Compressive test of the stochastic damage constitutive model of rubber particles self-compacting lightweight aggregate concrete in a strong-alkaline environment

Abstract

The paper proposes the optimal mix ratio of rubber particles self-compacting lightweight aggregate concrete after nine sets of experiments, and the block's 28-day compressive strength reaches 35Mpa; from the microscopic analysis of SEM electron microscope, it is concluded that a strong alkaline environment effectively activates the chemical activity of silica fume and fly ash. Promoting the growth of microcrystals in concrete and effectively improving the interface between materials, the cumulative damage curve calculated based on the Matlab fitting results shows that a strong alkaline environment can significantly reduce the variance of the damage probability of concrete with strain. Based on the damage constitutive model and the statistical analysis of the characteristic parameters of the actual stress-strain curve, a new segmented stochastic damage constitutive model of concrete is constructed, and the parameters of the new stochastic damage constitutive model are determined, which have better fitting results. Combining the stress characteristics of concrete under uniaxial compression and the stochastic damage evolution process, it provides a reference for the technology and application of fabricated building structures.