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【单选题】
采用马歇尔方法进行沥青混合料配合比设计时,涉及的主要步骤有: ①估计制备一个马歇尔试件所需拌和料数量,称取伴和好的混合料进行初次击实成型; ②计算出一组试件所需的各原材料用量,在规定的温度下加热待用; ③采用马歇尔仪进行马歇尔试验; ④根据混合料试件吸水率大大小,选择合适方法进行混合料密度的测定; ⑤根据初次成型制备的试件高度,进行必要的材料用量修订后,再次击实成型马歇尔试件; ⑥依据道路等级、气候特点、交通状况及路面结构部位等因素,选定适宜的沥青混合料类型; ⑦根据不同沥青用量和各参数之间的变化规律,分析确定最佳沥青用量; 指出进行马歇尔试验的正确步骤()。
A.
⑦-⑥-①-②-⑤-④-③
B.
⑦-⑥-②-①-⑤-③-④
C.
⑥-①-②-④-⑤-③-⑦
D.
⑥-②-①-⑤-④-③-⑦
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