Proceedings of the Korea Concrete Institute Conference (한국콘크리트학회:학술대회논문집)

Korea Concrete Institute (한국콘크리트학회)
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FRACTAL SURFACE ROUGHNESS OF CONCRETE

  • Roh Y.S. (Seismic Retrofitting and Remodeling Research Center) ;
  • Xi Yunping (CEAE, University of Colorado at Boulder) ;
  • Chung L. (Architectural Engineering, Dankook University)
  • Published : 2004.11.01
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Abstract

In this study, the roughness of fracture surfaces in cementitious material has been characterized by roughness number (RN). A systematic experimental investigation was carried out to examine the dependency of fracture parameters on the aggregate sizes as well as the loading rates. Three aggregate sizes (0.1875 in, 0.5 in, and 0.75 in) and two loading rates (slow and fast loading rate) were used. A total of 52 compression tests and 53 tension tests were performed. All fracture parameters exhibited an increase, to varying degrees, when aggregates were added to the mortar matrix. The fracture surfaces of the specimens were digitized and analyzed. Fracture roughness was monotonically increased as maximum aggregate sizes increase.

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