Author
Xiaohu Lu
Other affiliations: Royal Institute of Technology
Bio: Xiaohu Lu is an academic researcher from Nynas. The author has contributed to research in topics: Asphalt & Dynamic shear rheometer. The author has an hindex of 29, co-authored 76 publications receiving 3291 citations. Previous affiliations of Xiaohu Lu include Royal Institute of Technology.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the effect of ageing on bitumen chemistry and rheology was studied, where seven bitumens were aged according to the thin film oven test and the rolling thin-film oven test (RTFOT) and the binders were characterised using infrared spectroscopy, chromatography and dynamic mechanical analysis.
549 citations
TL;DR: In this paper, the state of the art in test methods for polymer modified bitumens is presented, and a general description of each non-standardized test procedure is given.
Abstract: Polymer of road applications and their effects of functional properties (permanent deformation, fatigue cracking, low temperature cracking, stripping, wear resistance and ageing) of asphalt pavements are described. The state of the art in test methods for polymer modified bitumens is presented. The methods are classified as standardized or non-standardized. A general description of each non-standardized test procedure is given. Current or proposed specification models for polymer modified bitumens are summarized. The present situation regarding test methods and specifications of polymer modified bitumens and the need for further development are discussed.
304 citations
TL;DR: In this paper, the ageing properties of SBS polymer modified bitumens were evaluated using Dynamic Mechanical Analysis (DMA), Gel Permeation Chromatography (GPC), and Fourier Transform InfraRed (FTIR) spectroscopy.
277 citations
TL;DR: In this paper, the morphology, rheology and ageing properties of modified bitumens were studied using fluorescence microscopy, dynamic mechanical analysis, creep test (bending beam rheometer), and gel permeation chromatography.
235 citations
TL;DR: In this article, the Fourier transform infrared spectroscopy (FTIR) analysis was carried out using an integration method which considers the area below the absorbance spectrum around a band maximum using baseline and tangential approaches.
Abstract: This RILEM round robin study with nine participating laboratories investigated bitumen ageing, its effect on chemical properties and its reproducibility. The impact of temperature used for short-term (RTFOT) binder ageing on the combined short- and long-term (PAV) aged samples was investigated; thereby the effect of reduced mixing temperature such as those relevant for warm mix asphalt technologies on long term ageing was examined. Four 70/100 penetration graded bituminous binders from different sources were selected. In addition to the standard RTFOT temperature of 163 °C, two additional temperatures, 143 and 123 °C were used. The Fourier transform infrared spectroscopy (FTIR) analysis was carried out using an integration method which considers the area below the absorbance spectrum around a band maximum using baseline and tangential approaches. A statistical investigation into the reproducibility of FTIR spectra analysis based on the accumulated data was done. To assess the reproducibility, the coefficient of variation (CV) was taken as a benchmark parameter. Carbonyl and sulfoxide indices were calculated using different baseline correction methods and tangential and baseline integration, respectively. It was shown that the tangential method was not influenced by the applied baseline correction. However, in all considered cases, the tangential method led to significantly worse reproducibility (CVs ranging from 20 to 120%) compared to the baseline method. The sulfoxide indices calculated by both methods were not affected by the baseline correction method used. Impacts of changes in the short-term ageing temperature on short- or long-term aged samples could not be found whereas differences between different binder sources could be detected. RTFOT temperature and therefore mix production temperature had a stronger impact on the formation of sulfoxide structures than for carbonyl structures. The findings from this study show the most reproducible of all considered methods when more than one laboratory is providing FTIR data.
148 citations
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31 Oct 2001
TL;DR: The American Society for Testing and Materials (ASTM) as mentioned in this paper is an independent organization devoted to the development of standards for testing and materials, and is a member of IEEE 802.11.
Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.
3,792 citations
TL;DR: A general picture of bitumen structure is shown to emerge and it shows that a simple solvation parameter allows quantifying the effect of the asphaltenes on the rheological properties ofbitumen.
1,236 citations
TL;DR: In this paper, the authors describe the polymer modification of two penetration grade bitumens with SBS and show that the degree of SBS modification is a function of bitumen source, bitumen polymer compatibility and polymer concentration, with the higher polymer concentrations in a high aromatic content bitumen producing a highly elastic network which increases the viscosity, complex modulus and elastic response of the PMB.
634 citations
TL;DR: In this article, the history of bitumen polymer modification for road construction has been reviewed in the field of road construction during the last 40 years and the challenges and advances in the last decade.
582 citations
TL;DR: In this paper, new chemical compositions of model asphalts were proposed to enable molecular simulations that can further an understanding of asphalt physical, rheological, and mechanical properties, and the results provided an improved tool for relating asphalt chemical compositions to Rheological and Mechanical properties.
442 citations