Concrete

CONCRETE N – TYPE HAMMER

Concrete N-type test hammers, also known as Schmidt hammers or rebound hammers, are non-destructive testing devices used to estimate the compressive strength and uniformity of concrete.They operate by measuring the rebound of a steel plunger after striking the concrete surface, providing a quick and practical method for assessing concrete quality in-situ. 

Key Applications:
  • Strength Estimation:
    N-type hammers can provide a quick and cost-effective estimate of concrete compressive strength, though it’s important to note that a correlation needs to be established between rebound values and actual compressive strength. 

  • Uniformity Assessment:
    They can be used to identify areas of poor quality or deterioration in concrete structures by mapping the rebound values across the surface. 

  • Early Age Strength Determination:
    N-type hammers can be used to assess concrete strength before formwork removal or for other purposes where quick strength evaluation is needed, says Gilson Company. 

  • Quality Control:
    They provide a non-destructive method for monitoring concrete curing and ensuring that strength meets design specifications. 

  • Other Materials:
    While primarily used for concrete, some models can also be used to test the hardness of other materials like rock. 

How it Works:
  1. The hammer is pressed against the concrete surface, and a plunger is released, striking the concrete. 
  2. The rebound of the plunger after impact is measured and recorded as a rebound value. 
  3. This rebound value is correlated with the concrete’s compressive strength using a calibration curve or table,. 
  4. The hammer can also be used to map the uniformity of concrete by recording rebound values across the surface. 
Advantages:
  • Non-destructive: They don’t damage the concrete structure being tested. 
  • Quick and Easy: They provide rapid results with simple operation. 
  • Portable: They are typically lightweight and portable, allowing for on-site testing. 
  • Cost-effective: They are a relatively inexpensive method for assessing concrete strength. 

 

NON – DESTRUCTIVE TESTING

Used to obtain an estimate of strength and quality of hardened concrete.

Supplied complete with carborundum stone and plastic carrying case.

Strength range 10 to 70 N/mm2 (100 to 700 kgf/cm2)

 

Test Anvil

Made of special steel, for routine checks on concrete test hammer.

 

 

 

Click Below for Operating Manual:

CONRETE N-TYPE HAMMER