论文部分内容阅读
美国所有的屋面和防水用沥青基本都是石油沥青,是以空气吹制精选的石油物料或初次蒸馏的石油渣油而获得的。现行的屋面和防水用沥青的规格是ASTM标准规格。这些规格中规定的各种屋面和防水用沥青(包括卷材的浸涂沥青)都是根据环—球软化点测定仪测量的软化点来分级的,同时还规定了0℃、25℃、46.1℃下的针入度和25℃下延伸度。V.P.Puziauskas先生认为现行的屋面和防水用沥青规格的制定中存在严重的局限性和缺陷,并引入能代表材料真实和基本的稠度——“粘度”的概念,论述了不同温度下的粘度与饮化点和计八度之间的关系以及粘度在沥青规格制定中的意义。(由于原文较长本刊篇幅有限,故删去部分译文,仅向译者致以歉意。)
All asphalt used for roofing and waterproofing in the U.S. is basically petroleum bitumen, which is obtained by blowing selected petroleum materials or primary distillation of petroleum residue. The current specifications for roof and waterproof asphalt are ASTM standard specifications. The various types of roofing and waterproofing asphalt specified in these specifications (including dipping asphalt for coiled materials) are graded based on the softening point measured by a ring-ball softening point tester, and also specified 0°C, 25°C, 46.1. Penetration at °C and extension at 25 °C. Mr. VPPuziauskas believes that there are serious limitations and defects in the current formulation of asphalt for roofing and waterproofing, and introduces the concept of “viscosity” that can represent the true and basic consistency of the material, and discusses the viscosity and drinking at different temperatures. The relationship between point and octave and the significance of viscosity in bitumen specification. (Because the original text is longer than the length of the publication, some of the translations are deleted and only the translator is apologetic.)