Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Effect of Properties of Repair Mortars According to Pre-mixing Methods

원료 사전 혼합 방법에 따른 보수 모르타르의 물성에 대한 영향

  • 신동철 (가천대학교 건축공학과) ;
  • 강용학 (한국건설생활환경시험연구원)
  • Received : 2017.05.04
  • Accepted : 2017.05.26
  • Published : 2017.07.01
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Abstract

It is important to keep the distribution of the raw material mixture constant, in order to maximize the effect of the pre-mix type repair mortar, and it is also necessary to increase the performance of the mixer in order to minimize the deviation of the product. In this study, three kinds of mixer used in production sites were used to make repair mortar and the properties of each mortar were examined. As a result, it is confirmed to the difference in properties of pre-mix type repair mortar differ depending on the type of mixer, and the fluidized zone mixer showed relatively good results. In addition, it is preferable to set the mixing time to about 10 minutes to 15 minutes in order to ensure workability and optimum physical properties.

프리믹스 타입의 보수 모르타르는 제조 과정에서 여러 원료들을 동시에 혼합해야 하므로, 혼합 시 생산 제품의 효과를 극대화하기 위해서는 원료 혼합 분포를 일정하게 하는 것이 중요하며, 생산 제품의 효과의 편차를 최소화하기 위해서는 혼합 설비의 성능을 높일 필요가 있다. 따라서 본 연구에서는 실제 생산 현장에서 활용되는 대표적인 혼합설비 3종을 대상으로 보수 모르타르를 제조하고 각각의 제반물성을 검토하였다. 그 결과, 프리믹스 타입 보수 모르타르의 제반 물성은 혼합설비의 종류에 따라 차이가 있었으며, 무중력 믹서가 상대적으로 우수한 결과 값을 보였다. 또한 작업성 및 최적 물성을 확보하기 위해 혼합시간을 10분에서 15분 정도로 하는 것이 바람직함을 확인하였다.

Keywords

References

  1. Bae. S. C., and Hyung, W. G. (2013), Properties of Polymer Modified Mortars Using Re-dispersible Polymer Powders, Journal of the Korea Institute of Building Construction, 13(3), 235-241. https://doi.org/10.5345/JKIBC.2013.13.3.235
  2. Cho, Y. I., Hong, K. N., Kim, M. S., and Park, J. K. (2016), Effect of Curing Temperature on Mechanical Properties of Polymer Mortar for Urgent Repairing, Journal of the Korean Society of Safety, 31(5), 109-116. https://doi.org/10.14346/JKOSOS.2016.31.5.109
  3. Chung. W. K., and Choi, D. Y. (2011), Study on the High Speed Cement Blending Machine for the Production of High Functional Concrete, Journal of the KIPS, 13(4), 43-47.
  4. Han. C. G., and Lee, H. I. (2009), Physical Analysis of High Strength Concrete According to Mixing Methods of Binders for Application Analysis of Pre-Mix Cement, Journal of the Korea Institute of Building Construction, 9(5), 127-133. https://doi.org/10.5345/JKIC.2009.9.5.127
  5. KS F 2763 (2012), Testing method for determining the stiffening time of products for the repair of concrete structures by penetration resistance, Korean agency for Technology and Standard.
  6. KS L 5105 (2012), Testing method for compressive strength of hydraulic cement mortar, Korean agency for Technology and Standard.
  7. KS L ISO 679 (2016), Methods of testing cements-Determination of strength, Korean agency for Technology and Standard.
  8. Paik, S. W. (2003), An Experimental Study on the Strength and Permeability Characteristics of Repair Mortar, Journal of the KIIS, 18(4), 105-109.
  9. Park, K. -B., Plawsky, J. L., Littman, H., and Paccione, J. D. (2006), Mortar properties obtained by dry premixing of cementitious materials and sand in a spout-fluid bed mixer, Cement and Concrete Research, 36, 728-734. https://doi.org/10.1016/j.cemconres.2005.10.012
  10. Plawskya, J. L., Jovanovic, S., Littman, H., Hover, K. C., Gerolimatos, S., and Douglas, K. (2003), Exploring the Effect of Dry Premixing of Sand and Cement on the Mechanical Properties of Mortar, Cement and Concrete Research, 33, 255-264. https://doi.org/10.1016/S0008-8846(02)00927-4
  11. Sohn, Y. S., Lee, J. H., Lee, S. H., and Cha, W. H. (2010), The Characteristics of Ultra-High-Strenght Concrete by Mixing Method of Pre-Mix Cement, Proceedings of Korea Concrete Institute, Korea, 173-174.
  12. Song, H. S., Lee, C. Y., and Min, C. S. (2006), Effect of Silica Fume in Properties of Polymer Cement Mortar for Concrete Repair, Proceedings of Korea Concrete Institute, Korea, 617-620.
  13. Yuzo, A. (1964), Studies on Performance of Compulsory and Conventional Mixers and on Test Methods of Mixer Performance, Report of Port and Harbour Technical Research, Institute Ministry of Transportation, Japan, 3(4), 1-40.