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침투형 Nano-Coat를 이용한 콘크리트 열화 방지 적용성 평가

Evaluation of Applicability of penetrating-type Nano-Coat for Preventing Deterioration of Concrete

  • 투고 : 2016.05.12
  • 심사 : 2017.03.16
  • 발행 : 2017.04.17

초록

PURPOSES : Infiltration of moisture, polluted material, and deicer into concrete, accompanied by freeze and thaw can cause significant deterioration of concrete pavement. In order to protect concrete from deterioration, it is necessary to prevent the infiltration of these concrete external materials. The moisture-repellent agent, which is a surface treatment and maintenance material added to concrete structures to render them water resistant, has advantages such as prevention of water infiltration and security against air permeation. Nano-coat, which is referred to as silicon hydride, is typically used as a moisture-repellent agent. Therefore, in this study, an attempt is made to use penetration-type Nano-coat as an alternative in order to evaluate its applicability through environmental resistance tests. METHODS : This study aimed to evaluate the applicability of penetration-type Nano-coat, which can provide water repellency to concrete, in concrete pavements, through various environmental resistance tests such as freezing and thawing resistance, chloride ion penetration resistance, and surface scaling resistance tests. The applicability of penetration-type Nano-coat was demonstrated based on the specification of KS F 2711, KS F 2456, and ASTM C 672. RESULTS :In the case of penetration-type Nano-coat applied on sound concrete, an increase in concrete durability was demonstrated by the negligible chloride ion penetrability and the absence of scaling, as revealed by visual observation of the surface, after 50 cycles of scaling resistance test. In addition, test result of the application of penetration-type Nano-coat on deteriorated concrete established that concrete surface pretreated by grinding provided improved durability than non-treated concrete. CONCLUSIONS :This study indicates that penetration-type Nano-coat is applicable as an effective alternative, to increase the durability of concrete structures. In addition, it was known that pretreatment of deteriorated concrete surface, such as grinding, is required to improve the long-term performance of concrete pavement.

키워드

참고문헌

  1. ASTM C 672, Standard Test Method for Scaling Resistance of Concrete Surfaces Exposed to Deicing Chemicals.
  2. Hwang I. D., Youm H. N., Chung Y. J., 2000, The Emulsification of Silane as Water Repellent for Concrete, Journal of the Korean Ceramic Society, 37(8), pp. 760-767.
  3. KS F 2711, Testing method for resistance of concrete to chloride ion penetration by electrical conductance.
  4. KS F 2456, Standard test method for resistance of concrete to rapid freezing and thawing.
  5. Lee, J. S., 2004, Comparative study on repellent ability of silane repellent according to type and treatment method, Master's Thesis, University of Ulsan.
  6. Lee, J. Y., 2006, An Experimantal Study on the Characteristics of Penetrating Surface Protection Materials to Promote Concrete Structure Durability, Master's Thesis, Seoul National University of Science and Technology.
  7. Lee, S. W., Kim Y. K., Lee P. H., 2011, A Study on the Application of Very Rapid Hardening Acrylic Polymer Modified Concrete for Bonded Concrete Overlay Method, Journal of the Korean Society of Road Engineers, 13(1), pp. 139-148.
  8. Oh S. K., Ahn S. D., Shim S. M., 2001, A Study on Effect of Silane Solution of Capillary Coating Type as Protection Agent of Absorption for the Durability Improvement in Concrete Surface Layer, Journal of the Architectural Institute of Korea Structure & Construction, 17(12), pp. 149-158.
  9. Park, H. W., Song, H. W., Baek, J. M., Woo, J. T., Nam, J. W., 2003, An Experimental Study on Durability Evaluation of Nano Composite Hybrid Polymer Type Coatings Applied Concrete, Journal of the Korea Concrete Institute, pp. 687-692.
  10. Smith, M. D. (1986). Silane chemical protection of bridge decks (No. FHWA/OK 86 (4)).