Automatic Concrete Cube Testing Machine Selection Guide
Match an automatic concrete cube testing machine to the cube dimensions, expected failure loads, governing method and daily laboratory workflow before choosing 2000 or 3000 kN capacity.
Calculate the cube failure load before selecting capacity
For a cube loaded on a square face, estimated failure load in kN equals compressive strength in MPa multiplied by side length squared in mm², divided by 1000. Use the highest credible strength at the test age and include expected variation when defining the machine requirement.
A 150 mm cube at 80 MPa produces an estimated 1800 kN load. The same cube at 100 MPa produces 2250 kN, so a 2000 kN frame would have insufficient nominal capacity for that example. Capacity selection also depends on the verified measuring range, specimen fit and the governing procedure.
Example concrete cube failure loads
| Cube | Expected strength | Estimated load | Initial review |
|---|---|---|---|
| 100 mm | 80 MPa | 800 kN | Review the verified low and high force range |
| 150 mm | 60 MPa | 1350 kN | Candidate for a suitable 2000 kN configuration |
| 150 mm | 80 MPa | 1800 kN | Review headroom and strength variation |
| 150 mm | 100 MPa | 2250 kN | Evaluate 3000 kN or another suitable capacity |
| 200 mm | 80 MPa | 3200 kN | Exceeds both 2000 and 3000 kN |
What automatic operation should cover
Automatic operation should be defined through the test sequence rather than by the word automatic alone. Confirm specimen approach, load-rate control, peak-load capture, result calculation, test termination, return behavior, data storage and report export for the proposed controller.
Ask for an operating demonstration using a representative specimen and a sample report. The review should show the configured method, specimen dimensions, live load response, recorded maximum load and the data retained for the laboratory's result workflow.
Check the concrete compression frame and fixtures
The concrete compression frame must accommodate the cube together with bearing faces, platens and spacers. Confirm vertical clearance, loading access, centering, piston travel and the supplied arrangement for every cube size in the laboratory schedule.
A machine configured for cubes may also support concrete cylinders when its force range, clearance, bearing blocks, spacers and end-preparation workflow cover the cylinder schedule. Specify cylinder diameter and height separately; automatic control does not remove the need for the correct physical configuration.
- List every cube size and loading orientation.
- Provide minimum, typical and maximum expected strengths.
- State the governing method and required edition.
- Request the fixture drawing, verification scope and sample report.
Compare the 2000 and 3000 kN automatic configurations
LS-CM2000A is the priority 2000 kN automatic concrete compression testing machine for laboratories evaluating quiet operation, stable loading, price and production lead time. LS-CM3000A and LS-CM3000P provide 3000 kN options for higher calculated loads and different automation requirements.
Choose from the complete specimen and method schedule. Maximum capacity, verified measuring range, frame clearance, controller behavior, supplied fixtures and verification documents should appear together in the final technical offer.
Frequently Asked Questions
Is a 2000 kN automatic machine suitable for 150 mm cubes?
It depends on expected strength. A 150 mm cube at 80 MPa produces an estimated 1800 kN load, while at 100 MPa it produces 2250 kN. Review strength variation, operating headroom, verified range and fixture suitability before selecting the machine.
Can an automatic concrete cube testing machine test cylinders?
It can when the machine's force range, clearance, bearing arrangement, spacers and end-preparation workflow suit the cylinder dimensions and governing method. Confirm both specimen schedules in the quotation.