Nowadays, antiwashout underwater concrete is widely used for constructing underwater concrete structures but they, especially placed in marine environment, can be easily attacked by chemical ions such as SO$^<$TEX>2-/$\_$4/ Cl$^<$TEX>-/ and Mg$^<$TEX>2＋/, so the quality and capability of concrete structures go down. In this paper, to solve and improve those matters, flyash and GGBFS(ground granulated blast furnace slag) were used as partial replacements for ordinary portland cement. As results of experiments for fundamental properties of antiwashout underwater concrete containing 10, 20, 30％ of flyash and 40, 50, 60 ％ of GGBFS respectively, setting time, air contents, suspended solids and pH value were satisfied with the "Standard Specification of Antiwashout Admixtures for Concrete" prescribed by KSCE, and also slump flow, efflux time and elevation of head were more improved than that of control concrete. From the compressive strength test, it was revealed that the antiwashout underwater concrete containing mineral admixtures(flyash and GGBFS) is more effective for long term compressive strength than control concrete. An attempt to know how durable when they are under chemical attack has also been done by immersing in chemical solutions that were x2 artificial seawater, 5 ％ sulphuric acid solution, 10％, sodium sulfate solution and 10％ calcium chloride solution. After immersion test for 91days, XRD analysis was carried out to investigate the reactants between cement hydrates and chemical ions and some crystalline such as gypsum ettringite and Fridel′s salt were confirmed.
Freeman, R. B. and Carrasquillo, R. L., "Product of Sulfate-Resistance Containing High Calcium Fly Ash and Sodium Sulfate Admixture," Fly ash, Silica Fume, Slag and Natural Pozzolans in Concrete, ACI SP-91, Vol. 2, 1986, pp.153-167.
Longo, A. and Torrent, R. J., "Method of Addition of Blast-Furnace Slag; Their Effect on the Compressive Strength of Mortar and Concrete," Fly ash, Silica Fume, Slag and Natural Pozzolans in Concrete, ACI SP-91, Vol. 2, 1986, pp. 1381-1399.
이 논문을 인용한 문헌 (3)
Moon HanYoung ; Shin Kook-Jae ; Song Yong-Kyu 2005. "Freezing and Thawing Resistance and fundamental Properties of Antiwashout Underwater Concrete Containing Mineral Admixtures" 콘크리트학회논문집 = Journal of the Korea Concrete Institute, 17(3): 455~464
Kim, Nam-Wook 2008. "A Study on the Evaluation of Durability of Fiber Reinforced Concrete According to the Change of External Conditions" 한국안전학회지 = Journal of the Korean Society of Safety, 23(5): 97~104
Park, Yong Kyu ; Kim, Hyun Woo ; Yoon, Ki Woon 2014. "Quality Evaluation and Mix Proportion of Antiwashout Underwater Concrete with Mineral Admixture" 콘크리트학회논문집 = Journal of the Korea Concrete Institute, 26(6): 679~686