SE
Authored
18 records found
Effect of stone-on-stone contact on porous asphalt mixes
Micromechanical analysis
Within the pavement engineering community, porous asphalt (PA) mixes are regarded as mixes capable of reducing noise and improving wet skid resistance. However, these mixes are likely to have the distress of ravelling. In order to analyse the propensity of a given PA mix for rave
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The role of thermodynamics and kinetics in rubber–bitumen systems
A theoretical overview
Waste tire rubber has been incorporated into asphalt modification for decades due to its various benefits. There are two main mechanisms during bitumen–rubber interaction: rubber swelling and chemical degradation. This study surveys these two processes from the viewpoint of polym
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A state-of-the-art review of Natural bitumen in pavement
Underlining challenges and the way forward
The demand for alternative bitumen which could fully/partially replace Petroleum sourced bitumen for pavement construction is globally increasing. The increase in demand can be associated with several factors: depletion in crude oil resources, advances in crude oil refining proce
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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 pro
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On the need for innovation in road engineering
A Dutch example
In an ever faster changing world, innovation is a crucial tool to maintain the quality of road networks. In order to safely use innovative materials and techniques, validation procedures are needed. Because of the variable and non-standard nature of innovations, it is hard to sta
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Continuum-based micromechanical models for asphalt materials
Current practices & beyond
The mechanical properties of asphalt mixture are always required for the evaluation of the durability of pavements. In order to obtain these properties without conducting expensive laboratory tests and using calibrated empirical models, research studies have been carried out to d
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Aging of Bitumen and Asphalt Concrete
Comparing State of the Practice and Ongoing Developments in the United States and Europe
Aging is a crucial factor in pavement performance and being able to determine its effect on a mixture is necessary to link its initial properties to the properties over time in order to ensure the intended service life. This is becoming more important now that climate change lead
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Exploring the impact of humidity and water on bituminous binder aging
A multivariate analysis approach (TI CAB)
Bituminous binders naturally age, affecting the properties and performance of asphalt pavements. The physical and chemical characteristics of binders are influenced by environmental factors, leading to a decline in their performance and durability. Therefore, it is essential to u
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PDB2DAT
Automating LAMMPS data file generation from PDB molecular systems using Python, Rdkit, and Pysimm
Pdb2dat, developed in Python, is an open-source, self-contained utility that facilitates the conversion of PDB files into LAMMPS data files, catering to the need of initializing atomistic simulation from initial atomic configurations. It extracts molecular details from PDB files,
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SMI2PDB
A self-contained Python tool to generate atomistic systems of organic molecules using their SMILES notations
The advent of computational techniques, particularly atomistic simulations, has lessened the dependency on physical experiments in various scientific fields. Yet, the preparation complexity for simulations using platforms like LAMMPS and GROMACS persists. We introduce SMI2PDB, a
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NL – LAB
Eerste resultaten op basis van typeonderzoek (RAW proef 62) en bindmiddel onderzoek voor asfaltbeton
Het nieuwe onderzoeksproject NederLands Langjarig Asfalt Bemonsteringsprogramma (NLLAB) heeft als doel de materiaaleigenschappen tussen een gerealiseerd werk in de praktijk te vergelijken met de eigenschappen zoals gevonden voor een laboratorium gemengd en verdichte mengsels via
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Het effect van wrijvingsreductie methoden in de Triaxiale Cyclische Drukproef op Asfalt (weerstand tegen permanente vervorming)
EN 12697-25:2005 versus EN 12697-25:2016, Method B: triaxial Cyclic Compression
In dit rapport wordt een onderzoek beschreven met vijf verschillende wrijvingsreductiesystemen. De aanleiding was een verandering in de EN 12697-25, waarbij Latex wrijvingsreductie vervangen is door Teflon, terwijl er flink wat onderzoek is dat liet zien dat Teflon voor asfalt mi
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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
beton. Hierbij wordt niet zo zeer op het “recept” van het asfalt gestuurd, als
wel op de eigenschappen ervan die van belang zijn voor het gedrag in de weg.
Binnen het NL-LAB programma wordt de relatie tus
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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 funct
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Epoxy modified bitumen
Chemical hardening and its interpretation
Epoxy modified bitumen (EMB) is a promising technology for long lasting paving materials ensuring higher resistance to rutting, oxygen- and moisture-induced damage. In this paper, an analysis of the chemical reactions that take place during the chemical hardening process (curing)
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Epoxy modified bitumen
Chemical hardening and its interpretation
Epoxy modified bitumen (EMB) is a promising technology for long lasting paving materials ensuring higher resistance to rutting, oxygen- and moisture-induced damage. In this paper, an analysis of the chemical reactions that take place during the chemical hardening process (curing)
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Field Trials with Epoxy Asphalt for Surfacing Layers
Province of North Holland Case Study
The addition of epoxy modifier in bitumen is a relatively new modification technology (1-4) and the most critical epoxy polymerization-induced changes of the epoxy-bituminous materials are not fully understood. Different phenomena take place when epoxy modifiers are incorporated
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Infrastructure for Automated and Connected Driving
State of the Art and Future Research Directions
The integration of automated and connected vehicles on our existing road network is expected to impact traffic efficiency and safety. This upcoming new reality causes road operators, researchers, and policy makers to raise critical questions on the requirements and implications o
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Contributed
2 records found
Aging of Asphalt Symposium
Delft, the Netherlands September 17th 2014
Technical specifications for the asphalt concrete properties are developed to be able to specify mixtures that will perform well in pavement applications. Being able to identify and determine properties related to pavement performance in practice is crucial for both road authorit
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Crumb rubber modified bitumen
Experimental characterization and modelling
A sustainable pavement, which can minimize environmental impacts through the reduction of energy consumption, natural resources and associated emissions while meeting all performance conditions and standards, is in urgent need to combat the climate change. The current scenario of
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