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3 材料要求 3.1 沥青结合料 德国重载路面SMA结合料针入度级,沥青用B65级,改性沥青用Pm 45级;北欧国家采用较软结合料,如瑞典用B85,B120,B180或改性沥青;荷兰采用B80级;挪威则根据交通量选择沥青等级,随着交通量增加,沥青等级从B80～180到B40～85直至采用改性沥青;而南欧地区则规定使用改性沥青,如意大利改性沥青规定针入度为45～55,软化点为75～85℃。葡萄牙也只许用改性沥青。 美国根据铺路工程现场气候条件和交通条件,选择满足MP-1要求的结合料性能等级。当应用
3 Material Requirements 3.1 Asphalt binder The German heavy-duty pavement SMA binder needle penetration grade, asphalt with B65 grade, modified asphalt with Pm 45 grade; the Nordic countries with softer binder, such as Sweden with B85, B120, B180 or change Bitumen is used in the Netherlands; B80 is used in the Netherlands; Bitumen is selected in Norway as a function of traffic, with bitumen grades ranging from B80-180 to B40-85 with modified bitumen as traffic volume increases; and in southern Europe, modified bitumen is required Italy modified asphalt provisions of penetration 45 ~ 55, softening point of 75 ~ 85 ℃. Only modified asphalt is allowed in Portugal. According to pavement construction site climate conditions and traffic conditions, the United States choose to meet the MP-1 requirements of the binder performance level. When applied