| Parameter Characterisation of Asphalt Mixtures for Visco-Elastoplastic Analysis |
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| 作者姓名： | 陆阳 廖敬梅 廖军 |
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| 作者单位： | SchoolofCivilEnginnering,SouthwestJiaotongUniversity,Chengdu610031,China |
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| 摘 要： | Asphalt mixtrues exhibit strong viscous properties under repetitive loads.This phenomenon can be simulated in creep and recovery tests.By applying the visco-elastoplastic model proposed,data recorded in the tests are interpreted.It is emphasised that applicability of the visco-elastoplastic model depends on the proper method of characterising parameters involved in the constitutive equations.Since two or more strain components of elasticity and viscosity coexist during the loading or unloading,a measuring system of two loggers is introduced to decouple these components.Test data are analysed in three steps as elastic.visco-elastic and visco-plastic evaluations,using the records collected at the moment of unloading,during the periods of recovery and creep respectively,Factors that may influence the accuracy of data analysis are also discussed.
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| 关 键 词： | 粘弹塑性 沥青混合料 力学性能 性能测试 参数演化 |
Parameter Characterisation of Asphalt Mixtures for Visco-Elastoplastic Analysis |
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| Abstract: | Asphalt mixtures exhibit strong viscous properties under repetitive loads. This phenomenon can be simulated in creep and recovery tests. By applying the visco-elastoplastic model proposed, data recorded in the tests are interpreted. It is emphasised that applicability of the visco-elastoplastic model depends on the proper method of characterising parameters involved in the constitutive equations. Since two or more strain components of elasticity and viscosity coexist during the loading or unloading, a measuring system of two loggers is introduced to decouple these components. Test data are analysed in three steps as elastic, visco-elastic and visco-plastic evaluations, using the records collected at the moment of unloading, during the periods of recovery and creep respectively. Factors that may influence the accuracy of data analysis are also discussed. |
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| Keywords: | visco-elastoplastic asphalt mixtures creep and recovery tests parameter evaluation |
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