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섬유를 혼입한 지하층 누름콘크리트의 균열저감을 위한 연구

A Study on Crack Reduction of Covering Concrete with Fibers in Basement

  • 투고 : 2014.08.22
  • 심사 : 2015.01.08
  • 발행 : 2015.01.31

초록

본 연구에서는 섬유를 혼입한 지하층 누름콘크리트의 균열 저감 특성에 관하여 분석되었다. 섬유의 최적 혼입량과 종류를 알아보기 위해 공기량, 슬럼프, 압축강도, 인장강도 및 소성수축시험을 실시하였다. 공기량 시험결과, 섬유를 혼입한 시편들이 플레인에 비하여 높은 공기량이 나타났다. 그리고 유동성 측정결과, 섬유를 혼입한 시편들이 플레인에 비하여 40-80%낮은 슬럼프를 나타냈다. 강토 특성에서는 섬유를 혼입한 시편들이 무근콘크리트에 비하여 높은 압축 및 인장강도를 나타냈다. 소성수축 시험결과 섬유를 혼입한 시편들이 플레인에 비하여 균열발생이 감소하였으며, 특히 NY섬유를 혼입한 시편의 경우에는 균열이 발생하지 않았다. 결과적으로 NY섬유를 0.6% 혼입하였을 때 누름 콘크리트에 최적의 특성을 나타내는 것을 알 수 있었다.

The purpose of this study is to estimate crack reduction properties of covering concrete with fibers in basement. Air contents, slump, compressive strength, tensile strength and plastic shrinkage has been tested to conduct the optimum addition ratio and type of fiber. The results is a following. For the properties of air contents, all of the specimens added fibers shown the higher than plain concrete. For the flowability, slump decreased about 40-80% when all of the specimens added fibers. For the strength properties, the specimens added nylon fiber shown higher compressive and tensile strength about 5-15% comparing with other concrete. For the plastic shrinkage, cracking decreased when the fiber added comparing with plain concrete. Especially, when nylon fiber added in the concrete, the plastic shrinkage did not occurred. For the overall consideration, when the addition ratio of nylon fiber is 0.6%, the press concrete is identified as showed optimum properties.

키워드

참고문헌

  1. Won, JP, Park, CG, and Ahn, TS, "Experimental Study for Plastic Shrinkage Cracking of Cellulose Fiber Reinforced Concrete," Korea Concrete Institute Fall Conference, Vol.02, No.2, pp.12-19, 1998.
  2. Oh, BH, Lee, HJ, and Kang, YJ, "Strength and Mechanical Characteristics of Fiber-Reinforced Concrete," Journal of the Korean Society of Civil Engineering, Vol.19, No.3, pp.49-56, 1989.
  3. Benter, A. and Mindess, S, "Fiber Reinforced Cementitious Composites," Elsevier Science, London, 1990.
  4. Betterman, LR, Ouyang, CS, and Shah, P, "Fiber Matrix interaction in Micro Fiber-reinforced Mortar," Advanced Cement Based Materials, Vol.2, No.2, pp.53-61, 1995. DOI: http://dx.doi.org/10.1016/1065-7355(95)90025-X
  5. Lawer, JS, Zampini, D, and Shah, SP, "Permeability of Cracked Hybrid Fiber-reinforced under Load," American Concrete Institute (ACI) Materials Journal, Vol.99, No.4, pp.15-23, 2000.
  6. Banthia and Nandakumar, N, "Crack Growth Resistance Hybrid Fiber-reinforced Cement Composites," Cement Concrete Comp, Vol.25, No.1, pp.3-9, 2003. DOI: http://dx.doi.org/10.1016/S0958-9465(01)00043-9