An insert with a steel disc, 25 mm in diameter at a depth of 25 mm, is cast into concrete. Once the concrete has hardened, the disc is pulled centrally against a 55 mm diameter counter pressure ring bearing on the testing surface. The force F required to pullout the insert generates compression stresses in the strut between the disc and the counter pressure ring. Loading is performed either to a required force, in which case the test is nondestructive, or to the peak-load, which results in a slightly raised, 55-mm diameter circular crack on the surface. If pulled out, the conical hole can be easily patched with a repair non-shrink mortar.

Pull out test.

• Determining whether in-place concrete strength is sufficient for timing of early and safe loading operations, such as due to formwork removal or application of prestressing.
• Determining whether the in-place strength is sufficient for terminating curing and thermal protection. 
• Quickly evaluating the quality of the critical cover layer protecting the reinforcement in the finished structure.
• Substituting laboratory testing cylinders or cubes for testing final strength of structures on-site. 

Pull out test.

• Handheld hydraulic pulling machine with electronic gauge. 
• Digital display resolution = 0.1 kN
• Maximum force: 100 kN 
• Maximum stroke: 6 mm
• Accuracy of measurements: ± 0.1 kN
• Operating conditions: -10 to 50°C, max. RH = 95%
• Memory capacity: 512 measurements (peak-value, time and date of testing)
• AMIGAS Software for PC communication and printout

LOK-TEST Kit

Includes:

Item Order # Hydraulic pull machine with electronic gauge L-11-1 AMIGAS Printout software L-13 Cable for printout L-14 Centering plate L-15 Coupling L-16 Pull bolt L-17 Stem removal tool L-18 Bolt handle L-19 Adjustable pliers L-20 Oil refilling cup L-24 Oil refilling bottle L-25 Large screwdriver C-149 Small screwdriver C-157 Calibration table L-32 Manual L-33 Attaché case L-34

Consumables:

Inserts

*For testing high strength inserts, a special high-strength pull bolt with flange is needed, L-17-1, along with the high-strength coupling device C-141. Undamaged inserts may be re-used provided the discs are thread locked to the stems and coated with a coating agent, L-29. 

To be ordered separately

Load Verification Unit

• Technical data sheet
• Publications

More documentation is available upon request.

• ASTM C900, Standard Test Method for Pullout Strength of Hardened Concrete.

• BS 1881-207:1992, Testing concrete. Recommendations for the assessment of concrete strength by near-to-surface tests.

• BS EN 12504-3:2005, Testing concrete in structures. Determination of pull-out force