Original Schmidt Hammer: Rebound, Type N
The Original Concrete Schmidt Hammer is the classic analog rebound hammer for accuracy, reproducibility and reliability. It’s a fast, non-destructive method for compressive strength of hardened concrete, concrete uniformity and rock hardness.
Digital systems like the Schmidt Live have automatic calculations for various Schmidt test parameters including impact angle correction to improve non destructive testing methods.
The Schmidt hammer is the most popular and cost effective way to test concrete structures strength, integrity and uniformity. Designed for testing concrete 4 inches (100 mm) or more in depth, it’s a must have tool for professionals in the construction and civil engineering industry in the USA and beyond. For concrete with correlation curves and the cross-section less than 4 inches (100 mm) see the HM-75L Original Schmidt Hammer, Type L, with 0.735 Nm (0.54 ft-lb) low impact energy for better reproducibility.
Specifications:
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Overall length: 11.1 inches
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Width: 2.2 inches
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Height: 2.2 inches
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Weight: 3.3 lbs
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Impact energy: 2.207 Nm (1.63 ft-lb)
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Compressive strength range: 1450 - 10,152 psi (10 - 70 MPa)
Features:
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Time-tested, Swiss-made design
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Reliable and reproducible results for non destructive testing
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Works on concrete with compressive strengths from 1,450 to 10,152 psi (10 to 70 MPa)
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For concrete 4 inches (100 mm) or more in depth
Included Items:
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Original Schmidt Concrete Schmidt Hammer (Type N)
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Plastic carrying case
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Carborundum stone for surface preparation
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Reference chart
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Certificate of conformity
These concrete testing hammers come with everything you need to calibrate them. The plastic carrying case protects the hammer and its accessories during transport, perfect for field use. The carborundum stone prepares the concrete structures for accurate and consistent Schmidt test results.
Our Type N Concrete Schmidt Hammers meet:
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ASTM C 805
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BS 1881-202
Applications and Usage:
The Original Schmidt Concrete Hammer is used in the USA and worldwide to test strength and uniformity of concrete structures in buildings, bridges and pavements. Non destructive testing makes it perfect for in-place testing of concrete structures without damaging the foundations.
See the full range of Schmidt Concrete Hammers and Non-Destructive Testing (NDT) concrete equipment and boost your testing capabilities with our wide range of tools and accessories for accuracy and durability.
Rebound hammers, also known as Schmidt hammers or concrete hammers, are essential tools to estimate the mechanical properties of concrete and rock materials. These non destructive testing devices measure surface hardness and penetration resistance by bouncing a spring-loaded mass against the material’s surface. The rebound values obtained from this process is then used to calculate the compressive strength of the material. We offer several models, including the Original Schmidt Hammer, Silver Schmidt, and Schmidt Live, each designed with varying impact energy and features to meet your specific needs.
Operating Principle
The operating principle of a Schmidt hammer is based on the measurement of the rebound from a controlled impact on a surface. The device has a spring-loaded piston that when pressed perpendicularly against a surface releases onto a plunger. During this impact some of the energy is absorbed and transformed into heat and sound and the rest is the impact penetration resistance or hardness of the surface. The harder the surface the higher the rebound value. The Schmidt hammer measures this rebound value on a arbitrary scale from 10 to 100 and gives a reliable indication of the surface hardness and compressive strength.
Applications
Schmidt hammers have many applications across various fields:
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Concrete Structures: Used to estimate the compressive strength of concrete structures such as buildings, bridges and roads, Schmidt hammers provide a quick and non-destructive way for testing concrete structures and their integrity.
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Rock Material Characterization: In geology and construction Schmidt hammers are used to estimate the mechanical properties of rock materials, surface hardness and penetration resistance.
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Geomorphological Research: In geomorphological studies Schmidt hammers are used to test the compressive strength of bedrock and boulder surfaces to understand landscape formation and erosion processes.
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Paper and Mortar Testing: In addition to concrete and rock, Schmidt hammers are also employed to assess the hardness of paper and mortar materials, showcasing their versatility.
Maintenance and Repair
To ensure the accuracy and durability of Schmidt hammers maintenance and repair is key. Here are some tips:
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Calibration: Calibration with a calibration test anvil supplied by the manufacturer is essential to keep the hammer accurate.
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Cleaning: Regular cleaning prevents dirt and debris from affecting the hammer’s performance and results.
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Storage: Store in a dry and safe place to prevent damage and extend the life of the hammer.
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Repair: Repair by a qualified technician if damaged to keep the hammer
By following these maintenance and repair guidelines, users can ensure their Schmidt hammers deliver precise and reliable testing concrete for years to come.