DOI QR코드

DOI QR Code

Effect of Various Superplasticizers on the Hydration of Cement Paste

시멘트페이스트 수화 반응에 미치는 고유동화제의 영향성에 관한 연구

  • Published : 2005.12.01

Abstract

To research effects of various chemical superplasticizers(Lignosulfonic acid, Naphthalene sulfonated formaldehyde condensate, melamine sulfonated formaldehyde condensate, and Polycarboxylate) on the hydration of cement, experiments involving XRD, SEM, and DSC have been analysed with cement paste specimens. Regardless of types and dosages of superplasticizers, hydration reaction of specimen applied superplasticizer was delayed to 3 day, but then it showed similarity to plain which don't add superplasticizer. Moreover, the hydrating rate of cement paste was retarded as dosage of superplasticizer was increased. Also, kinetics related with hydrate of cement paste was slow in order of lignosulfonic acid, polycarboxylate, melamine and naphthalene sulfonated formaldehyde condensate. Nevertheless, when all kinds of chemical admixtures were used, morphologies of these hydrates were denser and more uniform than those of plain.

4종의 콘크리트용 화학 혼화제(리그노 술폰산, 나프탈렌 술폰산 축합물, 멜라민 술폰산 축합물, 폴리카복실레이트계)가 시멘트 수화 반응에 미치는 영향성을 평가하고자, 각각의 고유동화제들이 적용된 시멘트페이스트 경화 시편을 활용해 X-선 회절분석(XRD), 주사전자현미경(SEM), 그리고 열분석(DSC) 분석을 실시하였다. 고유동화제를 사용하지 않은 plain과 비교해 고유동화제를 첨가한 시편의 경우, 고유동화제의 종류 및 사용량에 관계없이 3일까지 수화 반응은 지연되었으나, 이후 재령에서는 고유동화제를 사용하지 않은 plain과 유사한 경향성을 보였다. 특히 고유동화제 사용량이 높아질 경우 수화 지연성은 커졌고, 리그노 술폰산, 폴리카복실레이트, 멜라민, 나프탈렌 술폰산 축합물 순으로 시멘트페이스트 초기 수화를 지연시켰다. 그러나, 이들 고유동화제를 사용할 경우, 시멘트의 분산성을 개선시켜 수화 생성물이 보다 치밀하고 균일했다.

Keywords

References

  1. 박승범, 전상진, '혼화제의 사용현황 및 전망', 콘크리트학회지, 8권 2호, 1996, pp.5-12
  2. L. H. Grierson, J. C. Knight, and R. Maharaj, 'The role of calcium ions and lignosulphonate plasticiser in the hydration of cement', Cement & Concrete Research, Vol.35, 2005, pp.631 -636 https://doi.org/10.1016/j.cemconres.2004.05.048
  3. 김병기, 김송호, '콘크리트용 화학 혼화제의 개발 및 연구의 최신 동향', 콘크리트 학회지, 14권 1호, 2002, pp.38-43
  4. I. Papayianni, G. Tsohos, N. Oikonomou, and P. Mavria, 'Influence of superplasticizer type and mix design parameters on the performance of them in concrete mixtures', Cement and Concrete Composites, Vol.27, 2005, pp.217-222 https://doi.org/10.1016/j.cemconcomp.2004.02.010
  5. 김상철, 유호석, '수중 불분리성 콘크리트용 혼화제의 특성과 영향', 콘크리트학회지, 13권 2호, 2001, pp.30-37
  6. Pipat Tennkhajomkit and Toyoharu Nawa, 'The fluidity of fly ash - cement paste containing naphthalene sulfonate superplasticizer', Cement & Concrete Research, Vol.34, 2004, pp.1017-1024 https://doi.org/10.1016/j.cemconres.2003.11.017
  7. Yutaka Nakajima and Kazuo Yamada, 'The effect of the kind of calcium sulfate in cements on the dispersing ability of poly $\beta$-naphthalene sulfonate condensate superplasticizer', Cement & Concrete Research, Vol.34, 2004, pp.839-844 https://doi.org/10.1016/j.cemconres.2003.09.022
  8. S. Chandra and J. Bjornstrom 'Influence of cement and superplasticizers type and dosage on the fluidity of cement mortars-Part I', Cement & Concrete Research, Vol.32, 2002, pp.1065-1611
  9. S. Chandra and J. Biomstrom 'Influence of cement and superplasticizers type and dosage on the fluidity of cement mortars-Part II', Cement & Concrete Research, Vol.32, 2002, pp.1613-1619 https://doi.org/10.1016/S0008-8846(02)00838-4
  10. Shunsuke Hanehara and Kazuo Yamada, 'Interaction between cement and chemical admixture from the point of cement hydration, absorption behaviour of admixture, and paste rheology', Cement & Concrete Research, Vol.29, 1999, pp.1159-1165 https://doi.org/10.1016/S0008-8846(99)00004-6
  11. H. Uchikawa, S. Uchida, K. Ogawa, and S. Hanehara, 'Influence of CaSO4 . 2H2O, CaSO4 . l/2H2O, and CaSO4 on the initial hydration of clinker with different burning temp.', Cement & Concrete Research, Vol.14, 1984, pp.645-656 https://doi.org/10.1016/0008-8846(84)90027-9
  12. H. Uchikawa, S. Hanehara, T. Shirasaka, and D. Sawaki, 'Effect of admixture in hydration of cement, adsorptive behavior of admixture, and fluidity and setting of fresh cement paste', Cement & Concrete Research, Vol.22, 1992, pp.1115-1129 https://doi.org/10.1016/0008-8846(92)90041-S
  13. W. Sha, E. A. O'Neill, and Z. Guo, 'Differential scanning calorimetery study of ordinary portland cement', Cement & Concrete Research, Vol.29, 1999, pp.1487-1489 https://doi.org/10.1016/S0008-8846(99)00128-3