• Title/Summary/Keyword: 숏크리트

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Development of High Performance Shotcrete for Permanent Shotcrete Tunnel Lining(I : Application of New Type Accelerator for High Strength Shotcrete) (Permanent Shotcrete Tunnel Lining 구축을 위한 고성능 숏크리트 개발( I : 고강도 숏크리트 개발을 위한 새로운 급결제 적용))

  • 박해균;이명섭;김재권;안병제
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.1023-1030
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    • 2002

  • From the early 1980s, the New Austrian Tunnelling Method (NATM) has been developed as a one of the standard tunneling method in Korea. Approximately 10 years ago, wet-mix shotcrete with sodium silicate accelerator (waterglass) was introduced and widely used to tunnel lining and underground support. However, this accelerator had some disadvantages due to the decrease of long-term strength compared to plain concrete (without accelerator) and low quality of the hardened shotcrete. In order to compensate for these disadvantages, recently developed alkali-free accelerator has been successfully demonstrated in numerous projects and applications as a new material to make tunnels more durable and safer. An experimental investigation was carried out in order to verify the strength behavior of wet-mix Steel Fiber Reinforced Shotcrete (SFRS) with alkali-free accelerator. Compressive strength, flexural strength and equivalent flexural strength were measured by testing specimens extracted from the shotcrete panels. From the results, wet-mix SFRS with alkali-free accelerator exhibited excellent strength improvement compared to the conventional shotcrete accelerator.

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