A STUDY ON THE DISPERSION/FLOCCULATION STATE AND FRICTION OF CEMENT PARTICLES IN MORTAR BASED ON THE RULES OF FLUIDITY AND AMOUNT OF WATER BLED BY CENTRIFUGAL FORCE

Abstract

The authors defined the percentage of the amount of water in mortar bled by centrifugal force divided by powder volume as “WcsP” and could succeed to definitely derive the new index of free water for fluidity as “WfP”. Then, by using the index “WfP” that also indicates the space between particles, the categories of flocculation states of the particles and frictions among them were investigated based on the relationships between “WfP” and conditions on mix proportion, such as SP/C or Vw/Vp, and between “WfP” and viscosity of mortar. This study clarified the followings: (1) The flocculation states are classified into three categolies, such as the strong flocculation region, transient one and dispersed one according the dosage of superplasticizer(SP). (2) Flocs have two types of friction; one is “friction between the surfaces of flocs”, which influences on the deformability of mortar, and the other is “friction inside of a floc”, which influences on the viscosity of mortar.