Fractal characteristics of mesostructure and optimization of axial compression constitutive model of coal-fired slag concrete
Source abstract
Abstract
Abstract Coal-fired slag concrete (CSC) is widely used in underground engineering construction. In this study, axial compression tests on three CSC groups with varying slag–cement ratios (1, 1.5, and 2) were conducted using an RLJW-2000 rock mechanics test system to characterize the internal mesostructure of CSC quantitatively and establish the constitutive relationship of CSC. The relationship between the fractal dimension and compressive strength of the CSC was analyzed using scanning electron microscopy. The results showed that the compressive strengths of concrete with slag–cement ratios of 1, 1.5, and 2 were 27.3, 20.3, and 15.1 MPa, respectively, and the corresponding internal mesostructural dimensions were 1.837, 1.897, and 1.905, respectively. The compressive strength of CSC gradually decreased with an increasing slag–cement ratio. The fractal dimension described the microstructural development of the CSC and was negatively correlated with the compressive strength. The theoretical results obtained using the improved segmental CSC constitutive model were consistent with the experimental results, and the degree of fitting exceeded 0.99. These results form a theoretical basis for future studies on CSC.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Rock Mechanics and Modeling · Tailings Management and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (48)
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