Hydration Characteristics of Superfine Blast Furnace Slag Blended Cement Ground by Air Jet Mill

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2010 Vol.47, Issue 3 Preview Page Next Page

Hydration Characteristics of Superfine Blast Furnace Slag Blended Cement Ground by Air Jet Mill 에어 젯 밀(Air jet mill)로 분쇄된 고미분말 고로수쇄슬래그 혼합시멘트의 수화특성: 조진상, 유영환, 최문관, 조계홍, 안지환, 연규석
Jin-Sang Cho, Young-Hwan Yu, Moon-Kwan Choi, Kye-Hong Cho, Ji-Hwan Ahn and Kyu-Seok Yeon

30 June 2010. pp. 339-348

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Abstract

Blast furnace slag blended cement has some advantages of better concrete workability, lower permeability, and improved resistance to aggressive chemicals, higher compressive and flexural strength. However, blast furnace slag cement also has demerits of diminution of early strength, promotion of neutralization and increase of dry shrinkage. Two technologies for improving these demerits are able to be adopted. The first is a mixture of activators such as NaOH, Na2CO3, Ca(OH)2, CaSO4 and so on for promoting early hydration. The other is related to increase the fineness of blast furnace slag. In this study, by-product calcium hydroxide (Ca(OH)2) as an alkali activator was used, and effect of superfine blast furnace slag on the hydration properties was investigated. The results showed the early hydration was better, and the compressive strength at curing 91days was higher up to about 20% than the specimen mixed with slag 50wt.% of 8,000 cm2/g.

Keywords

Blast furnace slag

Air jet mill

Hydration

Blended cement

Superfine powder

고로수쇄슬래그 혼합시멘트는 높은 콘크리트 작업성, 불투수성, 화학적 침투저항성과 높은 압축강도 및 인장강도를 보이는 장점을 가지고 있다. 그러나, 고로수쇄슬래그 혼합시멘트는 초기강도의 저하, 중성화 촉진 그리고 높은 건조수축 등의 단점을 가지고 있다. 이러한 단점을 개선하기 위하여 NaOH, Na2CO3, Ca(OH)2, CaSO4등과 같은 활성화제를 활용 할 수 있으며, 고로수쇄슬래그 자체의 분체특성을 개선시켜 보완할 수 있다. 본 연구에서는 고로수쇄슬래그의 초기수화 단점을 보완하기 위해 에어 젯 밀을 이용하여 슬래그의 분말도를 약 16,000 cm2/g까지 증가시켰으며, 알칼리 활성화제로서 부산소석회를 사용하였다. 이렇게 분쇄된 고미분말 고로수쇄슬래그 혼합시멘트의 수화 및 물리적 특성을 조사하였다. 실험결과, 혼합시멘트의 초기수화가 개선되었으며, 압축강도가 분말도 8,000cm2/g인 고로수쇄슬래그를 혼합한 경우보다 약 20%정도 향상되었다.

키워드

고로수쇄슬래그

에어 젯 밀

수화

혼합시멘트

고미분말

References

김주상, 박규연, 김재환, 이상수, 송하영, 김을용, 2006, “고강도콘크리트의 특성에 미치는 고로슬래그 미분말의 분말도 영향에 관한 실험적연구,” 한국콘크리트학회 2006년도 가을 학술발표회 논문집, 한국콘크리트학회, 숭실대학교, 서울, 11월4일, pp. 453-456.
안지환, 조진상, 한기천, 유광석, 2004, “알칼리 자극제와 고로슬래그의 비표면적이 고로슬래그 시멘트의 압축강도에 미치는 영향,” 한국지구시스템공학회지, 제41권, 5호, pp. 395-402.
최진만, 김형래, 임정수, 김상규, 이도헌, 변승호, 윤철현, 최현국, 1999, “분말도 및 치환율 변화에 따른 고로슬래그 미분말 혼입 콘크리트의 초기물성,” 한국콘크리트학회 1999년도 가을 학술발표회 논문집, 한국콘크리트학회, pp. 297-300.
Chandra, S. and Xu, A., 1992, “Influence of presaturation and freeze-thaw resistance test conditions on length changes of Portland cement mortar,” Cement and Concrete Research, Vol. 22, No. 4, pp. 515-524.
Diamond, S., 1976, “Hydraulic cement pastes : Their structure and properties,” Cement and Concrete Association, Slough, UK.
Long, G., Wang, X. and Xie, Y., 2002, “Very high performance concrete with ultrafine powder,” Cement and Concrete Research, Vol. 32, No. 4, pp. 601-605.
Niu, Q., Feng, N., Yang, J. and Zheng, X., 2002, “Effect of superfine slag powder on cement properties,” Cement and Concrete Research, Vol. 32, No. 4, pp. 615-621.
Oner, A. and Akyuz, S., 2007, “An experimental study on optimum usage of GGBS for the compressive strength of concrete,” Cement & Concrete Composites, Vol. 29, No. 6, pp. 505-514.
Oner, M., Erdogdu, K. and Gunlu, A., 2003, “Effect of components fineness on strength of blast furnace slag cement,” Cement and Concrete Research, Vol. 33, No. 4, pp. 463-469.
Richardson, I.G. and Groves, G.W., 1992, “The microstruc ture and microanalysis of hardened cement pastes involving ground granulated blast furnace slag,” Journal of Material Science, Vol. 27, No. 22, pp. 6204-6212.
Richardson, I.G., 2000, “The nature of the hydration products in hardened cement pastes,” Cement & Concrete Composites, Vol. 22, No. 2, pp. 97-113.
Stovall, T., Larrord, F. De. and Bull, M., 1986, “Linear packing density model of grain mixture,” Powder Technology, Vol. 48, No. 1, pp. 1-12.
Zhang, X., Wu, K. and Yan, A., 2004, “Carbonation property of hardened binder pastes containing super-pulverized blast-furnace slag,” Cement & Concrete Composites, Vol. 26, No. 4, pp. 371-374.

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society for Geosystem Engineering
Journal Title(Ko) :한국지구시스템공학회지
Volume : 47
No :3
Pages :339-348

[1] 김주상, 박규연, 김재환, 이상수, 송하영, 김을용, 2006, “고강도콘크리트의 특성에 미치는 고로슬래그 미분말의 분말도 영향에 관한 실험적연구,” 한국콘크리트학회 2006년도 가을 학술발표회 논문집, 한국콘크리트학회, 숭실대학교, 서울, 11월4일, pp. 453-456.

[2] 안지환, 조진상, 한기천, 유광석, 2004, “알칼리 자극제와 고로슬래그의 비표면적이 고로슬래그 시멘트의 압축강도에 미치는 영향,” 한국지구시스템공학회지, 제41권, 5호, pp. 395-402.

[3] 최진만, 김형래, 임정수, 김상규, 이도헌, 변승호, 윤철현, 최현국, 1999, “분말도 및 치환율 변화에 따른 고로슬래그 미분말 혼입 콘크리트의 초기물성,” 한국콘크리트학회 1999년도 가을 학술발표회 논문집, 한국콘크리트학회, pp. 297-300.

[4] Chandra, S. and Xu, A., 1992, “Influence of presaturation and freeze-thaw resistance test conditions on length changes of Portland cement mortar,” Cement and Concrete Research, Vol. 22, No. 4, pp. 515-524.

[5] Diamond, S., 1976, “Hydraulic cement pastes : Their structure and properties,” Cement and Concrete Association, Slough, UK.

[6] Long, G., Wang, X. and Xie, Y., 2002, “Very high performance concrete with ultrafine powder,” Cement and Concrete Research, Vol. 32, No. 4, pp. 601-605.

[7] Niu, Q., Feng, N., Yang, J. and Zheng, X., 2002, “Effect of superfine slag powder on cement properties,” Cement and Concrete Research, Vol. 32, No. 4, pp. 615-621.

[8] Oner, A. and Akyuz, S., 2007, “An experimental study on optimum usage of GGBS for the compressive strength of concrete,” Cement & Concrete Composites, Vol. 29, No. 6, pp. 505-514.

[9] Oner, M., Erdogdu, K. and Gunlu, A., 2003, “Effect of components fineness on strength of blast furnace slag cement,” Cement and Concrete Research, Vol. 33, No. 4, pp. 463-469.

[10] Richardson, I.G. and Groves, G.W., 1992, “The microstruc ture and microanalysis of hardened cement pastes involving ground granulated blast furnace slag,” Journal of Material Science, Vol. 27, No. 22, pp. 6204-6212.

[11] Richardson, I.G., 2000, “The nature of the hydration products in hardened cement pastes,” Cement & Concrete Composites, Vol. 22, No. 2, pp. 97-113.

[12] Stovall, T., Larrord, F. De. and Bull, M., 1986, “Linear packing density model of grain mixture,” Powder Technology, Vol. 48, No. 1, pp. 1-12.

[13] Zhang, X., Wu, K. and Yan, A., 2004, “Carbonation property of hardened binder pastes containing super-pulverized blast-furnace slag,” Cement & Concrete Composites, Vol. 26, No. 4, pp. 371-374.

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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