Dissolution effects on specific surface area, particle size, and porosity of Pentelic marble

Dissolution of natural stone such as marble is not limited to its surface. The porous structure, known to play an important role in stone decay, is al so affected by the conditions of dissolution. In the present work, the chan ges in pore size distribution of Pentelic marble particles accompanying che mical dissolution in undersaturated solutions and at alkaline pH 8.25 were investigated. The specific surface area and the mesopore distribution of th e Pentelic marble tested showed a pronounced decrease to very low values. O n the other hand, the sizes of macropores exhibited a tendency to increase with the extent of dissolution due either to dissolution in the interior of the pores or to fusion of small pores into larger. Furthermore, the number of small particles decreased significantly, reaching complete disappearanc e, depending on the extent of dissolution. At the same time, the relative n umber of particles of intermediate size increased. (C) 2001 Academic Press.