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Title |
Setting Time, Strength and Rebound Rate of Shotcrete according to Accelerators
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Keywords |
숏크리트; 압축강도; 휨강도; 리바운드율; 시멘트광물계 급결제; shotcrete; compressive strength; flexural strength; rebound rate; cement mineral accelerator |
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Abstract |
An experimental investigation was carried out in order to verify the compressive strength, flexural strength, equivalent bending strength, rebound rate of shotcrete according to silicate accelerator, aluminate accelerator, cement mineral accelerator respectively and to especially evaluate the performance of shotcrete using cement mineral accelerator for high quality. The test result of compressive strength was showed that all accelerators were satisfied the required test value for each age, for the requirement of having the 75% or higher compressive strength ratio to plain concretes at 28 days, cement mineral accelerator with 87% compressive strength ratio was only satisfied. In flexural strength test, cement mineral accelerator was satisfied the flexural strength requirement in steel fiber reinforced shotcrete for each age. Aluminate type was conformed to the requirement for 28 days, but not at 1 day, silicate type was failed to satisfy standard requirement. Rebound rate was measured between 11~19% and cement mineral accelerator was showed comparatively lower rebound rate. Based on the test results, cement mineral accelerator exhibited excellent strength improvement and lower rebound rate compared to the conventional accelerator, its result is showed the possibility of making high performance shotcrete.
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