Rheological Characteristics Study of Ultra-tough Slag-Sugarcane Bagasse Ash Based Geopolymer Composite Materials
LI Jing1,2,*, JIAO Zhisen1, ZHANG Ling1, HUANG Ying1,2, CHEN Zheng1,2
1 School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2 State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China
Abstract: Engineered geopolymer composites (EGC) are regarded as ideal materials for the repair and modification of various infrastructures due to their excellent mechanical and erosion-resistant properties. However, the instability of workability significantly limits their promotion and application in the engineering field. Therefore, in this paper, from the composition of EGC raw materials, the effects of key compositional parameters, such as sugarcane bagasse ash, fibers, water-to-cement ratio, and alkali equivalents, on its rheological properties and fluidity were investigated with a view to achieving the evaluation of the construction performance of EGC based on the raw material proportioning parameters. The applicability of the Bingham and Modified Bingham models in fitting the rheological curves of EGC was also analyzed. The results indicate that the Modified Bingham model is more suitable for describing the rheological properties of EGC slurry. Increasing the sugarcane bagasse ash content enhances the plastic viscosity, yield stress, and flowability of the slurry. An increase in fiber content raises both the plastic viscosity and yield stress while reducing flowability. An increase in the water-to-binder ratio decreases the plastic viscosity and increases flowability. An increase in alkali equivalent increases the plastic viscosity, decreases the yield stress, and results in a trend where flowability first increases and then decreases. The relationship between the rheological parameters and flowability of EGC slurry is expressed as D=30.30-0.07τ0-3.32μ. Additionally, a flowability prediction model for EGC based on raw material composition parameters is established.
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2026, Vol. 40 
