矿料粒径对拌和时间的影响与梯次拌和技术

发布时间：2018-04-08 16:20

本文选题：机械工程　切入点：沥青混合料　出处：《中国公路学报》2017年10期

【摘要】：为了研究双卧轴搅拌器在分批拌和沥青混合料的过程中粗细集料、矿粉和沥青的投料顺序对混合料质量与拌和效率的影响,通过建立搅拌模型分析集料颗粒在搅拌器作用下的滚动规律;根据滚动过程中颗粒表面发生沥青迁移的拌和机理,得出在沥青迁移量以一定速率递减的条件下,拌和均匀性与颗粒滚动圈数之间的关系表达式。用不等直径平面圆模型求得拌和过程中不同粒径颗粒之间的滚动关系,提出达到相同油膜厚度的粗集料、细集料、矿粉与沥青之间的梯次拌和工艺;研发了与实体工程中使用的搅拌器结构和搅拌原理相同的实验室用双卧轴搅拌机,并对AC-16混合料进行了试验研究。结果表明:在同一拌和过程中,颗粒大小不同时滚动次数有差异,矿粉滚动次数大于细集料,细集料滚动次数大于粗集料,导致不同粒径颗粒表面裹覆的油膜厚度发生变化;采用梯次拌和工艺可以提高沥青混合料的质量和设备生产效率,较之传统拌和工艺得到的沥青用量有所降低,并可减少约30%的拌和时间。
[Abstract]:In order to study the effect of coarse aggregate, mineral powder and asphalt feeding sequence on mixture quality and mixing efficiency during batch mixing of bituminous mixture with double horizontal axis mixer,The rolling law of aggregate particles under the action of agitator is analyzed by establishing a mixing model, and according to the mixing mechanism of asphalt migration on the surface of particles during rolling, it is concluded that under the condition that the amount of asphalt migration decreases at a certain rate,The expression of the relation between mixing uniformity and the number of rolling circles.The rolling relation between different particle sizes in mixing process was obtained by using the plane circle model with unequal diameters, and the trapezoidal mixing process of coarse aggregate, fine aggregate, ore powder and asphalt with the same oil film thickness was put forward.A laboratory double horizontal shaft mixer with the same structure and principle as the agitator used in solid engineering was developed, and the AC-16 mixture was tested.The results show that in the same mixing process, the rolling times of different particle sizes are different, the rolling times of ore powder are larger than those of fine aggregates, and the rolling times of fine aggregates are larger than those of coarse aggregates, which results in the change of oil film thickness on the surface of different particle sizes.The quality of asphalt mixture and the production efficiency of equipment can be improved by using the ladder-mixing process. Compared with the traditional mixing process, the asphalt dosage can be reduced, and the mixing time can be reduced by about 30%.
【作者单位】：长安大学道路施工技术与装备教育部重点实验室;长安大学公路学院;内蒙古高等级公路建设开发有限责任公司;
【基金】：“十二五”国家科技支撑计划项目(2011BAE28B03) 中央高校基本科研业务费专项资金项目(2014G3252006) 内蒙古交通科技项目(NJ-2016-20)
【分类号】：U414

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