Kvalitest

Construction testing

Structural Testing

Measurement of deformation properties of soil layers, aggregates, stabilized soils, geosynthetically reinforced layers, and other structural layers.

Static plate load test: a hydraulic jack presses steel plates of 150 to 762 mm diameter into the ground against an excavator, and the larger the plate, the deeper the measurement reaches COUNTERWEIGHT Ø 150 mm Ø 300 mm Ø 357 mm Ø 505 mm Ø 600 mm Ø 762 mm Ø mm 150 150 300 300 357 357 505 505 600 600 762 762

Static Load Test

The static load test with a plate according to STN 73 6190:2019 is used to measure the deformation properties of soil layers, aggregates, stabilized soils, geosynthetically reinforced layers, and other structural layers built using compaction and layering technologies.

The measurement principle involves gradually loading the surface of the tested layer using a rigid circular plate, a hydraulic cylinder, and a counterweight, which is created using a construction machine or a vehicle with sufficient weight.

Steel plates of various diameters are used for the test, with different depth ranges of measurement. Our company utilizes plates with diameters of 150 mm, 300 mm, 357 mm, 505 mm, 600 mm, and 762 mm, depending on the purpose of the test and the available counterweight.

Static load test with a roller as the counterweight Static load test of a subgrade layer with a loader as the counterweight
Fig. 1-2 Static load test of soil structure and subgrade layer

Dynamic Load Test

The dynamic load test using a light dynamic plate (also known as an impact load test) according to STN 73 6192:2011 is used to measure the deformation properties of soil layers, aggregates, stabilized soils, geosynthetically reinforced layers, and other structural layers built using compaction and layering technologies.

Unlike the static load test mentioned above, this test uses a standardized circular plate with a diameter of 300 mm, and the loading is performed by a quick impact from the moving weight of the testing device. The plate diameter and the applied contact pressure limit the measurement depth to a maximum of 500 mm.

Light dynamic plate test: a weight falls three times on the plate, the device records the settlement of each drop over time and works out the dynamic modulus ≤ 500 mm Ø 300 mm 10 kg LDD Ø 300 mm · 10 kg s [mm] t [ms] s10.452 s20.438 s30.431 Evd 50.7 MPa
Principle of the dynamic load test: the weight falls on the plate three times and the device records the settlement of each drop
Dynamic load test in a construction pit Dynamic load test of a soil subgrade
Fig. 3-4 Dynamic load test of soil structures

Supplementary Geotechnical Tests

Supplementary geotechnical tests to determine the physical and mechanical properties of soils, aggregates, and the deformation properties of soil structures, performed during quality control, geotechnical surveys, and diagnostics:

  • Measurement of deformation parameters using the Humboldt H-4140 geo-probe (Fig. 5)
  • Measurement of compaction degree, bulk density, and soil moisture using the Humboldt H-4114C electric compaction meter (Fig. 10)
  • Measurement of soil bulk density using a cutting cylinder (Fig. 5, 6)
  • Measurement of soil bulk density using a sand volumeter (Fig. 9)
  • Direct measurement of soil moisture by drying in a hot-air oven
  • Measurement of soil moisture using an electronic moisture meter (Fig. 7)
  • Measurement of soil physical-mechanical parameters using a vane shear test
  • Measurement of soil penetration resistance using a light dynamic penetrometer (Fig. 8)
  • Measurement of soil penetration resistance with derivation of soil physical-mechanical parameters using a light static penetrometer and Proctor needle (Fig. 11)
  • Non-destructive concrete strength measurement using a Schmidt hammer (Fig. 12)
Humboldt H-4140 geo-probe and cutting cylinder test
Fig. 5
Soil bulk density measurement with a cutting cylinder
Fig. 6
Soil moisture measurement with an electronic moisture meter
Fig. 7
Light dynamic penetration test
Fig. 8
Soil bulk density measurement with a sand volumeter
Fig. 9
Humboldt H-4114C electric compaction meter
Fig. 10
Light static penetrometer and Proctor needle
Fig. 11
Concrete strength measurement with a Schmidt hammer
Fig. 12

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