Abstract
This study considers the influences of maximum aggregate size (dmax) on fracture parameters and brittleness of self-compacting lightweight concrete. A series of three point bending tests were carried out on 84 notched beams with different sizes. Six compositions with dmax=9.5, 12.5 and 19mm, and water/cement ratios of 0.35 and 0.4 were considered. In each mix, the parameters were analyzed by size effect method. The results indicated that as dmax increased, the fracture toughness and energy increased, which may be explained by changes in fractal dimensions. Moreover, the ductility, measured by means of effective length of fracture process zone, increased.
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