Abstract
This paper presents the results of center-point loading tests on thirty-six Recycled lump concrete (RLC) specimens made of high-strength Fresh concrete (FC) and normal-strength Demolished concrete lumps (DCLs). The effects of the characteristic size (50, 67, 100 or 133 mm) and shape (oblate, spherical or slender) of DCLs on the flexural behavior of RLC were investigated. And the Interfacial transition zones (ITZs) between FC and DCLs were tested using nanoindentation. Larger DCLs were found to produce lower RLC flexural strength. When lump size is invariant, oblate DCLs give the highest flexural strength and slender DCLs give the lowest strength. A formula was proposed to predict the variation in RLC flexural strength with lump size for different lump shapes. The quantitative relationship between RLC flexural strength and its compressive strength was established. In addition, the bonding between DCLs and FC is stronger when high-strength rather than normal-strength FC is used.
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