The Influence Of Vibratory Mixing And Vibratory Compaction On The Performance Of The Cement Concrete

Molding is one of the necessary processes for the construction of concrete.Quality evaluation indexs of commercial concrete are often based on laboratory test.Manual tamping,Insert vibrating molding,Shaking table forming is a commonly used method in the laboratory.It is found that there is a great difference between specimens and the actual engineering strength data after common mixing station was adopted these kinds of forming methods.Vibratory mixing technology is a mechanical strengthening technology that can significantly improve the mixing quality and agitation efficiency of building materials.It can obviously improve the internal structure of concrete and improve the strength of concrete.In order to study the difference of forming under vibration mixing and the common ways,firstly,this author analyzes the mechanism of strength formation and the mechanism of various forming methods from theoretical analysis.Then,in this paper,the author discuses study the mechanism of vibration mixing.At the same time,the author analyzes the forming mechanism of concrete strength with different forming methods under vibratory mixing and normal mixing.In this paper,the vibration compaction method of the mixture after vibration stirring is proposed,which produces a second vibration effects.Relative to common agitation,this paper analyzes the difference between the mixture under vibration and the different molding methods is small.The author designs orthogonal experiments on different forming methods,mixing ways and slumps.The author finds that the strength of specimens obtained by vibratory mixing after any molding method is obviously better than that of normal mixing by vibration molding,and the strength of concrete specimens obtained by different molding methods is not only high but also slightly different under vibratory mixing,and the strength of concrete specimens obtained by different molding methods is low and varies greatly under normal mixing.The author finds the influence of different molding methods on the strength and internal pore structure of concrete specimens under vibratory mixing and normal mixing.It is concluded that vibration mixing can improve the strength of cement concrete.The lowest increase is 16% and the highest increase is 25%.Vibration mixing optimizes the inner structure of the hole,refines the inner pores,improves hole gradation.Compared with the Shaking table molding under normal mixing,the strength of the specimen is increased by about 15% in different molding methods under vibratory mixing.Under normal mixing,the difference of concrete strength in different forming methods is about 20%.And the internal pore structure of concrete is also different.The porosity of the specimen is the lowest while the average pore size,median pore size and total pore area are the smallest under the molding of vibrator.However,the porosity of the specimen is the highest while the average pore size,median pore size and total pore area are the largest under the molding of manual insertion.Under vibratory mixing,the difference of concrete strength in different forming methods is about 6%.The internal pore structure of the concrete is significantly optimized.There are no significant differences in the porosity,average pore size,and pore size of the concrete.