Mode II fracture of cementitious materials-Part V~+: Size effect on fracture toughness, shear strength and slip of cement mortar and concrete reinforced with and without fibers

摘要

The paper presents the results of an experimental investigation on the effect of size of test specimen on Mode-II fracture, shear strength and slip of cement mortar and concrete reinforced with and without short steel fibers. Tests have been conducted using DCN-specimen~1, to obtain predominant Mode-H fracture. In this study, four different sizes of the specimen of one notch-depth ratio of 1:2 mortar and 1:2:4 concrete were tested. Tests were also done on these mortar and concrete mixes reinforced with 1 percent randomly distributed short steel fibers. Crack patterns and load-displacement plots are given. Effect of size of the specimen on fracture toughness and shear stresses at cracking and ultimate has been examined. Bilinear and trilinear idealisations of shear stress-slip plots for mixes without and with fibers are presented.