Compaction Uniformity to specification An Intelligent Compaction (IC) roller can test the entire range of the project, and its sensors can penetrate deeper into the fill. nuclear-density gauge, can only measure a limited amount of space at a time covering only a small percentage of the project s footprint. s / v > 3.5 If it is in-situ soil, it can be compressed further.ġ4 Integrated compaction control system Handheld testing devices, e.g. In case of compacted soil is valid: s / v 3.5 If compacted, the soil is unsuitable for further compaction! Soil improvement or a soil exchange is necessary. The value of s / v = 3.5 is relevant here. The degree of compaction is based solely on experience and provide the examiner with an immediate statement about the likely effectiveness of compaction, enabling you to take a decision about soil improvement or soil replacement. And the second integration gives the deflection. The first integration of acceleration shows the velocity of the plate. The measured result is available after only 4 steps.ġ3 Degree of Compaction The ZFG 3000 has an acceleration sensor attached to the base plate.
2 minutes), precise repeatable measurements, on-site printouts complete with all information and simple data transmission to the PC with SD-Card. From this acceleration signal will be calculated the dynamic deformation modulus Evd kg loading device (Evd 5-70 MN/m²) - 15kg loading device ( MN/m²) The easy-to-operate ZFG 3000 GPS enables the user to enjoy short test times (approx. On the load plate, an acceleration sensor is arranged. To calculate Evd, the deformability of the soil under a vertical load, as described above, with a settlement amplitude s (in mm) and the duration of impact t s : Evd (MN/m 2 ) = 1.5 x r x σ /s For the 10kg drop weight and 300mm diameter plate Evd = 22.5/s For the 15kg drop weight and 300mm diameter plate Evd = 33.75/s 6ħ How does it work A weight of 10 kg drops from a height of 72 cm on a load plate with a diameter of 300 mm. When the device is calibrated, the force is selected such that the maximum normal stress σ under the load plate is 0.1MN/m 2. This dynamic load plate test simulates and these conditions.Ħ Principles of Operation The soil receives an impact of maximum force Fs transmitted through the fall of the drop weight onto a circular plate of radius r, which is assumed to be rigid. Soil pressure of 10 tons / m² = 0.1 MN / m² along a time of 18ms Sizes of the test device: Diameter of the loading plate 300mm Force of load device 7.07kN Soil pressure under the load plate 0.1 MN/m² during a load time of about 18 ms The measuring time of 18 ms is created with the plate springs.
4ĥ What does it simulate? The Light Weight Deflectometer is developed from the idea that a truck with 10 tons axle weight moves at 80 km per hour on the road. What are the influences on the results? How do you calibrate the equipment? Technical standards How is the device used? Advantages and limitations 2Ĥ What does it do? The Light Weight Deflectometer can be used for: measuring the bearing capacity (deflection) degree of compaction insitu and laboratory dynamic CBR of subgrade/subsoils, unbound base layers, granular layers, backfilling materials, soil stabilisation with lime, cold recycling materials and pavements, cycle tracks and footpaths. How is it part of an integrated compaction control system Relationship with other devices What is the CBR Extension? What is the relationship between the Dynamic Modulus and CBR? What results do you get? Explanation of results graphs. 1 Light Weight Deflectometer Measuring Dynamic Modulus and CBR on-site Immediately Dynamic Plate Load Test Ģ Overview What is the Light Weight Deflectometer What does it do? Where did the Light Weight Deflectometer come from? What does it simulate? What results do you get? Explanation of results graphs.