Development of a Simple Test to Determine the Low Temperature Creep Compliance of Asphalt Mixtures
Development of a Simple Test to Determine the Low Temperature Creep Compliance of Asphalt Mixtures
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发表时间：
2009-06
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通讯作者：
M. Marasteanu;R. Velasquez;A. C. Falchetto;A. Zofka
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作者：
M. Marasteanu;R. Velasquez;A. C. Falchetto;A. Zofka
This Innovations Deserving Exploratory Analysis (IDEA) project investigated the idea of performing creep tests on asphalt mixture beam specimens with the Bending Beam Rheometer (BBR). In the first part of the investigation a detailed beam preparation procedure was developed for both laboratory compacted and field cores. A detailed loading procedure was developed and it was determined that good results can be obtained using the current BBR device at 22 deg C and 10 deg C. Based on BBR and indirect tension (IDT) experimental data for 20 laboratory mixtures a simple linear relationship was obtained between the IDT creep stiffness and the BBR creep stiffness obtained at 22 deg C and 10 deg C. A similar relation could not be identified for the field samples. The representative volume element (RVE) of asphalt mixtures at low temperatures was investigated by performing three-point bending creep tests on beams of three different sizes. The finite element simulations for a homogeneous asphalt mixture produced similar results for IDT and BBR, within 4% of each other, similar to the experimental results for two polymeric materials. Additional simulations indicated that aggregate spatial distribution in asphalt mixtures is very important and aggregate structure within the mixture should be taken into account when using an inverse model to predict the properties of the mixture components. A number of micromechanics models were also evaluated. A draft specification for obtaining low temperature creep stiffness of asphalt mixtures using the BBR was developed and will be presented at the next Asphalt Mixture Expert Task Group meeting for further comments. A draft specification will be submitted to the American Society for Testing and Materials.
