在常用的各种力学模型中,修正Burgers模型是目前公认相对准确而又简单的模型,然而该模型只对静态荷载下混合料蠕变特性适用,且不能将延迟粘弹性变形与粘性流动变形区分出来,以此进行车辙预估必然导致预估车辙偏大。将修正Burgers模型看...在常用的各种力学模型中,修正Burgers模型是目前公认相对准确而又简单的模型,然而该模型只对静态荷载下混合料蠕变特性适用,且不能将延迟粘弹性变形与粘性流动变形区分出来,以此进行车辙预估必然导致预估车辙偏大。将修正Burgers模型看成是由三单元范德普(Van Der Poel)模型与修正的外置粘壶组成,就能将永久应变与弹性应变区分开来,更加合理。考虑耦合损伤的修正Burgers模型能反映混合料高温变形的三阶段,且当卸载时间为加载时间的10倍左右时,残余粘弹性变形占不到10%,可以略去不计。推导间歇加载半正矢波下混合料的本构模型,用origin7.5软件进行拟合,相关度0.99以上。最后提出基于耦合损伤力学模型的混合料高温性能评价新指标蠕变度和平均车辙深度。展开更多
The main objective of this work is to propose new mixture response parameters and to compare correlations with rut depths and sensitivity of permanent deformation response parameters based on field extracted cores and...The main objective of this work is to propose new mixture response parameters and to compare correlations with rut depths and sensitivity of permanent deformation response parameters based on field extracted cores and lab-mixed duplicates. A new "mix-confined" test is developed and four new parameters for this test are proposed. Correlation coefficients with rut depths and coefficients of variation (sensitivity) are compared between the four new and two existing parameters. Some parameters are recommended to be used for the newly developed test. The results show that, newly developed test can capture the changes of permanent deformation of asphalt mixtures. Only one new parameter (D1 of Stephen Price model) and one existing parameter (flow number, Fn ) have strong correlations with rut depths of asphalt pavements (R2 greater than 0.7) and have relative small sensitivity (coefficient of variation, COV, less than 30%). For polymer modified asphalt mixtures, the parameter D1 rather than Fn should be used. These findings can be used to check the permanent deformation of asphalt mixture during the mix design.展开更多
文摘在常用的各种力学模型中,修正Burgers模型是目前公认相对准确而又简单的模型,然而该模型只对静态荷载下混合料蠕变特性适用,且不能将延迟粘弹性变形与粘性流动变形区分出来,以此进行车辙预估必然导致预估车辙偏大。将修正Burgers模型看成是由三单元范德普(Van Der Poel)模型与修正的外置粘壶组成,就能将永久应变与弹性应变区分开来,更加合理。考虑耦合损伤的修正Burgers模型能反映混合料高温变形的三阶段,且当卸载时间为加载时间的10倍左右时,残余粘弹性变形占不到10%,可以略去不计。推导间歇加载半正矢波下混合料的本构模型,用origin7.5软件进行拟合,相关度0.99以上。最后提出基于耦合损伤力学模型的混合料高温性能评价新指标蠕变度和平均车辙深度。
基金Project(08Y038) supported by Jiangsu Transportation Engineering Construction Bureau,China
文摘The main objective of this work is to propose new mixture response parameters and to compare correlations with rut depths and sensitivity of permanent deformation response parameters based on field extracted cores and lab-mixed duplicates. A new "mix-confined" test is developed and four new parameters for this test are proposed. Correlation coefficients with rut depths and coefficients of variation (sensitivity) are compared between the four new and two existing parameters. Some parameters are recommended to be used for the newly developed test. The results show that, newly developed test can capture the changes of permanent deformation of asphalt mixtures. Only one new parameter (D1 of Stephen Price model) and one existing parameter (flow number, Fn ) have strong correlations with rut depths of asphalt pavements (R2 greater than 0.7) and have relative small sensitivity (coefficient of variation, COV, less than 30%). For polymer modified asphalt mixtures, the parameter D1 rather than Fn should be used. These findings can be used to check the permanent deformation of asphalt mixture during the mix design.
