fischer FIS EM fixes noise barrier
A joint study by the University of Padua and fischer Italy about the fatigue performance of threaded rods fixed in concrete with fischer epoxy resin FIS EM shows positive results.
Fixings for noise barriers along high-speed railway tracks are subject to special requirements. A study ommissioned by the Italian railway engineering company Italferr on the dimensioning and load-bearing behaviour of noise barriers resulted in some dramatic changes to the previous design methods. Fatigue tests are now the key criteria for testing components such as anchorings, profile sections and panels.
The appropriate standards and norms are currently being updated or developed further. This also applies to the definition of the test structure and the test protocols, both for Italian (UNIFER, UNI, GL 31 group) and international regulations (CEN, TC 226, WG 6). For scientific support for the engineering task, fischer Italy has cooperated with University of Padua’s Prof. Paolo Lazzarin, an expert in the field of material fatigue. In the course of the cooperation, an extensive series of tests was carried out at the Denzlingen laboratories on the fatigue behaviour of threaded rods with different diameters set in concrete with the FIS EM injection mortar. The tension
and bending tests were made in accordance with fischer’s Technical Handbook. The investigations showed clearly that the weakest part of the system is the steel threaded rod in the region just below the nut where the tension forces concentrate. The results were very satisfactory as far as the behaviour of the epoxy resin was concerned: no failures were found, either in the resin mortar or in the concrete. On the strength of these results, fischer Italy was approved by the Italian railway company to fix threaded rods in an important noise barrier project with FIS EM.
Marzia Viel, Marketing, fischer Italy