Department of Urban and Environmental Engineering (Urban Infrastructure Engineering)Since sulfur has fluidity only at specific temperature (over 115 ??C) and it is very sensitive to the temperature, it is necessary to quantitatively evaluate the workability of sulfur concrete. In this study, we considered the sulfur composite as a suspension of filler particles, which are the blends of cement and fly ash, and investigated the influence of filler properties on the rheology of the sulfur composite in paste level, which made of modified sulfur and fillers. The rheological properties of modified sulfur and sulfur composite are measured by parallel plates and the properties of filler particles were measured by laser diffraction. Bingham model to the selected shear strain rate showed better trends of rheological properties of sulfur composite. Yield stress of sulfur composites is mainly affected by the volume fraction of fillers and the type of fillers. Plastic viscosity is mainly affected by the surface area of fillers in sulfur composite. The rheological results and the Krieger-Dougherty model confirmed the intrinsic viscosity in the model equation is affected by the type of binder regardless of their volume fraction in sulfur composite. Consequently, the sulfur composite follows the suspension-rheology models when the proper content of filler was used, which is less than 30% in sulfur composite, and it implies the suspension theories can be applied to the materials based on the sulfur binder.clos
