水泥稳定碎石分离式振动拌合试验研究

发布时间：2018-11-10 13:15

【摘要】：水泥稳定碎石基层具有强度高、稳定性好、造价低的优点,是一种广泛使用的基层类型。目前基层材料的生产技术已发展成熟,但搅拌工艺仍然以传统强制搅拌方式为主。经学者研究,提出水泥混凝土振动搅拌能提高搅拌质量和生产效率,本文基于相关增强机理展开关于水泥稳定碎石振动搅拌的研究。振动搅拌是通过搅拌作用使各物料在对流和扩散运动中均匀分布,以及振动作用破坏微小水泥团,达到加快水化反应速率、提高集料与水泥浆的表面结合力的效果。由于振动搅拌影响因素多,以及条件限制,本文着重研究振动作用,进行水泥稳定碎石分离式振动拌合试验。通过初步试验证实静态振动具有提高水泥稳定碎石抗压强度的作用,能够促进水化反应,但对含水率—干密度没有明显影响。通过正交试验与全因素试验,得到高效的振动参数,确定了振动时间与振动次数是主要影响因素,振动时间较短时,各组合参数的振动效果差异小,增加振动时间后振动效果与振动次数、振动功率呈正相关关系,振动功率不宜过低或过高。本文研究拌合方式、成型方式对试件抗压强度的影响,确定试件成型方法;与普通拌合的试件对比,研究养生龄期、水泥剂量、级配类型对力学性能、路用性能的影响规律;根据所采用的振动方式对振动搅拌进行改进设计,并提出对应的试验方案。
[Abstract]:Cement stabilized macadam base has the advantages of high strength, good stability and low cost. At present, the production technology of base material has been developed and mature, but the agitation process is still based on the traditional forced mixing method. Through the research of scholars, it is proposed that the vibration mixing of cement concrete can improve the mixing quality and production efficiency. Based on the relevant strengthening mechanism, the research on the vibration mixing of cement stabilized crushed stone is carried out in this paper. Vibration agitation is to make the materials distribute evenly in convection and diffusion motion by stirring, and to destroy the micro-cement mass by vibration, so as to speed up the hydration reaction rate and improve the surface bonding force between aggregate and cement slurry. Because there are many factors affecting vibration agitation, and conditions are limited, this paper focuses on the study of vibration effect, and carries out separate vibration mixing test of cement stabilized crushed stone. It is proved that static vibration can improve the compressive strength of cement stabilized macadam and promote hydration reaction, but it has no obvious effect on moisture content and dry density. Through orthogonal test and all-factor test, the high efficient vibration parameters are obtained, and the vibration time and times are determined as the main influencing factors. When the vibration time is short, the vibration effect of each combination parameter is small. When the vibration time is increased, the vibration effect is positively correlated with the frequency of vibration and the vibration power, and the vibration power should not be too low or too high. In this paper, the influence of mixing mode and forming method on the compressive strength of the specimen is studied, and the forming method of the specimen is determined, and compared with the ordinary mixing specimen, the influence of curing age, cement dosage, grading type on the mechanical properties and road performance is studied. According to the vibration mode, the vibration stirring design is improved, and the corresponding test scheme is put forward.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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