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Based on Bazant Scaling Law method, size effect formulas of single-K and double-K fracture toughness were derived to study the size effect of the fracture toughness of high strength fiber concrete. In non-geometric similarity condition, experimental study on fracture toughness
with several groups of steel fiber reinforced polymer high strength concrete was carried out and proved the size effect of the fracture toughness. Research results showed that double-K fracture toughness measured from small specimens had the following characteristics: (1) values of
double-K fracture toughness increased with specimen heights and approached plane strain fracture toughness KIC; (2) As initial crack length to specimen height ratio α0 (initial relative crack height) increased, the values of double-K
fracture toughness increased first and then decreased, and it reached the peak values while α0 equaled to 0.4. With size effect law derived in this paper, nominal double-K fracture toughness was quantitatively described and predicted, and a new double-K
fracture toughness criterion was established.
ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.