ASPHALT와 CARBON BLACK으로 처리된 고내구성 포틀랜드시멘트의 수화특성

조헌영; 김희락; 홍원표

Journal of the Korean Industrial and Engineering Chemistry, Vol.3, No.1, 148-155, March, 1992

Export Citation

ASPHALT와 CARBON BLACK으로 처리된 고내구성 포틀랜드시멘트의 수화특성

The Hydration Characteristics of High-Durable Portland Cement Treated with Asphalt and Carbon Black

조헌영, 김희락, 홍원표

초록

콘크리트의 내구성을 향상시키는 기존의 공법과는 다르게, 시멘트 입자 표면에 아스팔트 벽을 부분적으로 형성시킨 후 카본블랙을 처리하여 콘크리트의 전반적인 내구성을 현격히 향상시킨 고내구성 포틀랜드시멘트(ACTPC)의 수화반응 특성을 X-Ray, SEM, 전도열량계 등을 사용하여 조사한 결과는 다음과 같다. ACTPC가 물과 접촉하면 발수성을 나타내는 아스팔트 벽은 시멘트 입자와 물의 접촉 및 시멘트 입자로부터 각종 이온들의 용출을 방해하여 초기 수화반응이 억제되지만, 카본블랙은 결정핵 역할을 하므로 일정기간이후의 수화반응을 촉진한다.

For the enhancement of the concrete durability, we developed high - durable portland cement (ACTPC) by physical treatment of ordinary portland cement with asphalt and carbon black. In this research, the hydration reaction characteristics of ACTPC were studied by using SEM, X-Ray, Conduction Micro Calolimeter etc. When the ACTPC is mixed with water, it is believed the asphalt films on cement particles suppress the early stage of hydration reactions of cements, because the films hinder the contact with water and the elusion of soluble ions from particles. But the carbon blacks on the cement particles accelerated the hydration reactions of cement after a while, because the micro particles can be used as seed crystals in CaO-SiO₂-H₂O gel formation.

[References]

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황의환, "중·저준위 방사성 폐기물 처분 용기용 콘크리트의 물성 개선에 관한 연구," 충남대 대학원, 2월 (1988)
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[1] Rixom MR, "Chemical Admixtures for Concrete," London. E. & F.N. Spon Ltd. (1978)

[2] 황의환, "중·저준위 방사성 폐기물 처분 용기용 콘크리트의 물성 개선에 관한 연구," 충남대 대학원, 2월 (1988)

[3] Kumar A, Roy DM, "The Effect of Desiccation on the Porosity and Pore Structure of Freeze Dried Hardened Port-land Cement and Slag-blended Pastes," Cement and Concrete Research, Vol. 16 (1986)

[4] Hughes DC, "Pore Structure and Permeability of Hardened Cement Paste," Magazine of Concrete Research: Vol. 37, No. 133: December (1985)

[5] Young JF, "A Review of the Mechanisms of Set-Retardation in Portland Cement Pastes Containg Organic Admixture," Cement and Concrete Research, Vol. 2 (1982)

[6] Sychev MM, Kazanskaya EN, "Investigation of Elementary Steps of Hydration in Cements," 1982 Plenum Publishing Corporation (1982)

[7] Ngab AS, Nilson AH, Slate FO, "Shrinkage and Creep of High Strength Concrete," ACI Journal, July-August (1987)

[8] Ferraris CF, Wittmann FH, "Shrinkage Mechanisms of Hardened Cement Paste," Cement and Concrete Research, Vol. 17 (1987)

[9] Bishara AG, Rose JD, "Shrinkage and Creep Characteristics of Latex-Modified Concrete," ACI Journal, May (1978)

[10] Kasai Y, "Corrosion of Reinforcing Steel in Concrete and Corrosion Inhibiter," Concrete Journal Vol. 21, No. 3, March (1983)