A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Strengthening and rehabilitation of pavements applying thin layers of reinforced ultra-high-performance concrete (UHPC-white topping)
'White topping' means the improvement or the rehabilitation of fatigued bituminous or concrete road pavements by applying a new concrete layer using the existing structure as base course. This method is known since the 1920th when it was firstly performed in the USA. Up to now as a rule, ordinary concrete is used and the thickness so far is equivalent to those of newly paved structures depending e.g. on the intensity of the traffic and the load bearing capacity of the base. Only in a few cases even thinner overlays were applied. A new technology is white topping of heavily trafficed pavements with thin layers of only 60 mm to 80 mm consisting of continuously reinforced HPC (High-Performance concretes) or UHPC (Ultra-High- Performance concretes). The method is appropriate to strengthen the load bearing capacity of existing pavements preventively to enable it to withstand the increasing intensity of the traffic or to restore fatigued structures already showing structural damages. Due to the high quality of the concretes used the system is assumed to be very durable and long lasting. The technology is both economic and sustainable because of the facts that no material from the existing pavement has to be removed and to be replaced and only a minimum of material is needed for the overlay. The thin overlay can be applied within a short time so that the obstruction of traffic is minimized. A small test section has already been performed. In a comprehensive research project coordinated by the Federal Highway Research Institute (BAST), supported by the State of Nordrhein-Westfalen (NRW) and primarily performed by the University of Kassel the technical and economic aspects of the new technique are studied covering the development of adequate concretes as well as the design of the pavement structure and its long time load bearing behaviour under dynamic traffic loads. The economic efficiency will be compared to traditional rehabilitation measures considering the whole life-cycle.
Strengthening and rehabilitation of pavements applying thin layers of reinforced ultra-high-performance concrete (UHPC-white topping)
'White topping' means the improvement or the rehabilitation of fatigued bituminous or concrete road pavements by applying a new concrete layer using the existing structure as base course. This method is known since the 1920th when it was firstly performed in the USA. Up to now as a rule, ordinary concrete is used and the thickness so far is equivalent to those of newly paved structures depending e.g. on the intensity of the traffic and the load bearing capacity of the base. Only in a few cases even thinner overlays were applied. A new technology is white topping of heavily trafficed pavements with thin layers of only 60 mm to 80 mm consisting of continuously reinforced HPC (High-Performance concretes) or UHPC (Ultra-High- Performance concretes). The method is appropriate to strengthen the load bearing capacity of existing pavements preventively to enable it to withstand the increasing intensity of the traffic or to restore fatigued structures already showing structural damages. Due to the high quality of the concretes used the system is assumed to be very durable and long lasting. The technology is both economic and sustainable because of the facts that no material from the existing pavement has to be removed and to be replaced and only a minimum of material is needed for the overlay. The thin overlay can be applied within a short time so that the obstruction of traffic is minimized. A small test section has already been performed. In a comprehensive research project coordinated by the Federal Highway Research Institute (BAST), supported by the State of Nordrhein-Westfalen (NRW) and primarily performed by the University of Kassel the technical and economic aspects of the new technique are studied covering the development of adequate concretes as well as the design of the pavement structure and its long time load bearing behaviour under dynamic traffic loads. The economic efficiency will be compared to traditional rehabilitation measures considering the whole life-cycle.
Strengthening and rehabilitation of pavements applying thin layers of reinforced ultra-high-performance concrete (UHPC-white topping)
Verstärkung und Sanierung von Straßenbelägen durch Aufbringung dünner Schichten von verstärktem Ultrahochleistungsbeton (UHPC-white topping)
Schmidt, Cornelia (author) / Geisenhanslüke, Carsten (author) / Riedl, Steffen (author) / Schmidt, Michael (author)
2008
8 Seiten, 3 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
Straßenbau , Straßenbelag , Straßenbefestigung , Sanierung , Beton , Hochleistungsbeton , Ultrahochleistungsbeton , Griffigkeit , Druckfestigkeit , Lebensdauer , Dauerhaftigkeit , mechanisches Verhalten , stahlfaserverstärkter Beton , Schicht (Belag) , Oberflächenschicht , Verbundkonstruktion , Verbundbauweise
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