Development of high performance shotcrete for permanent shotcrete tunnel linings (Application of high-early strength cement with alkali-free  accelerator in spring water condition)

Hae Geun Park; Myeong Sub Lee; Jea Kwon Kim

doi:None

All Issue

2003 Vol.5, Issue 1 Preview Page Next Page

Development of high performance shotcrete for permanent shotcrete tunnel linings (Application of high-early strength cement with alkali-free accelerator in spring water condition) 영구 숏크리트 터널 라이닝 구축을 위한 고성능 숏크리트 개발 (용수부에서의 조강시멘트와 alkali-free급결제 적용 검토)

31 March 2003. pp. 23-31

PDF XML

Abstract

Since the mid of 1990, permanent shotcrete tunnel linings such as Single-shell and NMT have been constructed in many countries for reducing the construction time and lowing construction costs instead of conventional in-situ concrete linings. Among essential technologies for successful application of permanent shotcrete linings, high performance shotcrete having high strength, high durability and better pumpability has to be developed in advance as an integral component. This paper presents the idea and first experimental attempts to increase early strength and bond strength of wet-mixed Steel Fiber Reinforced Shotcrete (SFRS) in spring water condition. In order to increase early behavior of SFRS, a new approach using high-early strength cement with alkali-free liquid accelerator has been investigated. From the test results, wet-mix SFRS with high-early strength cement and alkali-free accelerator exhibited excellent early compressive strength improvement compared to the ordinary portland cement and good bond strength even under spring water condition.

Keywords

High performance shotcrete

permanent shotcrete linings

high-early strength cement

alkali-free accelerator

spring water

최근 NATM 터널 현장타설 콘크리트 라이닝의 시공성 향상과 균열에 따른 유지관리비 절감을 위해 양질 암반의 배수형 터널 시공에 있어서는 숏크리트만으로 라이닝을 대체하려는 영구지보 개념의 터널시공 (Single-Shell Tunnel, NMT 등)이 세계적으로 증가하고 있는 추세이다. 이러한 영구지보 개념의 터널 시공을 위해서는 고성능 숏크리트의 개발이 선결되어야 하며, 이러한 목적에서 본 논문에서는 조강시멘트와 최근 주목받고 있는 환경친화적인 alkali-free 급결제의 조합을 통해 고성능 숏크리트의 개발 가능성을 확인하였다. 그 결과, 보통시멘트(OPC)를 사용한 숏크리트보다 약 25%의 높은 초기강도를 확보하였으며, 용수부에서도 뛰어난 부착특성을 확인할 수 있었다.

키워드

고성능 숏크리트

영구 숏크리트 라이닝

조강시멘트

알칼리-프리 급결제

용수부

References

1. 건설교통부 (1999), 터널표준시방서, (사)대한터널협회.

2. 건설교통부 (1999), 터널설계기준, (사)대한터널협회.

3. 건설교통부 (1996), 콘크리트표준시방서.

4. ACI (1995), Reported by ACI Committee 506 Sp-ecification for Shotcrete.

5. EFNARC (1996), European Specification for Sprayed Concrete Guidelines for Specifiers and Sontractors.

6. Loschnig, P. (1995), Environmentally Compatible Spray Cement, Shotcretre for Underground Support pp.276-280.

7. Lukas, W., Kusterle, W., and Pichler, W. (1995), Innovations in Shotcrete Technology, Shotcretre for Underground Support 7, pp.155-164.

8. 松下敏郞 (1992), “高熱帶と高水壓低速度帶を克服した安房トンネル”, トンネルと地下, Vol.23, No.3

9. 森下 (2001), “新しい吹付けコンクリ－ト急結劑の適用と評價”,トンネルと地下, Vol.32, No.4.

10. 中島ほか(2000), “セメントの種類が吹付けコンクリ－トの品質に及ぼす影響”, コンクリ－ト工學年次論文報告書, Vol.22, No.2, pp.1-6.

11. (社)日本トンネル技術協會(1996), トンネルの吹付けコンクリ－ト.

12. 박해균, 이명섭, 김재권, 정명근 (2002), “고품질 숏크리트 개발을 위한 새로운 급결제 적용”, 한국터널공학회 논문집, Vol.4, No.1, pp.45-55.

Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 5
No :1
Pages :23-31

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

All Issue