In the past few decades, concrete technologists have focussed their attentions towards the internal microstructure of cement based materials. The microstructure generally governs the strength and durability of cement based materials. The pore size characteristics of the porous materials are represented by pore size distribution either in the form of cumulative pore size distribution or differential pore size distribution. In this study, the compressive strength, permeability and hydraulic diffusivity have been estimated by using Mercury Intrusion Porosimetry (MIP) results. For this purpose, concrete specimens were crushed and the broken chunks with aggregates were collected from different mixes such as Portland cement (PC) mix, PC with silica fume (5%, 10% and 15% replacement) mixes, and PC with Ground granulated blast furnace slag (GGBS) (10%, 30% and 50% replacement) mixes. The concrete specimens were tested at 1, 3, 7, 28, 42 and 90 days of curing. From the cumulative intruded volume versus pressure data, the experimental pore size distribution (PSD) parameters such as mean distribution radius (r0.5), dispersion coefficient (d) and permeable porosity (P) were calculated. The estimated PSD parameters were used to estimate the compressive strength, permeability and hydraulic diffusivity through the readily available relationships for compressive strength, permeability and hydraulic diffusivity.
The mean distribution radius decreases with increase in curing ages in all mixes. In addition to this, the dispersion coefficient also increases with increase in curing ages in all mixes. The compressive strength of concrete mixes can be obtained through the mean distribution radius and permeable porosity. The estimated permeability increases with increase in w/c ratio while the hydraulic diffusivity versus relative moisture content in both wetting and drying cases exhibits similar trend as reported in the literature.