THE USE OF BITUMINOUS MIX SUB-BALLAST IN THE ITALIAN STATE RAILWAYS

摘要: It can be estimated that Ferrovie dello Stato trains currently use around 370 km of railway line with bituminous mix sub-ballast, i.e. involving at least 600,000 cubic metres the product. The project standards for new High-Speed lines require a 12cm layer sub-ballast. Thus, approximately 1,700,000 will needed and changes or renovations planned. studies testing in progress are considered important two main reasons: achievement established objectives ensure benefits both from an environmental point view (lower impact infrastructures on environment) regards to vibration sensitive individuals/receivers. Furthermore, it possible outline standardize building methods which improve performance entire structure. Although results so far have mainly been achieved through laboratory testing, following points confirmed: (1) traditional abates vibrations rail traffic; (2) modified rubber granule additives absorbs more energy; (3) mathematical model outlined confirms results. planned on-site monitoring test provide further confirmation amount energy absorbed by sub-ballast when compared sections without implemented verification activities is planning together University Rome - La Sapienza API. For covering abstract see ITRD E107185.