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The seismic protection of existing buildings is still a matter of great concern. In most historic towns of the Mediterranean area, where the seismic hazard is high, buildings are hundreds of years old. In these cases, although passive structural systems installed underneath the buildings can be an option, installation procedures are expensive and not always feasible. The idea of using ground improvement techniques to modify ground properties in the vicinity of the building in order to mitigate seismic shaking is therefore appealing. In this work the problem has been investigated through two centrifuge tests, to check the possibility of using novel grouts to create continuous soft isolating barriers,. The tests have been carried out at the Schofield Centre in Cambridge (UK). In the first test a horizontal continuous soft layer has been used, while in the second one a more realistic V- shape configuration was created in the ground. The model ground layer was prepared as a 30 cm dry sand, while the soft layer was made by using latex balloons filled with a water Super Absorbing Polymer (hydrogel).

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