Effects of maximum aggregate size on fracture behaviors of self-compacting lightweight concrete

摘要

This study considers the influences of maximum aggregate size (d(max)) 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 d(max) = 9.5, 12.5 and 19 mm, 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 d(max) 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. (C) 2016 Elsevier Ltd. All rights reserved.