Conventional Triaxial Compressive Mechanical Properties of Foamed Lightweight Concrete

doi:10.16552/j.cnki.issn1001-1625.2025.0258

Abstract

Abstract: This study investigated the stress-strain curves, failure modes, and shear strength characteristics of foamed lightweight concrete under different confining pressure levels through conventional triaxial compression tests. The results show that the triaxial compressive strength significantly increases with the increase of confining pressure level, but the growth rate slows down with the increase of confining pressure level. Within the confining pressure level range of 0.1 to 0.5, the conventional triaxial compressive strength increases by 1.5 times to 2.5 times relative to the uniaxial compressive strength. Lateral pressure has a significant impact on the failure mode of the specimens. Without confining pressure, a triangular constrained area is formed at the end of the specimen and diagonal cracks occur. With confining pressure, shear failure is the main manifestation. Under high confining pressure, the fracture area of the specimen is difficult to expand laterally, the main crack width is reduced, and the extrusion plastic flow occurs, resulting in large plastic deformation. Analysis using the Mohr-Coulomb criterion reveals that the cohesion and internal friction angle of foamed lightweight concrete are positively correlated with wet density, and the cohesion is approximately linearly related to porosity. These research findings provide a theoretical basis and technical support for the application of foamed lightweight concrete under complex stress states.

Key words: foamed lightweight concrete, triaxial compression test, failure mode, wet density, confining pressure level, shear strength characteristic

CLC Number:

U414

YANG Qingyuan, WANG Yao, SHAN Hongri, LI Hui, CHEN Cong, JIANG Nengdong. Conventional Triaxial Compressive Mechanical Properties of Foamed Lightweight Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3246-3254.

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