抄録
The mechanisms of segregation in mixtures under action of vibration have not been completely understood in the field of concrete technology.
In the present study, the phenomenon of segregation in a mixture of ideal simple system consisting of the bed of fine particles and a single large sphere particle was investigated experimentally, and the degree of segregation defined by the segregation time was evaluated by the motion of a single large particle through a dry fine particle bed.
The frequency of vibration was selected to be 50 to 150Hz with the acceleration ranging from 2 to 15g, and the effect of acceleration at a constant frequency of vibration on the segregation time was measured.
The effects of the size, shape and density of the large particle, the particle size and the grading of fine granular were also studied.
The results obtained provided useful informations to define the fundamental mechanism of segregation in fresh concrete.
