By using of original apparatus utilized gravity action for mixing of cemented sand and gravel, mixing efficiency and effect of different obstacles were examined. And falling mechanism by gravity force and analysis method of particle behaviors for simulation of mixing were studied.
As the result, the mixing efficiency would be explained by the impacting momentum concerning of the products of impacting number, impacting velocity and impacting angle, and the effect for shape of the impacting obstacles, board, funnel or stick, would be able to explain by the correction factor on the formula of the impacting momentum were clarified. DEM analysis for the normalized particle distribution of sand and gravel was able to explain the falling by gravity and collision phenomenon to the obstacles by estimating parameters of the impacting energy and the frequency of the change the order of particles during falling.
