Performance Study of High-Performance Synthetic Supporting Materials by Real-Scale Tests

Tae-Ho Kang; Soo-Ho Chang; Soon-Wook Choi; Chulho Lee

doi:10.7474/TUS.2021.31.6.428

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2021 Vol.31, Issue 6 Preview Page Next Page

Technical Note

Performance Study of High-Performance Synthetic Supporting Materials by Real-Scale Tests 실대형 시험을 통한 고성능 합성지보재의 성능 고찰

31 December 2021. pp. 428-439

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Abstract

A spray-on membrane is a material composed of a polymer, and is a spray-type material that is expected to be able to replace materials such as existing shotcrete or sheet membrane for support or waterproofing purposes. In the previous studies, it is expected that the thickness of the support material such as shotcrete can be reduced if the spray-on membrane is additionally installed on the existing cement-based support materials. In this study, a three-point bending test was performed by a spray-on membrane on the high-performance shotcrete on the outside, and comparison was made between the case where high-performance shotcrete and a spray-on membrane were installed. As a result of comparing the values calculated through the standard test and the real-size bending test, there was no significant difference in terms of flexural strength, but it was found that there was a difference in flexural toughness.

Keywords

Spray-on membrane

Real-scale test

Polymer

Waterproof

Support

뿜칠 멤브레인은 폴리머로 구성된 재료로서 지보 또는 차수 목적으로 기존 방수포와 같은 재료를 대체할 수 있을 것으로 기대되는 뿜어 붙이는 방식의 재료이다. 이전의 해외 연구에서 기존 시멘트계 지보 재료들에 추가로 뿜칠 멤브레인을 시공할 경우 숏크리트와 같은 지보재의 시공 두께를 줄일 수 있을 것으로 기대하고 있으나 국내에서는 아직까지 실험이나 분석 결과가 많이 보고되고 있지 못하다. 본 연구에서는 고성능 숏크리트에 뿜칠 멤브레인을 바깥면에 타설하여 3점 휨시험을 수행하고 고성능 숏크리트와 뿜칠 멤브레인이 시공된 경우를 비교하여 분석하였다. 실내 표준 시험과 실대형 휨시험을 통해 산정된 값을 서로 비교한 결과 휨강도 측면에서는 큰 차이를 보이지 않았으나 휨인성 부분에서 차이를 보이는 것으로 나타났다.

키워드

뿜어 붙임 멤브레인

실대형 시험

폴리머

차수재

지보재

References

Ahn, T., 2011, "Thermal and mechanical studies of TSL for concrete tunnel", Ph.D. Thesis, Electronic Thesis and Dissertation Repository, Paper 301, University of Western Ontario.

ASTM, 2010, Standard Test Method for Tensile Properties of Plastics, D638-10.

Choi, S-W., Kang, T-H., Chang, S-H., Lee, C., Kim, J. and Choi, M-S., 2017, "A preliminary study of watertightness and salt water resistance of spray-applied membrane", J of Korean Tunn undergr Sp Assoc, Vol. 19, Issue 2, pp. 283-299. 10.9711/KTAJ.2017.19.2.283

Chang, S-H., Kang, T-H., Choi, S-W., Lee, C., Hwang, G-S. and Choi, M-S. 2016, "An Experimental Study on Fundamental Properties of a Sprayable Waterproofing Membrane", J of Korean Tunn undergr Sp Assoc, Vol. 26, Issue 3, pp. 220-234 10.7474/TUS.2016.26.3.220

Han, J.-T., Lee, G.-P., Park, Y.-T., Choi, S.-W., Hwang, G.-S., Choi, M.-S. and Chang, S.-H., 2013, An experimental study on bonding and bearing capacities of thin spray-on liner to evaluate its applicability as a tunnel support member, J. of Korean Tunn Undergr Sp Assoc,Vol. 15, No. 6, 571-583. 10.9711/KTAJ.2013.15.6.571

EFNARC, 2008, Specification and Guidelines on Thin Spray-on Liners for Mining and Tunnelling.

ITAtech, 2013, "ITAtech design guidance for spray applied waterproofing membranes", ITAtech Activity Group Lining and Waterproofing, ITAtech Report No. 2.

Holter, K.G., 2016, "Performance of EVA-Based membranes for SCL in hard rock", Rock Mech. Rock Eng., Vol. 49, 1329-1358. 10.1007/s00603-015-0844-5

Lee, G.-P., Bae, G.-J., Moon, D.-Y., Kang, T.-S. and Chang, S.-H., 2013, Evaluation of steel fiber reinforcement effect in segment lining by full scale bending test, Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 3,215-223. 10.9711/KTAJ.2013.15.3.215

Lee, C., Lee, K.., Kim, D., Choi. S-W., Kang, T-H. and Chang, S-H., 2017, "Numerical study on structural reinforced effects of concrete lining by spray-applied waterproofing membrane", J of Korean Tunn undergr Sp Assoc, Vol. 19, Issue 3, pp. 551-565. 10.9711/KTAJ.2017.19.3.551

Makhlouf, R. and K. Holter, 2008, Rehabilitation of concrete lined tunnels using a composite sprayed liner with sprayed concrete and sprayable waterproofing mem brane, Proc. of ITA World Tunnel Congress 2008, Agra, India, 1175-1182

Tannant, D.D., 2001, Thin Spray-on Liners for Underground Rock Support, Proceedings of the 17th International Mining Congress and Exhibition of Turkey - IMCET 2001, 57-73.

Thomas, A., 2009, Sprayed Concrete Lined Tunnels, Taylor & Francis, London. 10.1201/9781482265682

Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 31
No :6
Pages :428-439
Received Date : 2021-12-02
Revised Date : 2021-12-14
Accepted Date : 2021-12-14
DOI :https://doi.org/10.7474/TUS.2021.31.6.428

Tunnel and Underground Space ISSN:1225-1275(Print) 2287-1748(Online) 터널과 지하공간

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