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Testing higher compaction with double falling weight

Medium-sized drop weight “TERRATEST MFG 2.0” was developed specifically for the use on base courses with high compaction rates. The Light Falling Weight Deflectometer with an impact force of 7.07 kN achieves settlements on base courses with a bearing capacity EV2 higher than 120 MN/m2 that are too low to allow for a precise analysis of the test results. It is thus approved for a measuring value up to 70 MN/ mEvd or 120 MN/m2 EV2 only. In cases of higher compaction rates over 120 MN/m2 EV2 no reliable correlation with the static load plate test was possible up to now. 

With the use of the medium-sized drop weight with double falling weight you can do this now. With a double impact load of 14,140 N, the medium-sized drop weight is especially suitable for testing the compaction quality according to ZTV SoB-StB, like frost protection layers, rubber and gravel base courses as well as top layers without binders. The medium-sized drop weight can also be used on other layers with high compaction rates, like ground improvements with lime or cement. The increased impact force of 14,140 N is being achieved by using a 15 kg drop weight in connection with stronger disc springs according to DIN 2093-B 63. The maximum normal stress under the load plate thus changes from 0.1 MN/m2 for the Light Weight Deflectometer to 0.2 MN/m2 for the medium-sized drop weight. The dynamic load plate test with the medium-sized drop weight with 2.0-fold impact load corresponds to the German Technical Test Code for Aggregates in Road Constructions TP Gestein-StB Part 8.2.1. 

The medium-sized drop weight TERRATEST MFG 2.0 with double falling weight is approved for a measuring range more than 120 MN/m2. This means, that customer needs a combi device LFG 1.0 and MFG 2.0 to perform compaction tests over the whole range from natural soil to high compacted base courses. In only one minute, the LWD can easily be changed into the medium-sized drop weight MFG 2.0 by quickly exchanging only the loading device directly on the construction site.

MFG 2.0 with double falling weight

Soil improvement (cement or chalk)

High compacted base courses made of crushed rock

Frost protection courses