Showing papers on "Asphalt concrete published in 2018"
TL;DR: In this article, the effect of steel fibres (manufactured and/or recycled fibres) on the fresh and mechanical properties of rubberised concrete (RuC) comprising waste tyre rubber (WTR).
81 citations
TL;DR: In this article, the deicing and anti-icing performance of an innovative pavement surface layer that replaces asphalt binder with polyurethane using laboratory tests was investigated and it was found that polyurehane concrete has similar thermal conductivity but much greater specific heat as compared to asphalt concrete.
81 citations
TL;DR: In this article, carbon black (CB) was added to asphalt binder as a conductive component to increase the electro-magnetic sensitivity of asphalt concrete and to accelerate the heating and healing rate of this material.
79 citations
TL;DR: In this article, the anti-icing and deicing performance of super-hydrophobic asphalt concrete at different working conditions was compared to the traditional asphalt concrete through the combination of simulation test and theoretical analysis.
73 citations
TL;DR: In this paper, a reference Asphalt Concrete mixture (AC 16 S, named this paper in the article) was designed and dosed for comparing it with the experimental mixtures in which bitumen was reduced by different percentages and replaced by polymers.
71 citations
TL;DR: In this paper, the fatigue behavior of microcapsule-induced self-healing asphalt concrete was investigated, and it was concluded that the addition of 3wt% microcapsules can double the fatigue life of the AC-10 asphalt mixture.
70 citations
TL;DR: In this article, the volume-averaged energy equation with phase dependent thermal properties is used to analyze the heat transfer process in the integrated phase change materials (PCM) pavement system, and the effective thermal conductivity has a strong effect on the temperature distribution throughout the surface layer of PCM-embedded pavement system.
67 citations
TL;DR: In this article, the integration of basic oxygen furnace (BOF) steel slag into Sasobit WMA technology would indicate satisfactory performance in terms of moisture susceptibility and stripping resistance.
63 citations
TL;DR: In this article, the authors investigated the effects of different design parameters of asphalt concrete and environmental conditions on the thermal properties (thermal conductivity, diffusivity and volumetric heat capacity).
62 citations
TL;DR: In this article, the optimal type and concentration of fibers necessary to reinforce and enhance the mechanical properties of asphalt concrete was found. And the results showed that most of the fiber-reinforced asphalt concretes provided significantly improved mechanical performances compared to the plain asphalt concrete specimen.
61 citations
TL;DR: In this paper, the thermal behaviors of pavements with various paving materials and their impacts on the thermal conditions of the surrounding environment were investigated with specially designed laboratory simulation tests with four commonly used paving materials, traditional Portland cement concrete (PCC), Portland cement porous concrete (PCPC), dense-graded asphalt concrete (AC), and open-graded friction course (OGFC).
TL;DR: In this paper, the authors investigated the crack healing ability of activated carbon (AC) modified asphalt concrete through microwave radiation and found that AC is a potentially viable and robust binder-based conductive component for induced heating and healing of asphalt concrete.
TL;DR: In this paper, three types of nanoparticles were used: silica, zero-valent iron and bentonite to evaluate the effects of nanomodifications in the asphalt mixture performance.
TL;DR: In this article, the use of glass macrofibers in asphalt concrete mixtures was explored and the results showed that the added fibers increased the first peak fracture stress and gave higher residual stress capacity.
TL;DR: The performed test indicated that the source of bitumen and its production process had a significant impact on the low-temperature performance of the asphalt mixtures, comparable to the impact of binder modification and the aggregate skeleton used in the mixture.
Abstract: Low-temperature cracking is one of the most common road pavement distress types in Poland. While bitumen performance can be evaluated in detail using bending beam rheometer (BBR) or dynamic shear rheometer (DSR) tests, none of the normalized test methods gives a comprehensive representation of low-temperature performance of the asphalt mixtures. This article presents the Bending Beam Creep test performed at temperatures from −20 °C to +10 °C in order to evaluate the low-temperature performance of asphalt mixtures. Both validation of the method and its utilization for the assessment of eight types of wearing courses commonly used in Poland were described. The performed test indicated that the source of bitumen and its production process (and not necessarily only bitumen penetration) had a significant impact on the low-temperature performance of the asphalt mixtures, comparable to the impact of binder modification (neat, polymer-modified, highly modified) and the aggregate skeleton used in the mixture (Stone Mastic Asphalt (SMA) vs. Asphalt Concrete (AC)). Obtained Bending Beam Creep test results were compared with the BBR bitumen test. Regression analysis confirmed that performing solely bitumen tests is insufficient for comprehensive low-temperature performance analysis.
TL;DR: Improved design proposals on the construction scheme of asphalt pavement are addressed to control the strain of the established asphalt concrete course in relatively low level and validate the feasibility and reliability for the long-term monitoring.
Abstract: The durability, robustness, and long-term stability of optical-fiber-based sensors applied to practical engineering have always been challenging problems. Refer to the sensors embedded in asphalt pavements, the situation becomes serious and feasible sensors with enhanced function are in high demand. Therefore, an improved design to configure the quasi-distributed and distributed optical fiber sensors and FBG-based point sensors for monitoring the three-dimensional information of multilayered asphalt pavements is needed. The in-field data declare that the transversal, longitudinal, and vertical deformations of the tested urban asphalt pavement are mainly affected by temperature. The M-shape strain profile induced by heavy vehicles can decrease to the regular state in approximately 30 min after unloading. The tested asphalt pavement presents good structural performance to bear the tensile strain and permanent deformation. The high survival ratio and the good robustness of the proposed sensors against the harsh construction and operation environment validate the feasibility and reliability for the long-term monitoring. Improved design proposals on the construction scheme of asphalt pavement are also addressed to control the strain of the established asphalt concrete course in relatively low level.
TL;DR: In this paper, a flexible asphalt-mastic packaged optical fiber sensor was developed for distributed strain monitoring of asphalt pavement, and theoretical analysis on strain transfer of the optical fibre-based sensors embedded in asphalt pavement was conducted to improve the design of the protective layer and remove the strain transfer error.
Abstract: Strain distribution of asphalt pavement varies in transverse and longitudinal directions, and distresses, such as cracks, ruts and settlements, often occur randomly, which can be efficiently measured by distributed optical fibre sensing technology. As bare optical fibre is weak to resist shear and torsion forces during pavement construction, the protective technique is required. Therefore, a flexible asphalt-mastic packaged optical fibre sensor was developed in this research for distributed strain monitoring of asphalt pavement. Theoretical analysis on strain transfer of the optical fibre-based sensors embedded in asphalt pavement was conducted to improve the design of the protective layer and remove the strain transfer error. Afterwards, laboratory tests on the asphalt concrete beam were carried out to validate the performance of the sensor. Finally, the proposed sensors were applied to detect the in situ performance of urban asphalt pavement under temperature and traffic loads. The results indic...
TL;DR: In this article, material properties, along with structural layer characteristics and external factors such as external factors, are considered among the driving modes of flexible pavement deterioration in asphalt concrete (AC) layers.
Abstract: Cracking in asphalt concrete (AC) layers is among the driving modes of flexible pavement deterioration. Material properties, along with structural layer characteristics and external factors such as...
TL;DR: In this paper, a numerical model for the prediction of temperatures in asphalt pavement under real weather conditions, and accounting also for the presence of phase change materials (PCM) in asphalt concrete pavement was developed and validated.
TL;DR: In this article, a single-phase and two-phase electrically conductive asphalt mastic (ECAM) was used for anti-icing and deicing applications, where the volume resistivities of ECAMs were measured at two different temperatures and the influence of temperature on electrical conductivity was evaluated.
TL;DR: In this paper, a straightforward procedure to characterize the nonlinear viscoelastic response of asphalt concrete materials is proposed, and a model is proposed to estimate the non-linear viscous response of concrete materials.
Abstract: This paper proposes a straightforward procedure to characterize the nonlinear viscoelastic response of asphalt concrete materials. Furthermore, a model is proposed to estimate the nonlinear viscoel...
TL;DR: In this paper, a procedure to treat ladle furnace slag and make it suitable for the application in asphalt concrete (AC) was defined and the volumetric and mechanical properties of the AC containing LFS were determined.
TL;DR: In this article, the authors investigated the fracture properties of asphalt concrete through three-dimensional (3D) 3D models and found that crack distress causes asphalt pavement failure under repeated traffic loading.
Abstract: Crack distress causes asphalt pavement failure under repeated traffic loading. The objective of this study is to investigate the fracture properties of asphalt concrete through three dimensional (3...
TL;DR: In this article, the authors developed approximate relationships for prediction of the rheological properties and tensile strength of asphalt concrete with conventional bitumen binder to address the low-temperature cracking analysis.
Abstract: The objective of this study was to develop approximate relationships for prediction of the rheological properties and tensile strength of asphalt concrete with conventional bitumen binder to address the low-temperature cracking analysis. The parameters of modified Christensen–Anderson–Marasteanu model for relaxation modulus of bitumen were related with its penetration index and softening point by approximate formulas based on Van Der Poel's nomograph for determining bitumen stiffness. Hot mix asphalt relaxation function has been described by the Christensen–Bonaquist model. Hot mix asphalt tensile strength as a function of loading time and temperature was related to the bitumen stiffness by equation based on Heukelom's data and the Molenaar-Li empirical formula. The strength of hot mix asphalt has been also studied by performing tensile tests at constant strain rate and temperatures. The results were analysed considering the calculated stress increase with temperature drop at various cooling rates. Critic...
TL;DR: In this paper, the effects of freeze-thaw on asphalt concrete and binder samples in the laboratory were investigated, and the results showed that the FT conditioning decreases the fatigue life of the pavement by 30.7, 33.3, 46.7 and 37.23%.
TL;DR: In this paper, a laboratory and field evaluation of crumb rubber-modified and traditional asphalt concrete mixtures was conducted to ascertain the resilient modulus, indirect tensile strength, and permanent deformation of the modified asphalt mixtures.
Abstract: Research studies often propose additives to improve the mechanical properties that extend pavement service life by reducing the rate of permanent deformation of conventional asphalt mixtures. However, questions remain regarding the consistency and efficacy of additives compared to the conventional mixtures, particularly under different conditions of loading and climate inherent to various countries and locations. To shed further light, this paper presents a laboratory and field evaluation of Marshall and Superpave Gyratory-compacted crumb rubber-modified and traditional asphalt concrete mixtures. A laboratory-based study was conducted to ascertain the resilient modulus, indirect tensile strength, and permanent deformation of crumb rubber-modified asphalt mixtures. The Marshall stability and resilient modulus of mixtures prepared with crumb rubber-modified mixtures were increased on average by 30 and 43%, respectively, as compared to the control mixtures, whereas the permanent deformation of the crumb rubber-modified mixtures was improved on average by 12% in contrast to the control mixtures. Field investigations on short-term effectiveness revealed crumb rubber-modified asphalt mixture treatment exhibited on average 36.16% drop in International Roughness Index. In contrast, the control mixture pavement showed 24.20% drop in International Roughness Index. The results indicate and quantify the extent to which crumb rubber improves the performance of the conventional mixtures, in terms of the performance criteria specified.
TL;DR: In this article, the authors examined both the elastic and permanent components of displacements induced in geogrids by using mechanical extensometers attached to the geogrid structures, and showed that the presence of geoglids in asphalt overlays results in a lateral restraining mechanism that influences on the mechanical behavior of flexible pavements.
TL;DR: In this paper, the authors investigated the impacts of inner air-void structures on the high temperature performance of dense-graded asphalt concrete, and the digital models of rutting plate composed of asphalt mastics, coarse aggregates and porosity were constructed by the discretized emulating software PFC 3D.
TL;DR: In this article, the authors developed an algorithm for generating the 3D heterogeneous microstructure of asphalt concrete based on random modeling. The asphalt concrete was modeled as a het...
Abstract: This paper develops an algorithm for generating the three-dimensional (3D) heterogeneous microstructure of asphalt concrete based on random modeling. The asphalt concrete was modeled as het...
TL;DR: In this article, the effect of fine aggregate angularity (FAA) on skid-resistance of asphalt pavement was investigated by using the Model Mobile Load Simulator (MMLS3).