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Title |
Durability Characteristics of High Performance Shotcrete for Permanent Support of Large Size Underground Space
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Keywords |
알칼리 프리계 급결제 ; 시멘트 광물계 급결제 ; 내구성 ; 영구지보재 ; 숏크리트 ; alkali-free accelerator ; cement mineral accelerator ; durability ; permanent support ; shotcrete |
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Abstract |
This study evaluated the durability of high-performance shotcrete mixed in the proper proportions using alkali-free and cement mineral accelerators as a permanent support that maintains its strength for the long term. Durability tests were performed the chloride permeability, repeated freezing and thawing, accelerated carbonation, and the effects of salt environments. Test results showed that all the shotcrete mixes included silica fume had low permeability. In addition, after 300 freeze/thaw cycles, the shotcrete mix had excellent freeze/thaw resistance more than the 85% relative dynamic modulus of elasticity. The accelerated carbonation test results were no effect of accelerator type but, the depth of carbonation was greater in the shotcrete mix containing silica fume. No damage was seen in a salt environments. Therefore, the high performance shotcrete mix proportions used in this study showed excellent durability.
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