A parameter back-calculation technique for pavements under moving loads

Maintenance and rehabilitation strategies of pavements are usually made based on the results of performance evaluation. An efficient tool for pavement structural evaluation at network level is the traffic speed deflectometer (TSD) test. In order to deal with TSD measurements, this paper proposes a parameter back-calculation technique. Firstly,...

Parameter Identification of Asphalt Pavements Subjected to Moving Loads

Pavements generally demand necessary maintenance and rehabilitation to maintain their service performance in the whole lifespan. The maintenance and rehabilitation strategies are usually formulated based on the results of non-destructive testing, in which the traffic speed deflectometer (TSD) test is an efficient tool for pavement structural...

Study of Asphalt Binders Fatigue with a New Dynamic Shear Rheometer Geometry

With the effort to predict precisely the lifetime of asphalt binders and subsequently optimize their utilization in a more economical way, the objective of this study was to introduce a new methodology to improve the fatigue characterization of asphalt binders through a new dynamic shear rheometer (DSR) sample testing geometry. Initially,...

Chemo-rheological Study of Hardening of Epoxy Modified Bituminous Binders with the Finite Element Method

Induction hardening of thermoset modified bituminous materials

Induction assisted chemical hardening (curing) or induction hardening is a novel in situ hardening technique for thermoset modified bituminous materials that maintains most of the advantages of natural chemical hardening while eliminating the possible restrictions of longer curing times at lower temperatures. In particular, induction heating can...

Experimental and computational investigation of gas diffusion in bitumen

When oxygen diffuses in a bituminous film, it also reacts, simultaneously, with the constituents of the bitumen and as such it is gradually depleted. This depletion process masks the characteristics of the actual diffusion process and complicates the determination of the diffusion coefficient needed for computation of oxygen concentration and...

Microstructural Changes in Bitumen at the onset of Damage-healing

Self-healing of bitumen is a property that positively contributes to the sustainability, maintenance requirements and cost effectiveness of asphalt pavements. Ideally one would like to design an asphalt mix with a well-defined healing potential. Although substantial research efforts have been dedicated to the healing mechanism in bitumen,...

American and European Mix Design Approaches Combined: Use of NCHRP Performance Indicators to Analyze Comité Européen de Normalisation Test Results

This paper describes a project that is part of NL-LAB, a larger, long-term program at Delft University of Technology, Netherlands, which aims to establish the predictive capacity of the current European functional tests for Dutch asphalt concrete (AC) mixtures. In this NL-LAB program, the functional characteristics of resistance to rutting (EN...

Combining the American and European mix design approaches:: utilization of NCHRP performance indicators for analysis of CEN-test results

In the Netherlands, the functional approach described in the 2008 European Asphalt Concrete standards was selected, specifying mixtures by their stiffness, fatigue resistance, permanent deformation, moisture sensitivity and limited composition data. The requirements for the functional specifications were based on the existing experience with a...

Relatie tussen ITS, weerstand tegen vervorming en de mengsels samenstelling: Gebruik van de MEPDG relaties voor Nederlandse mengsels uit NL-LAB

Sinds 2008 werken we in Nederland met functionele eigenschappen voor asfalt<br/>beton. Hierbij wordt niet zo zeer op het “recept” van het asfalt gestuurd, als<br/>wel op de eigenschappen ervan die van belang zijn voor het gedrag in de weg.<br/>Binnen het NL-LAB programma wordt de relatie tussen deze functionele<br/>eigenschappen en het gedrag in...

Microstructural self-healing of bituminous materials: Combined experimental and numerical study

Bituminous materials form a class of materials that possess the intrinsic ability to selfheal. This self-healing capability is evidenced by the observation that the service life of these materials ‘in the field’ exceeds the service life as predicted by standard mechanical laboratory tests. This mismatch between laboratory prediction and field...

Microstructural self-healing of bituminous materials: Combined experimental and numerical study

Bituminous materials form a class of materials that possess the intrinsic ability to selfheal. This self-healing capability is evidenced by the observation that the service life of these materials ‘in the field’ exceeds the service life as predicted by standard mechanical laboratory tests. This mismatch between laboratory prediction and field...

Analysis of five-point bending test for multilayer surfacing system on orthotropic steel bridge

The French five-point bending test (5PBT) provides a laboratory scale test that allows studying the fatigue resistance of surfacing systems on orthotropic steel deck bridges (OSDB). The surfacing structure for OSDB in the Netherlands consists mostly of multilayer system: top porous asphalt layer, guss asphalt layer, steel deck and two membrane...

The development of a 3D-FEM for the Design of Bridge Surfacings

The life span of surfacings for orthotropic steel deck bridges is often limited.<br/>There is no universally accepted method for the design of surfacings. However,<br/>some theories to estimate the stresses/strains in the different layers are available.<br/>These theories are almost all based on one or both of the following assumptions:<br/>1....