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New Device for Investigation Compactness-rate and Dynamic Modulus of Earthwork    

A new device that measure two very different parameter.


A new device for Investigation dynamic compactness-rate and dynamic modulus of earthwork (B&C), which can measure two very different parameters, like the compaction-rate (Dpr%) and the dynamic bearing modulus (Ed) all over the world. The device includes two equipment characteristics instead of one. Dynamic compactness is a world-wide new theory, calculated not from density ratio, but from the settlement curve of drops.

Background information
The main theory is measuring the compactness-rate of soil and granular materials with a new developed “modified” (small-plate) dynamic light-falling weight deflectometer from the deflections, detecting the settlement curve on site. The widespread nuclear (isotope) density test measurement method is not applicable in limy stabilizations, in case of slag, or fly ash materials. As a summary we can say that the general methods are not environment friendly nor SME-friendly, therefore the above mentioned well-known problems can be avoided by this solution.

Innovation of the technology
The above mentioned bearing modulus can be measured by the LFW loading system which is 30 years old, and can be only used for measuring the bearing modulus, not the compactness rate.

The novelty of the device is that it can determine the compactness rate from the deflection curve (10-18 settlements). This is a new scientific method for determining the compactness-rate, not from the densities but from the settlement under the plate. This test needs p=0,35 MPa stress and 10-18 drops, while we can measure the dynamic modulus from only six drops.

This dynamic modulus is different from the earlier big-plate (German) LFWD, because the under-plate pressure is much higher. As a result the measured Ed dynamic modulus in the B&C system is equal with the Ev2 static modulus!

Primary Application of the Technology

Potential areas of use

–Civil engineering earthworks.
In civil engineering (road, railway, bridges, waterways, buildings, industrial halls) during grounding there are two main parameters which are important while Self-checking, in QC and under the QI.

The B&C device can be used by the control laboratory, by the Constructor SMEs for self-control, by the Controllers, and for research activities at Universities.

The device can be used for several other measurements, like the OSP (On Site Proctor), based on EN 13286-2 or AASHTO T-180 to determine Standard-Proctor (simplified) or modified Proctor densities on site. With the option of D=300 plate other standard tests (TP BFStB Part8.3, ASTM E2835-11) can be also done by using the B&C device and measuring software, not only the CWA15846.

The Problem Solved by the Technology

There are several types of this device which cover different market needs. One of these types is simplified (B&C2), offered to the Constructor for self-checking their earthworks (in ISO 9001 quality assurance).

The advantages of B&C can be demonstrated by comparing it to generally used measurement devices:

In comparison with density-rate compactness measurements, the advantages are:

• no need for nuclear source
• no need for dosimeter
• no need for transport or storage permit
• no destruction costs

The testing time in case of B&C is a minute/pc, much shorter, then any other measurement (which takes 30 minutes/ pc), like the sand-cone or water-balloon test or the old tube-test (density-ratio measurements). In comparison with other bearing capacity devices, the advantages are:

- No need for a formula to calculate the E modulus from the measured value, because the Ed (MPa) measured by B&C is equal with the static EV2 MPa.
- The measuring time (to get this two main results) is only one minute with our device, while a static test needs 30 minutes.

How the Technology Solves the Problem

B&C is a portable “easy to use” device and an “easy to learn” test because the measurement process is much easier due to its design, and as a result of the formula the calculations are much faster and more accurate. While the accuracy of nuclear density test can reach +/-5Cr%, the dynamic B&C is only +/-1Cr%. The record is 136 measurement results in a day (136 Cr% and 136 Ed tests).

One sand cone test needs 30 minutes – while during this time 30 pc B&C tests can be carried out. The B&C is as accurate than the sand-cone test and every B&C result is calculated with average Therefore B&C’s results have lower deviation than any other device.

Lots of other parameters can be calculated (based on regression analysis) for example the dynamic bedding coefficient c (N/mm3), CBR%, E2V static bearing modulus, Evib (CCC method - placed on roller), Evd big-plate LFWD modulus near high regression rate.

Competitive Advantage

This is an extraordinary device because it uses such novel methods that enable the measurement of two very different parameters, like the Compaction rate (Dpr%) and the dynamic bearing modulus (Ed). Until now these parameters used to be measured by two different devices all over the world.

Patent Summary

U.S. Patent Classes & Classifications Covered in this listing:

Class 73: Measuring And Testing

Processes and apparatus for making a measurement of any kind or for making a test of any kind, and takes all such subject matter not provided for in other classes. The term "test" includes inspection, processes and apparatus for determining qualities by inspection being included where not provided for in other classes. This class is the generic class for sampling and takes all sampling apparatus and processes not otherwise provided.

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