Employing an advanced analysis method, Nynas researchers are starting to unmask the chemical structure of bitumen. Xiaohu Lu explains how TOF-SIMS is used to analyse the surface structure of bitumen.
Les mer om Revealing structureIt was found that PMBs, particularly SBS modified, demonstrate better rheological properties as compared to unmodified bitumens, even after several years in the field.
Les mer om Evaluation of Test Sections with Polymer Modified BitumensIncreases in traffic density and axle loading in combination with a pressure to reduce material costs has created high performance requirements for asphalt pavements.
Les mer om Durability of polymer modified binders in asphalt pavementsSome of the greatest sustainable developments in the mastic asphalt industry have occurred in Germany, and a new paper presented by the Nynas Competence Centre Antwerp has assessed these developments over the past 15 years.
Les mer om Reducing the temperatureA paper presented by the Nynas Competence Centre Antwerp examines how bitumen producers such as Nynas can contribute, through specific products and solutions, to the three pillars of sustainability: economic, ecological and social interests.
Les mer om Contributing to sustainabilityA new Multiple Stress Creep Recovery Test (MSCRT) has been introduced as a fast and user-friendly bitumen specification test for rutting. A Nynas study analysed whether this MSCRT relates to rutting and how the test can identify the presence of a polymer network in a bituminous binder.
Les mer om New test for rutting evaluatedAsphalt mixture fatigue tests are widely used but are time consuming and expensive. Alternatively, binder fatigue tests might be an effective preliminary evaluation of material for mixture fatigue life testing. An interlaboratory test was performed to investigate the repeatability as well as the reproducibility of binder fatigue tests.
Les mer om Bringing new life to fatigue testsAssessment of interlayer bonding is of primary importance but research is needed to better harmonise test methods. In this study, 14 laboratories from 11 countries participated in an interlaboratory test to compare the different test procedures for assessing the interlayer bonding properties of asphalt pavement.
Les mer om Reading between the layersThe application of Differential Scanning Calorimetry (DSC) has been proven useful in characterizing bituminous binders, distillates and crude oils. In this paper, results of the round robin test, organized by the Rilem TC 231 Nanotechnology-based Bituminous Materials (NBM) TG1 group are reported.
Les mer om Differential Scanning Calorimetry applied to bitumen: Results of the RILEM NBM TG1 Round Robin test.The Multiple Stress Creep Recovery Test (MSCR) was recently introduced to evaluate bituminous binders at high service temperatures, in particular to evaluate the stress or loading resistance
Les mer om The Multiple Stress Creep Recovery Test: A Detailed Analysis of Repeatability and ReproducibilityAs binder aging plays a significant role in the durability and performance of asphalt pavements, it is important to understand and quantify the effects of aging.
Les mer om Aging of Bituminous FilmsThis paper deals with the aging characteristics of SBS polymer modified binders in porous asphalt pavements. Field cores were taken from test roads of different ages and structurally analyzed using X-ray tomography. Binders were extracted from the upper and under layers of the field-aged cores and characterized using gel permeation chromatography, Fourier transform infrared spectroscopy, dynamic shear rheometer, as well as conventional penetration test. The chemical and mechanical characterization was also carried out on the binders recovered from loose mixes, and on the binders aged in laboratory by RTFOT and PAV.
Les mer om Aging Characteristics of Polymer Modified Binders in Porous Asphalt PavementsThis paper studies the influence of morphology and storage stability of polymer modified binders on the mechanical performance of asphalt mixes, in particular permanent deformation and fatigue characteristics. Four 70/100 pen bitumens of different crude origins and a linear SBS were selected to prepare polymer modified binders (PmBs). The binders showed differences in morphology, storage stability and in phase separation diagram; their rheological properties were found to be strongly morphology-related.
Les mer om SBS Modified Bitumens: Does Their Morphology and Storage Stability Influence Asphalt Mix Performance?Various polymer modified bitumens (PmBs) were prepared and characterized using a dynamic shear rheometer and a bending beam rheometer. PmBs differ considerably in viscoelastic properties depending on base bitumen, and polymer type and content. The rheology of PmBs is strongly related to the morphology, and is also affected by sample preparation.
Les mer om Rheological Characterization of Polymer Modified BitumensWaxes isolated from different bitumens were investigated with respect to their chemical compositions and structural characteristics. Isolation of waxes was performed using a distillation method (European standard EN 12606-1) and a method based on size exclusion chromatography.
Les mer om Compositional and Structural Characterization of Waxes Isolated from BitumensThis paper mainly deals with waxes which are naturally present in bitumens, and does not include synthetic waxes that sometimes are proposed as bitumen additives. The main objectives were to study the rheological effect of bitumen waxes and the impact of waxy bitumens on asphalt mixture performance, such as rutting, low temperature cracking, and water sensitivity.
Les mer om Effect of Bitumen Wax on Asphalt Mixture PerformanceA new method for determining wax content in petroleum materials is developed. It is based on thin layer chromatography with flame ionization detection (TLC-FID) and involves two-step development with two solvents.
Les mer om A New Test Method for Determination of Wax Content in Crude Oils, Residues and BitumensIn hot mix asphalt, binder extraction in combination with a recovery method is commonly used to evaluate the properties of a binder embedded in an existing pavement structure. In some countries, like Germany, specifications on the softening point and elastic recovery are legally required on polymer modified binders (PmBs), after recovery from a pavement.
Les mer om Evaluation of binder recovery methods and the influence on the properties of polymer modified bitumenA comprehensive literature study on road durability has indicated that the aging susceptibility of bituminous binders in surface layer is a key parameter determining the life time of an asphalt pavement.
Les mer om Ageing of bituminous binders - laboratory tests and field dataBitumen containing natural waxes and their effect on asphalt performance has been debated for many years. The objective of this paper is to develop a simple method for determining waxes in bitumens and in crude oils.
Les mer om A simple test method for determination of waxes in crude oils and bitumensThere is considerable interest in the possibilities of producing and paving asphalt at reduced temperature. A reduction of the temperature generates a significant reduction in energy consumption, emissions and fumes. Also health and safety conditions for the road workers are improved.
Les mer om A laboratory study on the use of waxes to reduce paving temperaturesEffect of ageing on bitumen chemistry and rheology was studied. Seven bitumens were aged according to the thin film oven test (TFOT) and the rolling thin film oven test (RTFOT). The binders were characterised using infrared spectroscopy, chromatography and dynamic mechanical analysis.
Les mer om Effect of Ageing on Bitumen Chemistry and Rheology