DOI QR코드

DOI QR Code

Corrosion-Inhibition and Durability of Polymer-Modified Mortars Using Redispersible Polymer Powder with Nitrite-Type Hydrocalumite

재유화형 분말수지와 아질산형 하이드로칼루마이트를 병용한 폴리머 시멘트 모르타르의 방청성 및 내구성

  • Kim, Wan-Ki (Department of Architectural Engineering, Hyupsung University) ;
  • Hong, Sun-Hee (Graduate School, Hyupsung University)
  • Received : 2011.11.21
  • Accepted : 2012.02.17
  • Published : 2012.06.20

Abstract

Nitrite-type hydrocalumite (calumite) is a material that can adsorb the chloride ions ($Cl^-$)that cause the corrosion of reinforcing bars and liberate the nitrite ions ($NO_2{^-}$) that inhibit corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. In this study, VA/E/MMA-modified mortars with calumite were prepared with various calumite contents and polymer binder-ratios, and tested for corrosion inhibition, chloride ion penetration, carbonation and drying shrinkage. As a result, regardless of polymer-binder ratio, the replacement of ordinary Portland cement with hydrocalumite has a marked effect on the corrosion inhibiting property of the polymer-modified mortars. However, chloride ion penetration and carbonation depths are somewhat increased with higher calumite content, but can be remarkably decreased depending on the polymer-binder ratios. The 28-d drying shrinkage shows a tendency to increase with the polymer-binder ratio and calumite content. VA/E/MMA-Modified mortars with 10 % calumite did not satisfy KS requirements. Accordingly, a calumite content of 5 % is recommended for the VA/E/MMA-modified mortars with calumite.

본 연구는 철근 콘크리트 구조물의 장수명화를 위해 고성능 다기능 폴리머 시멘트 복합체의 개발을 목적으로, 우수한 성능을 갖는 VA/E/MMA (Vinyl Acetate/Ethylene/Methyl Methacrylate) 터폴리머 분말수지와 아질산형 하이드로칼루마이트를 병용한 폴리머 시멘트 모르타르의 염화물이온 침투 저항성, 중성화 저항성, 건조수축 및 철근부식 촉진시험을 통하여 그 내구성과 방청성을 검토하는 것이다. 그 결과, 폴리머 결합재비에 관계없이 칼루마이트의 치환에 의해 폴리머 시멘트 모르타르의 내구성이 일부 저하하는 경향을 보였으나, 이는 폴리머 결합재비의 증가에 따라 크게 개선되었다. 방청성의 경우 VA/E/MMA 분말수지 사용으로 시멘트 매트릭스 내 생성된 폴리머 필름에 의한 이온 및 가스투과 저항성 증대와 칼루마이트의 이온교환반응에 따른 염화물 이온 흡착 및 아질산 이온을 방출하는 자기방청기능에 의하여 우수한 방청효과를 보였다. 따라서, 철근콘크리트 구조물의 장수명화를 위해 VA/E/MMA 터폴리머 분말수지와 아질산형 하이드로칼루마이트의 병용에 의해 우수한 방청성과 내구성을 갖는 폴리머 시멘트 복합체의 개발이 가능할 것으로 판단된다.

Keywords

References

  1. Cresson L. Improved manufacture of rubber road-facing, rubber-flooring, rubber-tiling or other rubber-lining, British Patent 191, 474. 1923 Jan 12.
  2. Ohama Y, Demura K, Kim WK. Properties of polymer-modified mortars using redispersible polymer powders. In: Yeon KS, Choi JD, editors. The First East Asia Symposium on Polymers in Concrete. Proceedings of the First East Asia Symposium on Polymers in Concrete. 1994 May 2-3; Kangwon National University, Chuncheon, Korea. Chuncheon (Korea): Kangwon National University; 1994. p. 81-90.
  3. Ohama Y. Principle of latex modification and some typical properties of latex-modified mortars and concretes. ACI Materials Journal. 1987 Nov 1;84(6):511-8.
  4. Hackel E, Beng P, Horler S. The use of redispersible polymer powders in concrete restoration. In: Stynes BW, editor. The production, performance & potential of polymers in concrete. Proceedings of the 5th International Congress on Polymers in Concrete. 1987 September 22-24; Brighton Polytechnic, Brighton, UK. Brighton (UK): Brighton Polytechnic; 1987. p. 305-8.
  5. Afridi MUK, Ohama Y, Demura K, Iqbal MZ. Development of polymer films by the coalescence of polymer particles in powdered and aqueous polymer-modified mortars. Cement and Concrete Research. 2003 Nov;33(11):1715-21. https://doi.org/10.1016/S0008-8846(02)01094-3
  6. Tatematsu H, Sasaki T. Studies on diagnosis and repair for reinforcing bar corrosion by salt injury. Transaction of Japan Concrete Institute. 2000 June;22:211-20.
  7. Maruyama N, Tanaka Y, Lijima T. Follow-up study of external salt-damaged reinforced concrete structure(In Japanese). Proceedings of Japan Society of Civil Engineers the 57th Annual Academic Conference; 2002 Sept 25-27; Hokkaido University, Sapporo, Japan. Sappro (Japan): JSCE; 2002. V-167 p. 333-4.
  8. Ohama Y, Miyamoto Y, Tatematsu H. Effects of mix proportioning factors on properties of epoxy-modified mortars without hardener, containing nitrite-type hydrocalumite. In: Oh BH et al, editors. Concrete under Severe Conditions: Environment & Loading. Proceedings of the 4th International Conference on Concrete under Severe Conditions: Environment & Loading; 2004 June 27-30; Seoul, Korea. Seoul (Korea): KCI; 2004. p. 1473-80.
  9. Kim WK. Strengths and corrosion inhibition of polymer -modified mortars using a terpolymer powder with nitrite-type hydrocalumite. Journal of the Architectural Institute of Korea. 2011 Jan;27(1):145-52.
  10. Gokaku W, Wada H, Tatematsu H. High corrosion inhibition type patching repair method by salt adsorbent (In Japanese). 2010 Chugoku Regional Construction Technology Symposium; 2010 Nov 9; Shimane (Japan). Shimane (Japan): [publisher unknown]: 2010.
  11. Goto S, Roy DM. The effect of W/C ratio and curing temperature on the permeability of hardened cement paste. Cement and Concrete Research. 1981 July;11(4): 575-79. https://doi.org/10.1016/0008-8846(81)90087-9
  12. Mehta PK. Studies on blended portland cements containing santorin earth. Cement and Concrete Research. 1981 July;11(4):507-18. https://doi.org/10.1016/0008-8846(81)90080-6
  13. Feldman RF. Significance of porosity measurements on blended cement performance. American Concrete Institute ACI SP-79. Proceedings of the CANMET/ACI First International Conference on The Use of Fly Ash, Silica Fume, Slag and other Mineral By-Products in Concrete; 1983 July 31-August 5; Montebello, Canada. Ottawa(Canada): ACI Publication; 1983. p. 415-33.
  14. Uchikawa H. Effect of blending component on hydration and structure formation. 8th International Congress on the Chemistry of Cement Vol. I. Proceedings of 8th International Congress on the Chemistry of Cement; 1986; Rio de Janeiro, Brazil. Rio de Janeiro (Brazil): p. 249-80.
  15. Bentur A, Kung JH, Young JF, Milestone NB, Lawrence FV. Influence of microstructure on the creep and drying shrinkage of calcium silicate pastes silicate de calcium. 7th International Congress on the Chemistry of Cement Vol.3. Proceeding of 7th International Congress on the Chemistry of Cement; 1980; Paris, France. Paris(France): 1980. p.VI-26-31

Cited by

  1. Properties of Polymer Modified Mortars Using Re-dispersible Polymer Powders vol.13, pp.3, 2013, https://doi.org/10.5345/JKIBC.2013.13.3.235