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Water Repellent Characteristics of Cement Paste Added Silane/siloxane-based Emulsion Water Repellent

실란/실록산계 에멀전 발수제를 혼입한 시멘트 페이스트의 발수특성

  • Received : 2020.10.30
  • Accepted : 2020.12.23
  • Published : 2021.02.20

Abstract

The aim of this paper is to improve durability of cement paste by imparting hydrophobicity to the surface and sphere of cement-based materials. A cement paste mixed with a silane/siloxane-based water repellent, and the initial hydration performance, flow performance, and age-specific compressive strength were measured. In addition, the water contact angle, SEM, and XRD before and after surface polishing were measured. When 0.5% of the silane/siloxane-based water repellent was mixed into the cement paste, the compressive strength increased, but the compressive strength decreased as the mixing amount increased by 1.5% and 3.0%. When a silane/siloxane water repellent was incorporated into the cement paste, the hydrophilicity was improved and the contact angle was increased due to hydrophobicity. In addition, the contact angle after surface polishing was found to be larger than the contact angle before surface polishing.

본 논문은 시멘트계 재료의 표면 및 구체에 소수성을 부여하여 내구성을 향상시키기 위한 기초연구이다. 실란/실록산계 혼합형 발수제를 혼입한 시멘트 페이스트를 제조하고 초기 수화성능 및 유동성능, 재령별 압축강도를 측정하였다. 또한 표면연마 전후의 물접촉각 및 SEM, XRD를 측정하였다. 실란/실록산계 혼합형 발수제를 혼입한 시멘트 페이스트의 플로우는 발수제 혼입량을 1.0%씩 높일수록 증가하였다. 실란/실록산계 혼합형 발수제를 혼입할 경우 시멘트 페이스트의 응결시간은 초결 및 종결 모두 지연되는 것으로 나타났다. 이러한 지연은 소수성에 기인하여 실란/실록산계 발수제를 클링커 입자 근처에 배치하여 소수성 장벽을 생성하기 때문이다. 실란/실록산계 혼합형 발수제를 시멘트 페이스트에 0.5% 혼입할 경우 압축강도는 증가하였으나 혼입량이 1.5%, 3.0% 증가할수록 압축강도는 감소하는 것으로 나타났다. 최대 혼입량 3.0%일 경우 압축강도는 최대 8.3%까지 감소하는 것으로 나타났다. 이는 발수제가 시멘트의 수화를 지연 및 방해하여 압축강도가 저하된 것으로 판단된다. 실란/실록산계 발수제를 시멘트 페이스트에 혼입할 경우 친수성이 개선되며 소수성을 나타내 접촉각이 커지는 것으로 나타났다. 또한 표면연마 후 접촉각은 표면연마 전보다 커지는 것으로 나타났다. 실란/실록산계 혼합형 발수제의 혼입은 표면뿐만 아니라 연마로 인하여 손상된 표면과 단면에서도 소수성을 나타내었다.

Keywords

References

  1. Kim YS, Yang SD, Yoo JK, Oh SK. An experimental study on the water repellent property of mortar applied water repellent agent of inorganic polymer type. Journal of the Architectural Institute of Korea. 2002 Apr;22(1):273-6.
  2. Ryu JH, Shon MS. Evaluation of water resistance of penetrating water repellency for scaling by de-icing agent. Conference Proceedings of Korea Concrete Institute; 2015 Oct 21-23; Gyeongju, Korea. Seoul (Korea): Korea concrete institute; 2015. p. 401-2.
  3. Park MJ, Noh JH. Porosity and abrasion resistance of concrete coated by surface enhanced type water repellent. Journal of the Korea Institute for Structural Maintenance and Inspection. 2019 Jul;23(4):31-6. https://doi.org/10.11112/jksmi.2019. 23.4.31
  4. Kanda T, Victor CL. Interface property and apparent strength of high-strength hydrophilic fiber in cement matrix. Journal of materials in civil engineering. 1998 Feb;10(1):5-3. http://dx.doi.org/10.1061/(ASCE)0899-1561(1998)10:1(5)
  5. Sun HY, Yuan ZY, Yang GL, Shan GL, Shen MX. Status and prospect of test methods of quality silicone water repellent for protecting reinforced concrete. Corrosion Science and Technology. 2017 Jun;16(3):141-50. http://dx.doi.org/10.14773/cst.2017.16.3.141
  6. Boesel LF, Reis RL. A review on the polymer properties of hydrophilic, partially degradable and bioactive acrylic cements(HDBC). Progress in polymer science. 2008 Feb; 33(2):180-90. http://doi.org/10.1016/j.progpolymsci.2007.09.001
  7. Pallapothu, Swamy NRG, Garje RK, Madduru Sri RC, Pancharathi, Rathish K. Influence of hydrophilic compounds on the performance of recycled aggregate concretes. Journal of sustainable cement-based materials. 2017 Jan;6(5):332-44. https://doi.org/10.1080/21650373.2017.1280429
  8. Zeng Q ,Li K ,Fen CT ,Dangla P. Analysis of pore structure, contact angle andpore entrapment of blended cement pastes from mercury porosimetry data. Cement and Concrete Composites. 2012 Oct;34(9):1053-60. https://doi.org/10.1016/j.cemconcomp.2012.06.005
  9. Tian Q, Zhang H, Wang YJ, Guo F, YaoT, Liu JP. Determining the contact angle of hardened cement paste using thin layer wicking method. Key Engineering Materials. 2013 Jan; 539:184-8. http://dx.doi.org/10.4028/www.scientific.net/KEM.539.184
  10. Kim TY, Jeong J, Chung Id. Preparation of superhydrophobic surfaces using agglomeration control of silicananoparticles by organic solvent and non-fluoride self-assembled monolayers. Journal of Adhesion and Interface. 2015 Sep;16(3):116-21. https://doi.org/10.17702/jai.2015.16.3.116
  11. Adolphs J, Setzer MJ, Heine P. Changes in porestructure and mercury contact angleof hardened cement pastedependingon relative humidity. Materials and Structures. 2002 Sep;35(252):477-86. http://dx.doi.org/10.1007/BF02483135
  12. Song KW, Chen GF, Zhang H, Shi CL, Yang J. Mechanism research of drying shrinkage of cement pastes based on the contact angle. Applied Mechanics and Materials. 2014 Oct;670-671:391-5. http://dx.doi.org/10.4028/www.scientific.net/AMM.670-671.391
  13. Klein NS, Bachmann J, Aguado A, Toralles CB. Evaluation of the wettability of mortar component granular materials through contact angle measurements. Cement and concrete research. 2012 Dec;42(12):1611-20. http://dx.doi.org/10.1016/j.cemconres.2012.09.001
  14. Spaeth V, Lecomte JP, Delplancke MP, Orlowsky J, Buttner T. Impact of silane and siloxane based hydrophobic powder on cement-based mortar. Advanced Materials Research. 2013 Apr;687:100-6. http://dx.doi.org/10.4028/www.scientific.net/AMR.687.100
  15. Kim WS, Yang H, Kim YK, Lee HS. An Experimental Study on Physical Properties and Water Repellent Performance of Cement Mortar According to Mixing Method of Water Repellent. In Proceedings of the Korean Institute of Building Construction Conference; 2019 Sep 15-17; Yeosu Gyeongdo Resort, Yeosu, Korea. Seoul (Korea): The Korean Institute of Building Construction; 2019. p. 99-100.
  16. Collodetti G, Gleize PJP, Monteiro PJM. Exploring the potential of siloxane surface modifiednano-SiO2 to improve the Portland cement pastes hydration properties. Construction and Building Materials. 2014 Mar ;54:99-105. http://dx.doi.org/10.1016/j.conbuildmat.2013.12.028
  17. Meng X, Yoshida K, Taira Y,Kamada K, Luo X. Effect of siloxane quantity and ph of silane coupling agents and contact angle of resin bonding agent on bond durability of resin cements to machinable ceramic. Journal of Adhesive Dentistry.2011 Feb;13(1):71-8. http://dx.doi.org/10.3290/j.jad.a20179
  18. Feng Z, Fajun W, Xie T, Ou, J, Xue M, Li W. Integral hydrophobic concrete without using silane. Construction and Building Materials. 2019 Dec;227:116678. http://dx.doi.org/10.1016/j.conbuildmat.2019.116678
  19. Baltazar L, Rodrigues MP, Correia JR. Hydrophobic protection for concrete: Short-term performance and durability. Restoration of Buildings and Monuments. 2013 Dec;19(4):267-78. http://dx.doi.org/10.1515/rbm-2013-6607
  20. KS L ISO 679. Methods of testing cements-Determination of sterngth. Korean Agency for Technology and Standards. 2016. 16 p.
  21. KS L 5103. Testing method for setting time of hydraulic cement by Gilmour needles. Korean Agency for Technology and Standards. 2016. 5 p.
  22. KS F 2476. Standard test method for polymer-modified cement mortar. Korean Agency for Technology and Standards. 2019. 20 p.
  23. KS L 2110. Testing method of wettability of glass substrate. Korean Agency for Technology and Standards. 2016. 11 p.
  24. Li Z, Lu D, Gao X. Analysis of correlation between hydration heat release and compressive strength for blended cement pastes. Construction and Building Materials. 2020 Nov;260:120436. http://dx.doi.org/10.1016/j.conbuildmat.2020.120436
  25. Kim JH, Kitagaki, R. Behavior of hydrates in cement paste reacted with silicate-based impregnant. Cement and Concrete Composites. 2020 Nov;114;103810. https://doi.org/10.1016/j.cemconcomp.2020.103810