The microscopic failure mechanism and energy evolution law of foamed concrete under uniaxial compression

Abstract

This paper uses the macroscopic stress–strain curve of foamed concrete under uniaxial compression as a baseline reference, combining the micro-failure mechanisms of the internal structure and the laws of energy evolution to explain the macroscopic mechanical behavior. This study proposes the mechanisms behind pore fracture and recombination, as well as the mechanical interactions within thin-walled structures. The fractured structure swiftly fills and restores the framework, while the reticulated thin-walled structure adjusts transmission pathways for forces, inducing dormant elastic strain energy and thereby prolonging the interval of residual strain. Coupled with macroscopic laws dictating energy evolution, this paper elaborates on the influence of microscopic structures on stress–strain characteristics. The capacity of foam concrete to proficiently absorb and dissipate external energy, thereby extending the duration of the strain process, and its potential as a buffering material are substantiated.