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基于传热学和材料学原理,进行了改性沥青中掺入高折光指数的纳米填料TiO2、SiO2的热反射试验,以提高沥青混凝土的反射率,降低吸收率及路面温度。按改性沥青:2%、4%、6%线型/星型SBS+基质沥青,2%、4%、6%TiO2/SiO2+基质沥青,6%线型SBS+2%,4%,6%TiO2+基质沥青的配比制作试样,利用实验室简易法测定各种类型沥青的热反射效果。试验结果表明,线型/星型SBS对沥青热反射的影响不大,折光指数高的纳米材料TiO2及SiO2能明显地提高改性沥青的反射率;与基质沥青相比,掺加6%线型SBS和6%TiO2的改性沥青表面温度减低超过5,可以有效地提高沥青的反射率,从而降低了路面温度及带来的温度应力破坏,有一定的应用前景。 相似文献
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Transient response of a spherical cavity with a partially sealed shell embedded in viscoelastic saturated soil 总被引:1,自引:0,他引:1
INTRODUCTION The propagation of stress-waves in an elasticmedium containing a cavity that are due to arbitrarydynamic loading applied on the cavity is of greatimportance in the fields of seismology, geophysicalprospecting, underground tunnels and deeply buriedpipelines, particularly as a model of an earthquakesource. Ben-Menahem and Cisternas (1963) devel-oped the theory for the dynamic response of an elastichalf-space medium to an explosion spherical cavity.Norwood and Miklowitz (… 相似文献
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