황산처리 굴패각을 이용한 유동성 뒷채움용 고화재 개발

왕설; 김성배; 김창준; Xue Wang; Sung Bae Kim; Chang-Joon Kim

Clean Technology, Vol.24, No.4, 315-322, December, 2018

DOI10.7464/ksct.2018.24.4.315 Export Citation

황산처리 굴패각을 이용한 유동성 뒷채움용 고화재 개발

Development of Sulfated Oyster Shell-Based Solidifying Agent for Flowable Backfill Material

왕설, 김성배, 김창준^†

경상대학교 화학공학과 및 공학연구원, 52828 경남 진주시 진주대로 501

Xue Wang, Sung Bae Kim, and Chang-Joon Kim^†

Department of Chemical Engineering and ERI, 501 Jinju-daero, Jinju-si, Gyeonnam 52828, Korea

E-mail:

초록

탄산칼슘(CaCO3) 형태의 천연 굴패각을 포졸란 반응 물질인 생석회(CaO)로 전환하기 위해서는 고온(> 800 ℃)의 소성 공정이 필요하다. 이로 인한 과도한 에너지 비용 투입이 굴패각의 산업적 이용에 큰 걸림돌로 작용하였다. 본 연구의 목적은 소성과정 없이 굴패각을 뒷채움용 고화재 소재로 개발하는 것이다. 본 연구팀은 굴패각을 황산칼슘 형태로 전환하고, 이를 수산화나트륨 및 황토와 혼합하여 고화물을 생성시키는 방법을 제안하였다. 굴패각을 황산칼슘으로 전환시키기 위한 황산용액과 황산칼슘을 소석회(Ca(OH)2)로 전환하는 데 필요한 수산화나트륨 용액의 최적 농도를 결정하였다. 신규 고화재, 천연굴패각, 석탄회 비율을 변화시켜 뒷채움재를 제조하고 양생한 후 공시체의 일축압축강도를 비교하였다. 고화재 함량 비율이 증가할수록 공시체의 일축압축강도는 증가한 반면 동일한 고화재 함량에서 석탄회 대비 천연 굴패각 함량이 증가할수록 공시체의 일축압축강도가 증가하였다. 본 결과는 천연 굴패각과 석탄회를 이용한 뒷채움재 제조에 있어서 황산처리 굴패 각, 황토, 수산화나트륨 용액으로 구성된 고화재가 효과적으로 사용될 수 있음을 보여준다. 황산처리 굴패각 기반 고화재는 기존에 개발된 바 없고, 굴패각을 활용한 경제성 있는 뒷채움용 소재 개발과 굴패각의 산업적 활용도를 높이는데 커다란 기여를 할 것이다.

Industrial use of waste oyster shells is limited because of requiring excessive energy for converting natural oyster shells in the form of calcium carbonate (CaCO3) into calcium oxide (CaO) for this purpose. This study aimed to develop energy-saving process for producing solidifying agent using waste oyster shells for backfill materials. It was suggested that oyster shells were converted to calcium sulfates which were mixed with sodium hydroxide solution and red clay, forming solid specimen. The optimal concentrations of sulfuric acid for sulfation of oyster shell and sodium hydroxide to generate calcium hydroxide (Ca(OH)2), were determined. Unconfined compressive strength of solid specimen increased with increasing the content of solidifying agent while it increased also with increasing ratio of natural oyster shells to coal ash. The result clearly demonstrates that solidifying agent consisting of sulfuric acid-treated oyster shell, coal ash, and sodium hydroxide solution, can be effectively utilized for preparing backfill materials using natural oyster shell and coal ash. Sulfuric acid-treated oyster shell-based solidifying agent has not been previously developed and will contribute to broaden industrial application of waste oyster shells.

Keywords:Sulfuric acid-treated oyster shell;Red clay;Solidifying agent;Coal ash;Flowable backfill material

[References]

Cheon S, Jeong S, Lee D, Kim D, J. Korean Soc. Civil Eng., 26(5C), 303 (2006)
Kim SS, Park YD, Chung SY, Han SJ, “Making method of fluid soil,” Korean Patent No. 10-0805676 (2008).
Ryu YS, Hang JG, Chase WR, Koo JS, Lee DY, J. Geosynth. Soc., 14(3), 13 (2015)
Lee KH, J. Korean Academia-Industrial, 18(5), 16 (2017)
Lee GS, Cho GH, Kim DY, Hwang GH, “Strategies for Eco-friendly Utilization and Industrialization of Fishery By-products,” Korea Maritime Institute (2013).
Kong JY, Jung HS, Cho SD, Kim JH, Hyun JH, Chun BS, J. Korean Geotechnol. Soc., 28(12), 27 (2012)
Kuo WT, Wang HY, Shu CY, Su DS, Constr. Build. Mater., 46, 128 (2013)
Liang CF, Wang HY, “Feasibility of Pulverized Oyster Shell as a Cementing Material,” Adv. Mater. Sci. Eng., 2013, Article ID 8092473 (2013).
Kim MJ, Wang X, Lee JJ, Lee SH, Kim SB, Kim CJ, Clean Technol., 19(4), 423 (2013)
Yoon H, Park S, Lee K, Park J, Waste Manage Res., 22, 158 (2004)
Do TM, Kim YS, Dang MQ, J. Civ. Eng., 21, 1774 (2017)
Oh SH, Hwang MH, Shon BH, Int. J. Emerging Technol. Adv. Eng., 7(2), 55 (62)
Abdullah A, Jaafar MS, Taufiq-Yap YH, Alhozaimy A, Al-Negheimish A, Noorzaei J, Sci. Res. Essays., 7(7), 719 (2012)
Peng XY, Wang YY, Chai LY, Shu YD, Trans. Nonferrous Met. Soc. China, 19, 249 (2009)
Lopez-Delgado A, Lopez-Andres S, Padilla I, Alvarez M, Galindo R, Vazquez AJ, Geomaterials, 4, 82 (2014)
Kim KD, J. Korean. Soc. Environ. Anal., 12, 1 (2009)
Heisig A, Urbonas L, Beddoe RE, Heinz D, Mater. Struct., 49, 4291 (2016)

[1] Cheon S, Jeong S, Lee D, Kim D, J. Korean Soc. Civil Eng., 26(5C), 303 (2006)

[2] Kim SS, Park YD, Chung SY, Han SJ, “Making method of fluid soil,” Korean Patent No. 10-0805676 (2008).

[3] Ryu YS, Hang JG, Chase WR, Koo JS, Lee DY, J. Geosynth. Soc., 14(3), 13 (2015)

[4] Lee KH, J. Korean Academia-Industrial, 18(5), 16 (2017)

[5] Lee GS, Cho GH, Kim DY, Hwang GH, “Strategies for Eco-friendly Utilization and Industrialization of Fishery By-products,” Korea Maritime Institute (2013).

[6] Kong JY, Jung HS, Cho SD, Kim JH, Hyun JH, Chun BS, J. Korean Geotechnol. Soc., 28(12), 27 (2012)

[7] Kuo WT, Wang HY, Shu CY, Su DS, Constr. Build. Mater., 46, 128 (2013)

[8] Liang CF, Wang HY, “Feasibility of Pulverized Oyster Shell as a Cementing Material,” Adv. Mater. Sci. Eng., 2013, Article ID 8092473 (2013).

[9] Kim MJ, Wang X, Lee JJ, Lee SH, Kim SB, Kim CJ, Clean Technol., 19(4), 423 (2013)

[10] Yoon H, Park S, Lee K, Park J, Waste Manage Res., 22, 158 (2004)

[11] Do TM, Kim YS, Dang MQ, J. Civ. Eng., 21, 1774 (2017)

[12] Oh SH, Hwang MH, Shon BH, Int. J. Emerging Technol. Adv. Eng., 7(2), 55 (62)

[13] Abdullah A, Jaafar MS, Taufiq-Yap YH, Alhozaimy A, Al-Negheimish A, Noorzaei J, Sci. Res. Essays., 7(7), 719 (2012)

[14] Peng XY, Wang YY, Chai LY, Shu YD, Trans. Nonferrous Met. Soc. China, 19, 249 (2009)

[15] Lopez-Delgado A, Lopez-Andres S, Padilla I, Alvarez M, Galindo R, Vazquez AJ, Geomaterials, 4, 82 (2014)

[16] Kim KD, J. Korean. Soc. Environ. Anal., 12, 1 (2009)

[17] Heisig A, Urbonas L, Beddoe RE, Heinz D, Mater. Struct., 49, 4291 (2016)