2013 Session: 651

• Analysis of Five-Point Bending Test for Multilayer Surfacing System on Orthotropic Steel Bridges
  Abstract: Light weight orthotropic steel deck bridges have been widely utilized in long span bridges, movable bridges and bridges in seismic zones. In the Netherlands a surfacing structure for orthotropic steel bridge decks mostly consists of five structural layers: top porous asphalt layer, guss asphalt layer, steel deck and two membrane layers.The French five-point bending test (5PBT) provides a laboratory scale test that allows studying the fatigue resistance of surfacing systems on orthotropic bridge decks (OBD). In this paper, an analytical solution for 5PBT setup is presented. In order to better understand the influence of geometrical, mechanical and structural parameters on the performance of the whole surfacing structure, a parametric study is performed at the numerical platform CAPA-3D that developed at the Section of Structural Mechanics of TU Delft. The thicknesses of the top porous asphalt layer, middle guss asphalt layer and the steel plate are varied. The Influences of the mechanical properties of both membrane layers are investigated. The sensibilities of those factors are evaluated by the examination of the maximum tensile stress at porous asphalt layers and the strain distributions at three cross sections.
  Authors: Li, Jinlong
  Authors: Li, Jinlong
  Year: 2013
  Document Type: Paper
  Subject: Bridges and Other Structures; Materials
  Session: 651
  Paper Number: 13-0815
• Design, Construction, and Performance of Mastic Asphalt Concrete for Orthotropic Bridge Decks
  Abstract: Mastic asphalt concrete is traditionally applied to the steel deck pavement for an orthotropic bridge. Since mastic asphalt concrete is poured into place and required no compaction, it is essential to develop the material especially for paving applications. The purpose of this research project is to characterize the engineering properties of mastic asphalt concrete and analyze the immediate and long-range performance of the paving system. Test results in the laboratory indicated that an increase in the Trinidad Lake Asphalt (TLA) content led to an increase in the softening point of mastic asphalt concrete. Morphology obtained from scanning electron microscopy showed that asphalt, TLA and mineral fillers were uniformly mixed. The properties and relative proportions of binders and mineral fillers significantly affected the engineering behavior of mastic asphalt concrete. The surface characteristics of aggregate were shown to play a key role in rutting resistance. Testing procedures were developed to design a mastic asphalt mixture for field construction. Practical experiences on the production and construction practices of mastic asphalt concrete were provided. The performance of mastic asphalt concrete was evaluated.
  Authors: Chen, Jian-Shiuh; Chen, Shih-Fan; Liao, Min-Chih
  Authors: Chen, Jian-Shiuh; Chen, Shih-Fan; Liao, Min-Chih
  Year: 2013
  Document Type: Paper
  Subject: Bridges and Other Structures; Materials
  Session: 651
  Paper Number: 13-0404
  Practice-Ready: Yes
• Experimental Evaluation of Shear Resistance of Improved Steel-Asphalt Interfaces
  Abstract: Although steel orthotropic deck is currently the most widely adopted solution for long-span bridges, the poor adhesion to the upper asphalt layers still represents a serious problem with a not clear solution. In recent decades many techniques, which involve the use of special bituminous bonding coats, reinforced asphalt membranes, net-reinforced steel deck surfaces or epoxy asphalt binders, have been applied, with varying results, to improve the level of adhesion of the asphalt pavement to the steel surface. In this experimental study two of such techniques were adopted in order to investigate the shear resistance of steel-asphalt pavement systems. The first technique uses epoxy asphalt both as a bonding coat and as a binder of the upper asphalt layer while the second technique concerns the use of a reinforced asphalt membrane that is applied on the steel deck before overlaying with conventional HMA.The ASTRA shear test device was used in order to evaluate the shear resistance of different types of HMA-steel interfaces and to investigate the effects of temperature and normal stress. The results have been compared with the shear properties of bitumen-coated interfaces, studied in a previous research. The results showed that epoxy asphalt guarantees high performance regardless of the test temperature. On the other hand, the shear resistance of the system with the asphalt membrane is lower than with the epoxy asphalt, although it is higher than the resistance of bitumen-coated interfaces at high temperatures.
  Authors: Bocci, Edoardo; Canestrari, Francesco
  Authors: Bocci, Edoardo; Canestrari, Francesco
  Year: 2013
  Document Type: Paper
  Subject: Bridges and Other Structures; Materials
  Session: 651
  Paper Number: 13-1938
  Practice-Ready: Yes
• Analysis of Five-Point Bending Test for Multilayer Surfacing System on Orthotropic Steel Bridges
  Authors: Li, Jinlong
  Authors: Li, Jinlong
  Year: 2013
  Document Type: Presentation; Poster
  Subject: Bridges and Other Structures; Materials
  Session: 651
  Paper Number: 13-0815