Obiettivo Objectives and content One of the most economic methods of constructing large span highway and railway bridges is by using post-tensioned concrete. This method of construction has now been widely in use for almost 45 years. During the last 10 years, it has become evident that durability problems due to inadequately grouted ducts may dramatically affect the expected long term performance of post-tensioned structures and may have been partially overlooked. In the case of inadequately grouted ducts, de-icing salts for instance, used to keep roads open to traffic during frost and snow, will start to corrode the particularly sensitive post-tensioning tendons. The electro-chemical attack is indeed concentrated at the voids of the ducts. Dramatic collapses in both the UK and Belgium, premature demolitions and unforeseen extensive maintenance works all over Europe created great concern. It is clear that, as embargoes on the design of post-tensioned bridges exist already in the UK and in Italy and are expected in other countries, there is an urgent need to come forward with improved and reliable grouting processes to make possible a further prosperous development of post-tensioning applications. Improvements on the current processes of grouting post-tensioning ducts require parallel developments in the field of grouting materials, grouting techniques and QA/QC systems. It, is therefore, the objective of this project to: - introduce suitable QA procedures (with newly developed equipment for overall and local sensing systems) which can be applied during and immediately after grouting, - develop grouts which show improved properties both in the fresh and hardened state (flowability, bleed, volume change,...) - develop improved grouting techniques and specifications. The results of this research program will not only be applied to the construction of post-tensioned bridges, but will also be applicable to the construction of other post-tensioned structures such as buildings, offshore rigs, nuclear reactors, aero generators, etc. Outputs of the research, i.e. the development of a new grout, QA and improved grouting techniques, will be directly exploitable. Campo scientifico engineering and technologyother engineering and technologiesnuclear engineering Programma(i) FP4-BRITE/EURAM 3 - Specific research and technological development programme in the field of industrial and materials technologies, 1994-1998 Argomento(i) 0203 - Reliability and quality of materials and products Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore GIFFORD AND PARTNERS LTD. Contributo UE Nessun dato Indirizzo Ringwood Road, Woodlands, Carlton House SO40 7HT SOUTHAMPTON Regno Unito Mostra sulla mappa Costo totale Nessun dato Partecipanti (7) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto BELGIAN BUILDING RESEARCH INSTITUTE (CSTC/WTCB) Belgio Contributo UE Nessun dato Indirizzo 21,Avenue P. Holoffe 21 1342 LIMELETTE Mostra sulla mappa Costo totale Nessun dato Cinec SA Belgio Contributo UE Nessun dato Indirizzo 299,Harensesteenweg 299 1800 Vilvoorde Mostra sulla mappa Costo totale Nessun dato DANSK BETON TEKNIK A/S Danimarca Contributo UE Nessun dato Indirizzo 21,Helleruplund Allee 21 2900 HELLERUP Mostra sulla mappa Costo totale Nessun dato Danish Road Directorate (State Agency) Danimarca Contributo UE Nessun dato Indirizzo 13,Niels Huels Gade 1020 København Mostra sulla mappa Costo totale Nessun dato Danmarks Tekniske Universitet Danimarca Contributo UE Nessun dato Indirizzo 2800 Lyngby Mostra sulla mappa Costo totale Nessun dato EEIG Identity Belgio Contributo UE Nessun dato Indirizzo 75,Ispralaan 2400 Mol Mostra sulla mappa Costo totale Nessun dato GLOETZL, GESELLSCHAFT FUER BAUMESSTECHNIK MBH Germania Contributo UE Nessun dato Indirizzo Forlenweg 11 76287 RHEINSTETTEN Mostra sulla mappa Costo totale Nessun dato