2001 Volume 8 Issue 290 Pages 26-32
Operating conditions, extruding pressure and extruding velocity, under extrusion moulding of cementitious materials produced by extrusion moulding are very important factor to control actual production facilities. A comprehensive predictive method for extruding pressure has been proposed on author's previous studies. However a predictive method for extruding velocity has not been clarified. Adjusting ratio, namely materials efficiency constants, of which conveying rate per revolution are adjusted by water content ratio are very important items for predicting extruding velocity. Because its items are correspond with productive efficiency. In this paper materials efficiency constants are confirmed to various experimental data under the various materials and mix proportions, such as sand cement ratio, the maximum size of fine aggregate, kinds of fiber additives and water content ratio. As results, the constants are clarified to be depended on materials and mix proportions as shown in the followings;
1) A relationship between the constants and sand cement ratio is a linear proportion.
2) The effects of aggregate size are small.
3) The effects of fiber kinds are different from each other.