter of 8.0 mm. Based on the rebound values the mortar quality can be classified.
Each rebound hammer is built for a different purpose, the following table gives an overview of the standard strength ranges and applications for each instrument.
Type N
This is the workhorse of the range. With a measuring range 20 to 70 MPa compressive strength and impact energy of 2.2J, this hammer is sufficient for most engineering applications. Rebound values are read from a dial and converted to compressive strength using the graphic above it.
Type L
Also with a measuring range 20 to 70 MPa compressive strength, this hammer has an impact-energy, which is three times smaller than the Type N. These types are used for testing thin walled (< 100 mm) or small components but also cast stone components sensitive to impact.
Each test hammer should be checked after 1000 test impacts. A testing anvil is used to check whether the rebound test mechanism is working correctly.
Cleaning or inspection will be required in case of contamination by very fine cement or due to wear.
Book a SUE Workflow Demonstration
The GX1 transforms the GS9000 into a high-resolution structural assessment system for concrete slabs, bridge decks and pavements. Its dense, dual-polarisation array captures detailed 3D data across wide areas, supporting reinforcement and cover mapping, moisture and deterioration assessment, and analysis of asphalt and pavement layers. Live visualisation helps confirm survey coverage on site, while post-processing tools produce clear, report-ready condition maps.
1. Define the inspection area
Import the structure, bridge, pavement or survey background.
2. Collect closely spaced profiles
Capture 35 longitudinal and 15 cross-polarised channels with dense spacing.
3. Review coverage in the field
Use live radargrams and time slices to confirm that the required area has been captured.
4. Process the dataset
Apply velocity, gain, background removal, migration, filtering and topographic correction as appropriate.
5. Generate diagnostic maps
Create depth slices, reinforcement maps, layer information or application-specific condition maps.
6. Integrate with the engineering assessment
Export figures, mapped anomalies and raw data for inclusion in the engineer’s final interpretation and report.
Field information
Processed Diagnostic Information
Engineering deliverables
View some of these features at work below, and our case study if you'd like to see more of what the GS9000 can do.
Book a Structural Assessment Demonstration
GS9000 cart with:
This manual contains operation instructions and conversion curves for Proceq's Original Schmidt N and L
This document describes the process of creating a custom conversion curve for an Original Schmidt or Silver Schmidt Hammer.
