Abstract
Solvent exchange has been proposed as a suitable method to dry cement paste samples for pore structure analysis and to simultaneously yield diffusion coefficients. The success of this depends on the solvent exchange process being one of simple counter diffusion. GGBS/OPC grouts have been immersed in both methanol and propan-2-ol and weight loss and length change data collected. Pore size distributions have been determined using a comparative solvent adsorption technique. The results suggest that the exchange process generates vacated pore space yielding anomalous weight and length changes to preclude the determination of diffusion coefficients. The degree of this behaviour is a function of GGBS/OPC ratio, curing and solvent. It is likely that solvent exchange alters the microstructure of the grouts such that unique representations of the pore structure are unobtainable.
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