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Setting Time and Strength Characteristics of Cement Mixtures with Set Accelerating Agent for Shotcrete
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 Title & Authors
Setting Time and Strength Characteristics of Cement Mixtures with Set Accelerating Agent for Shotcrete
Kim Jin-Cheol; Ryu Jong-Hyun;
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 Abstract
Although set accelerating agents are used generally in New Austrian Tunneling Method, the standards for test methods and quality of set accelerating agents are not prescribed domestically. In this study, the proprieties of the various standards and the characteristics of set accelerating agents for shotcrete were evaluated. The alkali contents of set accelerating agents based on silicate, aluminate and cement were higher than those of alkali-free ones. From the result, it is thought that the quality control of aggregate should be enhanced and that the number of test cycle of alkali-aggregate reaction should be increased. The setting times of cement paste with set accelerating agents based on silicate and alkali-free ones were different largely with mixing methods. Compressive strength of mortar with set accelerating agents based on silicate, aluminate and cement at one day satisfied the specifications of Korea Concrete Institute. However, the strength ratio compared to control mix at 28 days showed as except for the alkali-free set accelerating agents. As a results of setting time and strength test, the establishment of domestic standards that can reflect the characteristics of materials and construction methods of tunnels and that can increase quality of set accelerating agents is required immediately.
 Keywords
set accelerating agents;alkali contents;silicate;aluminate;alkali-free;setting time;strength ratio;
 Language
Korean
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