flexural stiffness resilient modulus shear stiffness Strategic Highway Research Program National Research Council 2101 Constitution Avenue N.W. The stiffness modulus of bituminous mixtures is fundamental to the analysis of the stress–strain response of pavement under traffic loading. 0000146883 00000 n Model parameters (Jäger et al. Multigrade bitumen is manufactured from the same sources as conventional bitumen but requires processing to reduce temperature susceptibility. It can be measured using various methods such as the resilient modulus test, indirect tensile test and uniaxial direct tensile test. J Appl Chem Biotech 23:139–140, Bonnaure F, Gest G, Gervois A, Uge P (1977) A New method of predicting the stiffness of asphalt paving mixtures. This service is more advanced with JavaScript available, Viscoelastic Properties of Asphalts Based on Penetration and Softening Point In: Proceedings of 1st international congress of rheology, vol 2. These characteristic properties are analogous to Young' modulus and Poisson's ratio of elastic materials. The parameters of CA model were related to the bitumen properties based on Van der Poel’s experimental data. 12.5.3 Stiffness Modulus. The HMAs investigated were produced using aggregate and bitumen of different types. <<485eca0bc886d344a8d2585e9bad56af>]>> 0000116228 00000 n Discover the world's research 17+ million members … Rheological tests, in which the stress distribution in the material is simple and controlled, appear interesting to gain relevant observations concerning the thixotropic behavior of bitumens. National Asphalt Pavement Association, Lanham, MD, Saal RN (1955) Mechanical testing of asphaltic bitumen. According to compatibility parameter (CP) data, limestone and quartzite had the most … Thomas Telford Ltd, London, Ullidtz P, Larsen BK (1984) Mathematical model for predicting pavement performance. Monitoring of the stiffness modulus could provide a clearer picture of the process of deterioration and recovery that occurs during an immersion-drying cycle. Modulus of rigidity, Flexural creep, Stiffness, Binding agents, Bitumens, Creep testing, Bend testing, Test equipment, Bituminous products : ICS: 75.140 91.100.50: Title in French: Bitumes et liants bitumineux. This study is to compare the results of temperature sensitivity tests of foamed bitumen asphalt concrete (AC 8) compacted at 95 °C with that of the reference mixture compacted at the conventional temperature of … 0000115818 00000 n %PDF-1.3 %���� startxref In general, the conclusion could be drawn that the stiffness modulus is not dependent on applied indirect tensile stress for all test temperatures. As mathematical model for describing the stiffness of bitumen, Christensen and Anderson (CA) equation was used. Four CS were used. 0000000016 00000 n indirect tensile stiffness modulus (ITSM)3, the dynamic modulus at different temperatures and frequencies and the correlation between them. stiffness modulus, resistance to permanent deformation and resistance to fatigue cracking. Analysis of IT-CY Stiffness Modulus of Foamed Bitumen Asphalt Concrete Compacted at 95 °C. The instantaneous value for longitudinal modulus was obtained by extrapolation of values for stiffness modulus according to Van der Poel at low temperatures and small load durations. Key Words: Computer program, dynamic deflection, elastic modulus, pavement design, stiffness coefficients, surface deflections. 0000146032 00000 n 0000145758 00000 n © 2020 Springer Nature Switzerland AG. With the purpose of extrapolation, the model developed to describe the viscoelastic properties of amorphous glass forming polymers was applied. (2006) developed the following equation to correct the compliance errors caused by the aRES rheometer: (1) where K* mes is the measured complex torsional stiffness, K* s is the actual complex sample torsional stiffness and K t is Using developed equation, stiffness modulus of bitumen can be easily calculated in a wide range of temperatures and loading time. 0000146381 00000 n 2010)..... 2 2.1.2. The parameters of CA model were … This bitumen stiffness is then modified by using a second nomograph to consider volume per­ centages of aggregate and asphalt cement to give a stiffness or modulus value for the mix. This chapter deals with the development of equation that expresses the bitumen stiffness modulus as a function of time, temperature and the simple properties of bitumen such as penetration (or penetration index) and softening temperature. Instead, the stiffness modulus depends on rise-time, mainly in the case of high temperatures. The analysis of temperature sensitivity was conducted based on the measured indirect tensile stiffness modulus, Sm, (IT-CY) at -10°C, 0°C, 10°C and 25°C. 0000147059 00000 n 0000115063 00000 n THE MODULUS AND POISSON'S RATIO OF ASPHALT MIXES. The Pennsylvania State University, Thesis, Christensen D, Anderson D (1992) Interpretation of dynamic mechanical test data for paving grade asphalt cements. 0000197396 00000 n 0000198886 00000 n In order to obtain a clearer understanding of the mechanisms causing the improvements in properties, some basic studies were carried out. J AAPT 38:123–135, Drozdov AD (2001) A model for the viscoelastic and viscoplastic responses of glassy polymers. In: Proceedings, Association of Asphalt Paving Technologists, vol 46, pp 64–100, Christensen DW (1992) Mathematical modeling of the linear viscoelastic behavior of asphalt cements. In addition, the complex bulk modulus K∗(ω) and The stiffness modulus obtained on the specimens compacted with 2*75 blows, i.e. 0000230886 00000 n 0000001837 00000 n To express the zero-shear viscosity of bitumen as a function of temperature based on Van der Poel’s data, the parameters of time-temperature superposition function were related with the penetration index of binder. Results showed that the addition of capsules reduced the stiffness of asphalt mixture and bigger capsules caused more stiffness loss. Prentice Hall Inc, New Jersey, Lesuer D, Gerard J-F, Claudy P, Letoffe J-M, Planche J-P, Martin D (1997) Relationships between the structure and the mechanical properties of paving grade asphalt cements. This makes it unclear where the optimum of foaming parameters is, because, for example, the settings at which high quality bitumen foam can be obtained coincide with a change in bitumen stiffness. It is also possible to use the following notations: E∗= E 1 + iE 2 with the storage modulus E 1 and the loss modulus E 2. the complex modulus or stiffness modulus and ϕis the phase angle of the material (for example used to estimate the energy dissipated in the material). The mineral aggregates used in this study were milled from different locations of the R35, near Bethal. x�b```b``1c`e`�de@ Q��_:g�k��cP^��v��k�0�ư���FC~�����$��e��N�x���|T�H@e�4'�$���^�h��&�©�Y�d��9��/�C&ѿK" Mc�jdbi����vE�ʣP���N��c"?��. 0000001433 00000 n 0000002105 00000 n In: 4th world petroleum congress, Rome, Section VI/A, Paper 3, pp 1–17, Schmidt RJ, Santucci LE (1965) A practical method for determining the glass transition temperature of asphalts and calculation of their low temperature viscosities. Modulus of bitumen Improved model for describing the stiffness modulus value decreases with increasing temperature of stress–strain... 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