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- Dahlin, Torleif, et al.
(författare)
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ASSERT - Kontroll av markstabilisering med resistivitetstomografi (ERT)
- 2023
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Ingår i: ; , s. 219-228
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Konferensbidrag (refereegranskat)abstract
- Soil stabilisation is becoming increasingly common for the development of areas withpoor bearing capacity. However, there is a need for better and volume-wide controlmethods for quality assurance. The control methods can be divided into two steps,where the first takes place in immediate connection to the mixing of binders to checkwhether the entire intended volume has been successfully treated, or whether thereare zones that need completion. The second step focuses on the strength of thestabilised volume and assumes that the binder has cured.The R&D project ASSERT focuses on quality control using electrical resistivitytomography (ERT). The idea is to use the method in immediate connection with themixing of binders to delineate the soil volume that has been treated with binders fromuntreated parts. ERT could then be used to quickly check the results of thestabilisation, so that supplementary measures can be taken in zones of insufficienttreatment while personnel and equipment are in place. Furthermore, there is potentialfor volume-wide quantification of strength growth via correlation between change inresistivity and change in strength during the curing process, but this would probablyneed to be done on a site specific basis.Testing and verification of the method takes place in different geomaterials in thelaboratory and in the field, including full-scale tests for different types ofstabilisations. Furthermore, method development and adaptation for the applicationare included, so that the method becomes sufficiently robust and fast to be usedroutinely in a sustainable manner. Field trials have been carried out by installingelectrodes in lime-cement columns and jet columns in direct connection to thestabilisation. Laboratory tests have so far been carried out for lime-cementstabilisation of clay and for stabilisation of dredged masses.
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