The Role of Particle Size Distribution

While the addition of superplasticizers greatly improves concrete rheology through dispersion of the finer particles, the granular nature of concrete must not be overlooked.¹³  Concrete contains particles of different types, spanning several orders of magnitude is size ( ~50 nm for silica fume to ~50 mm for the largest aggregates). Thus, rheology may be improved by better grading and proportioning of the components.¹⁴, 15