Abstract
This paper deals with the laboratory and field tests to evaluate the pumpability of vermiculite gypsum plaster. The plaster is consisted of South African vermiculite, byproduct gypsum and asbestos throughout tests. Testing items are as follows; a) The laboratory test on flow properties of plaster. b) The pumping test with holizontal 53m pipe. c) The vertical pumping test at a 167m building under construction in Tokyo. The conclusion are as follows; a) It was observed that the flow value by flow-table test was related to the plastic viscosity and yield value obtained by rotary rheometer. b) The flow property of vermiculite gypsum plaster in pipeline could be definited by the relation of flow resistance R and flow value by flow-table test. R=P/L/v P; pressure loss L; length of pipeline v; average velosity c) The holizontal or vertical pumpable length can be caluculated by appling the above equation on flow value.
