A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Highlights Size and shape of demolished concrete lumps (DCLs) are defined. Compressive performance of specimens containing oblate DCLs is relatively weak. Compressive behaviors of specimens with slender and spherical DCLs are similar. Characteristic size of DCLs has little effect on compressive strength of specimens. Oblate DCLs bond to FC less strongly.
Abstract Previous research on the mechanical behavior of compound concrete (CC), which is made of demolished concrete lumps (DCLs) and fresh concrete (FC), has focused on the CC made with roughly spherical DCLs with specified sizes. Limited knowledge is available about the effects of size and shape of DCLs on the compressive behavior of CC, especially when high-strength FC is used. This study investigated the compressive behavior of CC containing DCLs with various characteristic sizes (50, 67, 100 and 133 mm) and shapes (oblate, spherical and slender). And the interfacial transition zones (ITZs) between FC and DCLs with different sizes and shapes were observed using scanning electron microscope (SEM). Laboratory compression tests show that the characteristic size of DCLs has little effect on the compressive strength or elastic modulus of CC made with high-strength FC. For a given lump size, the compressive strength is similar when slender or spherical DCLs are included, but oblate lumps give a compressive strength 10% lower. When the compressive stress exceeds 40% of the CC’s compressive strength, there is greater lateral deformation of specimens made with oblate DCLs compared with spherical or slender DCLs at a lump size of 133 mm. In addition, oblate DCLs bond to FC less strongly.
Highlights Size and shape of demolished concrete lumps (DCLs) are defined. Compressive performance of specimens containing oblate DCLs is relatively weak. Compressive behaviors of specimens with slender and spherical DCLs are similar. Characteristic size of DCLs has little effect on compressive strength of specimens. Oblate DCLs bond to FC less strongly.
Abstract Previous research on the mechanical behavior of compound concrete (CC), which is made of demolished concrete lumps (DCLs) and fresh concrete (FC), has focused on the CC made with roughly spherical DCLs with specified sizes. Limited knowledge is available about the effects of size and shape of DCLs on the compressive behavior of CC, especially when high-strength FC is used. This study investigated the compressive behavior of CC containing DCLs with various characteristic sizes (50, 67, 100 and 133 mm) and shapes (oblate, spherical and slender). And the interfacial transition zones (ITZs) between FC and DCLs with different sizes and shapes were observed using scanning electron microscope (SEM). Laboratory compression tests show that the characteristic size of DCLs has little effect on the compressive strength or elastic modulus of CC made with high-strength FC. For a given lump size, the compressive strength is similar when slender or spherical DCLs are included, but oblate lumps give a compressive strength 10% lower. When the compressive stress exceeds 40% of the CC’s compressive strength, there is greater lateral deformation of specimens made with oblate DCLs compared with spherical or slender DCLs at a lump size of 133 mm. In addition, oblate DCLs bond to FC less strongly.
Influences of size and shape of demolished concrete lumps on compressive behavior of compound concrete
2020-10-10
Article (Journal)
Electronic Resource
English
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