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Date of Publication:2022-10-06

Journal:应用基础与工程科学学报

Volume:24

Issue:6

Page Number:1219-1231

ISSN No.:1005-0930

Abstract:This paper experimentally presents the minimum specimen size for
   determining the size independent double K fracture parameters of
   site-casting fully-graded hydraulic concrete. Different groups of
   fully-graded hydraulic concrete specimens with maximum aggregate size
   d_(max) = 150mm, one-time casting in the site of an actual super-high
   arch dam with its mixing tower system, were tested and analyzed. The
   double K fracture parameters, including initial fracture toughness
   K_(Ic)~(ini) and unstable fracture toughness K_(IC)~(un) were obtained.
   The effect of specimen size on double K fracture parameters was
   discussed. The research findings indicate that the minimum size for size
   independent double K fracture parameters ( K_(Ic)~(ini) and K_(IC)~(un))
   of the site-casting fully-graded hydraulic concrete should satisfy that
   ligament length H_2 is six times larger than the maximum aggregate size
   d_(max). The empirical formulas for size independent double K fracture
   parameters changing with the maximum aggregate size ( d_(max)) and the
   tensile strength (f_t) were obtained by analyzing experimental results.

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