Distribution development of pore/crack expansion and particle structure of cemented solid-waste composites based on CT and 3D reconstruction techniques

Abstract

This work analyzes the effects of Industrial solid waste content and meso-microstructure on the mechanical and fracture behavior of cemented solid-waste composites (CSWC). The mechanical properties of CSWC were investigated using uniaxial compression tests. Quantitative analysis of pore and particle structure and cracks was performed using X-ray computed tomography (CT). In addition, the effects of solid waste content and porosity on the Uniaxial compressive strength (UCS) of CSWC were analyzed, and the effects of pore and steel slag (SS) particle distribution on crack expansion were investigated. The results show that the optimization of solid waste content can improve the pore structure of CSWC and promote the uniform distribution of SS particles within CSWC. SS content is 40 wt%, SS is the main factor affecting the strength of CSWC, SS content is less than 40 wt%, porosity and fly ash (FA) are the main factors affecting the strength of CSWC. Connected pores and microcracks are prone to develop as cracks under the action of external loads. Porosity is less than or equal to 0.10%, pore size is not related to crack development. SS content is greater than 10 wt%, particle structure affects crack development.