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http://dx.doi.org/10.14190/JRCR.2017.5.4.442

Proposal of A Method to Enhance Pumping Efficiency of Cementitious Materials by Injecting Activation Agent to Slip-Layer and its Lab-Scale Experimental Verification  

Lee, Jung-Soo (Department of Civil and Environmental Engineering, Myongji University)
Yoo, Yong-Sun (Chemius Korea, Kyonggi-do)
Han, Jin-Gyu (Chemius Korea, Kyonggi-do)
Park, Chan-Kyu (Samsung C&T Corporation)
Kwon, Seung-Hee (Department of Civil and Environmental Engineering, Myongji University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.5, no.4, 2017 , pp. 442-449 More about this Journal
Abstract
In this study, a method to inject small amount of activation agent from the outside of the pipeline to the inside wall of the pipe was newly proposed to enhance pumping efficiency of cementitious materials. The activation agent is injected into the slip-layer, which is generally formed in the vicinity of the inside wall of the pipe during pumping cementitous materials. Through the injections, it is expected to decrease viscosity of slip-layer, namely, the friction between the mateirals and the pipe. The proposed method was verified by lab-scale pumping tests with mortars having water to cement ratio of 47%. The tests were performed with two different type of activation agents(superplasticizer and anionic surfactant) and three different amount of the agents(0.14, 0.28, 0.42% of the mortar volume). The compressive strength were measured with and without injecting the activation agent, and the internal pressures of pipeline were measured. When the anionic surfactant was used, there was no change in the compressive strength. As the amount of anionic surfactant increased, the pumping pressure decreased up to 71.4% at the maximum.
Keywords
Pumping efficiency; Cementitious materials; Slip-layer; Activation agent for slip-layer; External injection;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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