Temperature dependency of dynamic mechanical properties of cement asphalt paste by DMTA method |
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| Authors: | Lei Fang Qiang Yuan Yunrui Pan Yong Wang Kamal Khayat Dehua Deng |
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| Affiliation: | 1.School of Civil Engineering, National Engineering Laboratory for Construction of High Speed Railway,Central South University,Changsha,China;2.Department of Civil, Architectural and Environmental Engineering,Missouri University of Science and Technology,Rolla,USA |
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| Abstract: | We investigated the temperature dependency of the dynamic mechanical properties of cement asphalt paste by the dynamic mechanical thermal analysis (DMTA) method. The experimental results show that the dynamic mechanical properties of cement asphalt pastes are sensitive to temperature due to the inclusion of asphalt, and may go through different states within a temperature range of -40 °C to 60 °C, which is different from that of pure cement and asphalt. As the temperature of the cement asphalt paste increases, a considerable change of dynamic mechanical properties, including storage modulus (E’), loss modulus (E”) and loss factor (tanδ) is observed. Moreover, the influence of asphalt to cement (A/C) ratio on the temperature sensitivity of the dynamic mechanical properties of cement asphalt composites was investigated. The temperature dependency of cement asphalt composites is ascribed to the temperature dependency of the asphalt and its interaction with cement paste. A simple fractional model is proposed to describe the viscoelastic behavior of cement asphalt composites. |
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