JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2019, Vol. 36 ›› Issue (2): 139-143.DOI: 10.11988/ckyyb.20170811

• HYDRAULIC STRUCTURE AND MATERIAL • Previous Articles     Next Articles

Influence of Age on Double-K Fracture Parameters of Roller Compacted Concrete

LI Gen1,2,WANG Xue-zhi1,ZHANG Xiao-fei3,CHEN Yi-qin4,HU Ke-xin1,LI Chun-rui1   

  1. 1.School of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou 121000, China;
    2.Saidaweiye Co., Ltd., Tianjin 300000, China;
    3.Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China;
    4.Construction and Development Centre of Road & Bridge Engineering of Weifang City, Weifang 261061, China
  • Received:2017-07-19 Revised:2017-07-27 Online:2019-02-01 Published:2019-03-11

Abstract: The influence of age on Double-K fracture parameters of roller-compacted concrete (RCC) was investigated via fracture test on eighteen RCC wedge splitting specimens at different ages (28 d, 60 d, and 90 d). The effective crack length, initial fracture toughness and unstable fracture toughness of the RCC specimens of different ages were acquired. Results revealed that with the growth of age, the critical pressure for initial cracking and critical pressure for instability both expanded, and the ratio of critical pressure for initial cracking to critical pressure for instability also increased. With the age increasing from 28 d to 90 d, initial cracking toughness KiniIC and unstable cracking toughness KunIC climbed by 0.216 0 MPa·m1/2 and 0.292 2 MPa·m1/2, respectively; the ratio of KiniIC to KunIC maintained between 0.5 and 0.6 in general. Effective critical cracking length and subcritical crack extension both changed in a negative relation with age, implying that smaller age results in better toughness of specimens.

Key words: roller-compacted concrete, double-K fracture parameters, age, wedge splitting test, fracture toughness

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