搅拌工艺对沥青混合料搅拌均匀性的影响

发布时间：2018-05-23 18:18

本文选题：沥青搅拌器 + 搅拌工艺　；参考：《长安大学》2015年硕士论文

【摘要】：伴随着我国公路交通事业的迅猛发展,人们对沥青路面的质量和使用寿命要求也越来越高。沥青混合料搅拌设备作为路面机械化施工的关键设备,其性能和水平直接决定着混合料的生产质量和效率。目前国内外对沥青混合料搅拌工艺方面的研究较少,这使得大多数用户在生产时仍是根据以往经验来调整搅拌工艺参数的,没有严格的理论依据和试验数据,缺乏科学性,常会造成所制备沥青成品料质量无法满足使用要求,从而引发沥青路面的早期破坏,降低其使用寿命。本文在明确搅拌目的和机理的基础上,针对沥青混合料搅拌过程的特殊性,分析了投料位置、投料顺序、投料持续时间、充盈率以及搅拌时间等工艺参数对搅拌均匀性、搅拌效率和搅拌能耗的影响。结合理论分析,运用EDEM离散元软件仿真模拟了不同参数对混合料搅拌效果的影响,为了验证分析的正确性,设计了相关试验方案,并在此基础上进行了工地现场试验和实验室试验。试验结果表明:(1)投料位置对搅拌均匀性的影响程度是最显著的,它主要影响着材料的初始分布均匀性,进而对搅拌质量和搅拌效率产生影响。横向中央布置的投料位置形式优于横向单侧布置和轴向端部布置。(2)投料持续时间主要影响着材料进入拌锅的速率,它也是影响混合料搅拌质量和效率的一项重要工艺参数。随着粉料投料持续时间的延长,混合料的搅拌均匀性有所改善,这得益于粉料投入搅拌器的速率较慢,可以实现充分分散,降低了与沥青胶结成团的概率,从而提高了混合料的搅拌质量。(3)充盈率除影响搅拌器的搅拌质量和生产能力外,还对搅拌能耗有着显著影响。在相同搅拌时间条件下,增大充盈率,可以提高搅拌器的生产率,但是搅拌功率和搅拌不均匀性也随之增加。当充盈率超过60%继续增大时,这种影响就更为显著,此时需要适当延长搅拌时间才能保证混合料的搅拌质量,而这实际降低了搅拌器的生产率。
[Abstract]:With the rapid development of highway transportation in China, the quality and service life of asphalt pavement are required more and more. Asphalt mixture mixing equipment is the key equipment of road mechanization construction. Its performance and level directly determine the production quality and efficiency of the mixture. At present, there is little research on asphalt mixture mixing process at home and abroad, which makes most users adjust the mixing process parameters according to previous experience, without strict theoretical basis and test data, lack of scientific. The quality of asphalt finished material can not meet the requirement of use, which can lead to the early destruction of asphalt pavement and reduce its service life. According to the particularity of the mixing process of asphalt mixture, this paper analyzes the mixing uniformity of the process parameters such as the feeding position, feeding sequence, feeding duration, filling rate and mixing time on the basis of clear mixing purpose and mechanism. The effect of stirring efficiency and energy consumption. Combined with theoretical analysis, the influence of different parameters on mixing effect of mixture is simulated by using EDEM discrete element software. In order to verify the correctness of the analysis, the related test scheme is designed. On this basis, site tests and laboratory tests were carried out. The results show that the influence of feeding position on the mixing uniformity is the most significant, which mainly affects the initial distribution uniformity of the material, and then affects the mixing quality and the agitation efficiency. The feeding position of lateral central arrangement is superior to that of lateral unilateral arrangement and axial end arrangement. The feeding duration mainly affects the rate of material entering into the mixing pot, and it is also an important technological parameter affecting the mixing quality and efficiency of mixture. With the prolongation of the powder feeding time, the mixing uniformity of the mixture is improved, which is due to the fact that the powder is put into the agitator at a slower rate, which can achieve full dispersion and reduce the probability of agglomeration with asphalt. Thus, the mixing quality of the mixture is improved. The filling ratio not only affects the agitator's mixing quality and production capacity, but also has a significant effect on the mixing energy consumption. Under the same stirring time, the productivity of agitator can be improved by increasing the filling ratio, but the mixing power and inhomogeneity also increase. When the filling ratio is more than 60%, the effect is more obvious. In this case, the mixing quality can be guaranteed by prolonging the mixing time properly, which actually reduces the agitator productivity.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

【参考文献】