Two hugely different mortar beams with the volume ratio close to 1:1000 were tested under three-point-bending (3-p-b) to verify fracture predictions for the large and long (LL) structures from results of the small and short (SS) specimens. They differed by both size and geometry: SS specimens with span length S=0.1m, width W=40mm and S/W=2.5, and LL beams with S=2m, W=500mm and S/W=4. This study performed and analysed quasi-brittle fracture of 0.1m SS specimens with initial notch a0 from 1 to 25mm for determination of tensile strength ft and fracture toughness KIC, from which fracture of 2m LL beams with a0 of 250mm was accurately predicted. Experiment results from the two vastly different 3-p-b beams, highly heterogeneous SS and nearly homogeneous LL in comparison to aggregates, were analysed by the boundary effect model (BEM).
Materials & design – Elsevier
Published: Nov 5, 2017
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