橡胶沥青混合料SAC-13级配空隙率变化分析  

Air Void Variation of Asphalt Rubber Mixture Grade SAC-13

作　　者：黄卫东[1] 黄明[1] 郑茂 李彦伟[3] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]四川省交通厅交通勘察设计研究院,成都610000 [3]石家庄市交通运输局,河北石家庄050051

出　　处：《同济大学学报（自然科学版）》2012年第5期685-690,共6页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金项目(50308021)

摘　　要：在普通沥青的多碎石沥青混凝土(SAC)设计的基础上,以空隙率为研究变量,采用固定油石比,再微调级配的方式,深入对比了SAC-13级配变化的普通沥青和橡胶沥青混合料的空隙率影响规律.结果显示:对于普通SAC-13沥青混合料,油石比每增加0.5%,空隙率减小1%～1.5%,随着9.5～13.2mm粗集料含量增多,4.75～9.5mm粗集料含量减少,混合料粗集料间隙率呈递减之势;对SAC橡胶沥青混合料,建议9.5mm以上集料用量范围限定在30%～45%之间,4.75～9.5mm集料用量范围限定在20%～40%之间,且4.75mm以上粗集料总用量应达到60%以上,2.36～4.75mm集料含量不宜高于10%,且不宜使用过多矿粉;同样目标空隙率下,SAC-13橡胶沥青混合料的粗集料掺量应略低于普通沥青混合料;SAC-13橡胶沥青混合料中当2.36～4.75mm集料含量达到8%以后,随着该档料用量的增加,空隙率增幅明显高于普通沥青混合料,需严格控制此档料含量.Based on the design of stone asphalt concrete（SAC） mixture of plain asphalt,a comparative study was made of the influence law of air void of SAC-13 grading on plain asphalt and asphalt rubber mixture with the air void as the variable by setting the asphalt content first and then fine-tune grading.The result shows that for normal SAC-13 mixture,when the oil-aggregate ratio increases by 0.5% each time,air void will decrease by 1% to 1.5% instead.With the increase of 9.5 - 13.2 mm coarse aggregate content,4.75 - 9.5 mm aggregate content and the void of coarse aggregates（VCA） will decrease by degrees.With regard to the SAC asphalt rubber mixture,aggregate content（9.5 mm） is recommended to be within 30% - 45% and the 4.75 - 9.5 mm be within 20%-40%,in addition,the total volume of coarse aggregate（4.75 mm） is proposed to be over 60%,2.36 - 4.75 mm aggregate content is not proposed to be over 10%,and mineral powder to be used little.With the same objective void,SAC-13 asphalt rubber mixture of coarse aggregate content is proposed to be slightly less than normal SAC mixture.As for SAC-13 rubber asphalt mixture,when the content of 2.36 - 4.75 mm aggregate reaches 8%,void increases much more distinctively than that of normal SAC mixture,so the content of this grade should be strictly controlled.

关 键 词：多碎石沥青混凝土(SAC) 橡胶沥青 级配 空隙率 

分 类 号：U414[交通运输工程—道路与铁道工程]