New Device for Investigation Compactness-rate and Dynamic Modulus of Earthwork
Our partner, an European R+D SME has developed 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. This means that this 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 our 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!
Area of Application: –the whole area of 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 the University. 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.
Keywords: civil engineering, construction, control
Advantages: Main advantages 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. 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).
Environmental aspects: Cleaner Production , Energy efficiency , Systems integration
Development Status: Commercial Prototype
Legal Protection: Patent
Technical specifications: 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 nucl
Transfer Terms: Technology Licensing
Target Countries: World Wide
Contact Person: Laser Consult Ltd (Hungary)
Address: H-6701 PO Box 1191.