터널 지보용 숏크리트의 유해이온에 대한 열화특성
Deterioration Properties of Shotcrete as Tunnel Supporter was Exposed to Harmful Ions
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Shotcrete have become a deterioration which was exposed to harmful environments. In this study, in order to evaluate the deterioration properties of shotcrete, visual examination, compressive strength, adhesive strength, microstructural analysis were investigated up to the 60th weeks of exposure. The attack solutions for test are sodium sulfate and hydrochloric acid solution with different concentrations, respectively. From the results, although the compressive strength of shotcrete specimens and the adhesive strength between specimens and rocks were high at the early immersion age, they rapidly dropped in the subsequent phases, especially in 5% sodium sulfate and pH1 hydrochloric acid solution. With continued exposure, various harmful ions penetrated into the shotcrete specimen, reacted with the cement hydrate, and generated expansion substances. It was verified that the shotcrete specimens suffered a serious deterioration by chemical attack.
Abstract
Shotcrete have become a deterioration which was exposed to harmful environments. In this study, in order to evaluate the deterioration properties of shotcrete, visual examination, compressive strength, adhesive strength, microstructural analysis were investigated up to the 60th weeks of exposure. The attack solutions for test are sodium sulfate and hydrochloric acid solution with different concentrations, respectively. From the results, although the compressive strength of shotcrete specimens and the adhesive strength between specimens and rocks were high at the early immersion age, they rapidly dropped in the subsequent phases, especially in 5% sodium sulfate and pH1 hydrochloric acid solution. With continued exposure, various harmful ions penetrated into the shotcrete specimen, reacted with the cement hydrate, and generated expansion substances. It was verified that the shotcrete specimens suffered a serious deterioration by chemical attack.
참고문헌 (16)
- 김성수, "터널지보재의 열화특성 연구" (2004), 한국건설기술 연구원
- 문한영, "화학약품용액에 침지한 콘크리트의 열화에 대한 연구", 대한토목학회 논문집, 12(2), pp.55~66 (1992)
- 정호섭, "터널구조물의 누수 및 백화 현상에 대한 현장조사", 한국지반공학회 2007가을학술발표회, pp.1160~1163 (2007)
- IT 및 신소재를 활용한 급속안 정화 터널 시공기술 개발, "한국건설기술연구원", 한국건설기술연구원, ~, pp.첨단도시개발 사업 보고서 (2007)
- 이규필, "화학적 침식에 의한 숏크리트의 열화거동 분석-단기거동", 터널기술, 7(2), pp.143~152 (2005), 한국터널공학회
- "ACI Manual of Concrete Practice. 201.2 Guide to Durable Concrete", ~ (1997)
- Al-Amoudi, O.S.B., "Studies on Soil-Foundation Interaction in the Sabkha Environment of Eastern Province of Saudi Arabia", 석사, pp.1992
- Brown, P.W, "The role of ettringite in external sulfate attack ; In Materials Science of Concrete Special Volume : Sulfate Attack Mechanism", pp.73~98 (1999), The American Ceramic Society
- Crammond, N.J., "The thaumasite form of sulfate attack in the UK", Cement and Concrete Composites, 25, pp.809~818 (2003)
- Hartshorn, S.A., "Thaumasite Formation in Portland- Limestone Cement Pastes", Cement and Concrete Research, 29, pp.1331~1340 (1999)
- Jung, H.S., "Influence of fineness of limestone powder on external sulfate attack", Proceedings of ANDE 2007, pp.177~ (2007)
- Lea, F. M., "The chemistry of cement and concrete" (1998), Arnold
- Lee, S.T., "Effect of limestone filler on the deterioration of mortars and pastes exposed to sulfate solutions at ambient temperature", Cement and Concrete Research, 38(1), pp.68~76 (2008)
- Mehta P.K., "Mechanism of Sulfate Attack on Portland Cement-Another Look", Cement and Concrete Research, 13, pp.401~406 (1983)
- Moon, H.Y., "Sulphate Resistance of Silica Fume Blended Mortars Exposed to Various Sulphate Solutions", CJCE, 30(4), pp.625~636 (2003)
- 문한영, "Sulfate Re sistance of Cement Matrix Containing Limestone Powder", 콘크리트학회 논문집, 16(3), pp.433~440 (2004), 한국콘크리트학회