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PRIMA 100 LWD
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16/09/2008 |
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The easy way to quality assurance
Using a portable falling weight deflectometer, PRIMA 100, is the fastest, easiest and most secure way to bearing capacity determination and quality assurance of unbound layers. PRIMA 100 measures the surface modulus and presents results immediately to allow in-situ decisions.
PRIMA 100 applications
Road construction:
 Control of road base structures such as (sub)base, base course gravel, recycled concrete, recycled asphalt, slag and crushed aggregate. Isotope measuring and Protor cannot be applied for recycled concrete and crushed aggregate. For this purpose PRIMA 100 is well suited, as static load bearing testing is far more expensive.
Ramps, parking spaces, terminals, etc.: Control of base structures for ramps, approach areas near industrial buildings, freight terminals, stocks, parking spaces, harbour terminals, etc.
Industrial flooring:
Control of base structures before concrete or asphalt paving in industrial buildings, stocks, etc.
In the three above cases the employer’s consultant controls the E modulus values, as the E moduli form the basis of the projecting.
Excavations:
In connection with excavations and re-establishment of road areas etc. the E moduli are determined during the excavation work and when re-establishing, compaction should reach the same modulus value. In this way differential settlements are avoided.
Sand cushions, foundation ditches:Control of compacted sand cushions for single-family houses etc. Control of foundation ditches.
In this case should be measured E moduli of > 30 MN/m2 (MPa) in all points and an average of >= 45 MN/m2 for the entire sand cushion. In foundation ditches E moduli of > 10 MN/m2 should be measured and an average of >= 15 MN/m2 in the entire ditch (the values correspond to requirements for similar vane strengths).
Construction of interim roads for e.g. construction work and timber transports:
In connection with construction of interim roads for heavy loads, the bearing capacity is controlled during construction as the demands regarding bearing capacity can be rather heavy in these cases.
Construction with geogrids: In connection with structures with geogrids for reinforcement of the sublayer the measurements will show, whether the geogrid has the expected effect.
Please note: In most cases measuring of E moduli is more relevant than measuring compaction degrees. This means that it is more relevant to use a falling weight deflectometer than to perform isotope measurements or use Proctor. However, it has not been possible to use a portable equipment for measurement of E moduli before PRIMA 100.
PRIMA 100 is faster than isotope and Proctor. Isotope and PRIMA 100 measurements are done equally rapidly, whereas Proctor results will not be ready before the day after the measurements were performed.
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