A simple empirical fitting form (Equation 2) was suggested that accurately fits experimentally measured sorption data for a variety of mortars and concrete which assumes that pores at two different length scales control the sorption. The anomalous time behavior suggested in some earlier sorption studies may be the result of not taking into account surface effects when the sample is initially exposed to water and the fact that smaller pores probably control capillary suction at longer times. While it is difficult to precisely predict long term trends from measurements taken over very short periods, our data suggests very good estimates, for an exposure period of approximately a year, may be obtained by examining the initial uptake over a period of 10 to 20 days by using Equation 2.
Future studies include the role saturation plays in sorption, the continuation of sorption measurements to check longer time behavior, and the examination of how other transport properties correlate with sorption.