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A Study on Rheology Properties of High Performance Wet-mix Shotcrete  

Choi, Sung-Yong (강원대학교 토목공학과)
Yun, Kyong-Ku (강원대학교 토목공학과)
Kim, Jin-Woung (한국도로공사)
Kim, Yong-Bin (부양산업(주))
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.10, no.4, 2010 , pp. 25-32 More about this Journal
Abstract
High performance shotcrete has been recently researched partly as a result of high consensus on high strength and durability. However, they are very initial step compared from the advanced countries. For instance, they has been mainly on high strength or durability without any consideration on pumpability and shootability which are very crucial on workability. The purpose of this dissertation was to make a high performance wet-mix shotcrete (high workability) which would solve the general problems of wet-mix process in Korea. For this, the main experimental variables were selected to be silica fume(0.0, 4.5, 9%), air entrained agent(0.0, 0.005%). Rheology with IBB rheometer was measured for evaluating pumpability and shootability as well as pump pressure, rebound rate and build-up thickness. The conclusions from a series of experiments were as follow: The results of analyzing the effects of AE agent and silica fume on rheology indicated that AE agent reduced both of flow resistance(G) and torque viscosity(H) and silica fume increased flow resistance (G) and reduced torque viscosity(H). An increase in the value of torque viscosity(H) produces an increase in the requried pumping pressure. These result indicated that the reduction of torque would work better at improving pumpability. And an increase flow resistance(G) improved shootability(increase build-up thickness and reduce rebound).
Keywords
shotcrete; rheology; pumpability; shootability; flow resistance; torque viscosity;
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