Abstract
This paper experimentally investigated the compressive strength-porosity and compressive strength-bulk density dependence of ceramic foams fabricated using coal bottom ash (CBA), bauxite residue, and low-grade albite. The compressive stress-strain curves of ceramic foams with different bulk densities under pressure were compared to reveal the difference of their fracture mechanisms. The compressive strength-porosity trend of CBA foamed ceramics with a porosity range of 68-87% complied with the Rice model and could be expressed by an exponential equation σf=53852.28×exp-0.105P. However, for the porosity levels exceeding 90%, a linear equation σf=54.33-0.57P was provided the most accurate data fitting. The compressive strength-bulk density dependence of ceramic foams also satisfied the Gibson-Ashby model expressed by σf=73.54ρ∗3/2-26.64ρ∗. Finally, the variation of fracture mechanisms of compressed ceramic foams with their bulk density was revealed. Under one-dimensional compression stress, low-density ceramic foams (ρ ≤ 0.40 g/cm3) underwent plastic-like deformation, while high-density ones (ρ ≥ 0.60 g/cm3) exhibited brittle fracture behavior.
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