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首页> 外文会议>Asphalt Rubber 2009 Conference(2009国际橡胶沥青大会） >Steady Shear Properties of Crumb Rubber Modified Bitumen
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Steady Shear Properties of Crumb Rubber Modified Bitumen

机译：粒状橡胶改性沥青的稳定剪切性能

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The rheological properties of crumb rubber modified bitumen poses considerable challenges in terms of quantification. This investigation concerns the measurement of shear stress and normal stress difference when samples of crumb rubber modified bitumen were tested in a dynamic" shear rheometer in a steady shear mode for a range of temperature and shear rates. Two commercially available crumb rubbers (Ⅰ and Ⅱ) were blended with an air blown bitumen. Three different dosage rates were used and the testing was carried out. It is seen that the material exhibit considerable normal stresses and normal stress difference when subjected to shear. A coarser graded crumb rubber (crumb rubber-Ⅰ) results in considerable reduction in shear stress and normal stress difference for any dosage rate, shear rate and temperature. A finer graded crumb rubber (crumb rubber-Ⅱ) results in considerable higher stress-overshoot in shear stress and normal stress difference for any dosage rate, shear rate, and temperature. For a given crumb rubber type and temperature, as the shear rate is increased, the normal stress differences increases at a much higher rate than the shear stress. These measurements clearly depict the difference in terms of crumb rubber type and dosage rates. These kinds of fundamental rheological experiments, when appropriately interpreted, shed considerable light on the interaction of crumb rubber with bitumen.
机译：碎胶改性沥青的流变性质在定量方面提出了相当大的挑战。本研究涉及当在动态“剪切流变仪”中以恒定剪切模式在一定温度和剪切速率下对碎橡胶改性沥青的样品进行测试时，剪切应力和法向应力差的测量。两种市售的碎橡胶（Ⅰ和Ⅱ） ）与吹塑沥青共混，使用了三种不同的剂量率并进行了测试，结果表明该材料在受到剪切作用时表现出相当大的法向应力和法向应力差。 Ⅰ）在任何剂量率，剪切速率和温度下均能显着降低剪切应力和法向应力差，而细级的碎胶（crumbrubber-Ⅱ）则在任何剂量，剪切速率和温度下均会导致较高的切应力和法向应力差剂量率，剪切速率和温度对于给定的碎胶类型和温度，随着剪切速率的增加，法向应力差i以比剪切应力高得多的速率增加。这些测量清楚地描述了面包屑橡胶类型和剂量率的差异。这些基本的流变学实验，如果适当地加以解释，就可以清楚地了解碎胶与沥青的相互作用。

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