Abstract: Brookfield viscometer and improvement of Brookfield viscometer were used to measure foamed asphalt, and 70# conventional asphalt and SBS modified asphalt were selected to produce foamed asphalt. Compared with two kinds of foamed asphalt viscosity measurement method, the results are as follows: asphalt bubbles influencing shear stress should be taken into consideration. Bubbles of 70# conventional asphalt influences viscosity a lot, and improvement of rotation viscosity is less than 70# conventional asphalt, but rotation viscosity is larger than 70# conventional asphalt. Because of larger viscosity of SBS modified asphalt, inerratic bubbles of asphalt have little effect on measurement of viscosity. Improvement of rotation viscosity and rotation viscosity are less than that of SBS modified asphalt. In order to measure the viscosity of foamed asphalt more accurately, it is suggested that the caliber of sample tube should be increased to avoid the influence of asphalt bulbbles on the shear stress.

Key words: road engineering;foamed asphalt;viscosity, contrast experiment, shear stress, bubbles of asphalt

摘要： 使用布氏黏度计与改进的布氏黏度计进行测量泡沫沥青黏度试验，选择70#道路石油沥青与SBS改性沥青制备泡沫沥青，对两种泡沫沥青的旋转黏度测量方法进行对比研究。结果表明： 测量泡沫沥青时须考虑沥青泡对转子剪切力的影响，70#道路石油泡沫沥青产生的沥青泡对其旋转黏度影响较大，其改进的旋转黏度小于70#道路石油沥青的旋转黏度，未改进的旋转黏度大于 70#道路石油沥青的旋转黏度；SBS改性泡沫沥青由于其旋转黏度较大，产生的规则椭球形沥青泡，对旋转黏度的测量影响不大，其改进的旋转黏度与未改进的旋转黏度均小于SBS沥青的旋转黏 度。为了更加准确测得泡沫沥青的旋转黏度，建议对布氏旋转黏度计进行改进，增大盛样筒的口径来避免沥青泡对转子剪切力的影响。

关键词: 道路工程, 泡沫沥青, 旋转黏度, 对比试验, 剪切力, 沥青泡