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不完整的蠕变方法在抗车辙沥青材料中的应用
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One of the most difficult problems in materials testing is the rapid evaluation of long term material performance. An effective test method requires that the material properties used as predictors are both relevant and convenient to determine. For bituminous materials various rheological functions have been proposed as being appropriate for the assessment of resistance to rutting. For example the SHRP standard procedures, recently introduced in the United States, require the use of the norm of the complex modulus divided by the sine of the phase angle, çG*ç / sin d. Other workers suggest that the low shear limit of the viscosity h0, is likely to be more generally applicable. Unfortunately, for some materials, including many polymer modified bitumens, dynamic methods of determining h0 cannot be used; an alternative is to use a creep test. A drawback of such a test in its normal operating mode is that it needs to be run until steady state has been achieved. In the method of incomplete creep the use of the Boltzmann superposition principle makes this condition unnecessary. In this paper the method is used to determine h0 for a range of modified and unmodified bitumens. It is further shown how çG*ç / sin d can be calculated numerically from such a test. |
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- 附件 1 : 不完整的蠕变方法在抗车辙沥青材料中的应用.PDF
2016-06-30 15:30:06, 654.9 K
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