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This study discusses experimentally the relationship between the major nine parameters used for fractography of concrete and the mechanical properties of the specimens. The authors employed 18 types of specimens made of different mix proportions of concrete with a different maximum size, a different quantity, a different fineness modulus and the brand of aggregates, but the water-to-cement ratio is about the same. They include not only monolithic specimens made of cement paste or mortar, but also jointed specimens with placing joint at the center. The authors obtained mechanical properties and fractographic parameters with testing and analyzing such various types of concrete specimens. The findings are as follows: 1. The nine fractographic parameters are closely related to each other reflecting the extent of crack paths and the depth of fracture process zone, though they have the different viewpoints with focusing on the extreme points (i.e., the height or its derivatives), the increase of the length or the area from the projected ones, or the local curvature. 2. The most consistent fractographic parameter to the mechanical properties is RS (the ratio of the fractured surface to the projected one) among the parameters analyzed in this study, which is considered to be the results of the extent of crack paths and the depth of fracture process zone. Other 8 parameters are closely related parameters to RS.

EXPERIMENTAL STUDY ON MAJOR PARAMETERS OF FRACTOGRAPHY FOR CONCRETE