Abstract
The size distribution and spatial dispersion of Portland cement particles in the fresh state have a significant influence on hydration, microstructure development and ultimate properties of cement-based materials. The relationship between size distribution of Portland cement particles (PSD) and the spatial dispersion of cement particles is quantitatively studied in an analytical approach and verified by computer simulation. The mean free spacing λ and the mean nearest neighbour distance Δ 3 between cement particles are adopted to represent the spatial dispersion of the cement (or aggregate) particles in model cement (or model concrete). This quantitative relationship is discussed for four kinds of particle size distributions, i.e. . Rosin-Rammler distribution (widely used for cement particles), Fuller distribution (generally accepted for aggregates), equal volume fraction and equal number fraction mixtures. The influence is studied of microstructure of model cement on the depercolation threshold of the pore phase. The mean free spacing λ can be estimated from the particle size distribution function and can offer insight into the morphological evolution and the depercolation threshold of pore structure in cement.
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