Multi-axial test and failure criterion analysis on self-compacting lightweight aggregate concrete

Abstract

Abstract In order to study the mechanical properties of self-compacting lightweight aggregate concrete under complex stress, experimental research on multi-axial stress behavior of self-compacting lightweight aggregate concrete were conducted by using a large general triaxial test machine. Through multi-axial tests, failure morphology and stress-strain curves of self-compacting lightweight aggregate concrete under different lateral stresses were obtained. By extracting the stress-strain curve eigenvalues (peak stress and peak strain) and analyzing the failure morphology, and citing the relevant literature to compare and analyze the conclusions of multi-axial research on ordinary concrete and lightweight aggregate concrete, the multi-axial stress characteristics and failure mechanism of self-compacting lightweight aggregate concrete were studied. The results show that when the uniaxial compression and lateral stress values of self-compacting lightweight aggregate concrete are small, the biaxial compression-pressure failure morphology mainly exhibits the shear failure morphology, which is different from that of ordinary concrete and lightweight aggregate concrete. At the same time, the influence of lateral stress on self-compacting lightweight aggregate concrete is obviously stronger than that of ordinary concrete and lightweight aggregate concrete. The failure criterion of self-compacting lightweight aggregate concrete based on Kupfer biaxial failure criterion and octahedral stress space has certain applicability. The content studied in this paper has theoretical significance for the engineering application development of self-compacting lightweight aggregate concrete.