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Effects of carbonation on the pore structure of non-hydraulic lime mortars


Reference:

Lawrence, R. M. H., Mays, T., Rigby, S., Walker, P. and D'Ayala, D., 2007. Effects of carbonation on the pore structure of non-hydraulic lime mortars. Cement and Concrete Research, 37 (7), pp. 1059-1069.

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Official URL:

http://dx.doi.org/10.1016/j.cemconres.2007.04.011

Abstract

The pore structures of carbonated non-hydraulic lime mortars made with a range of different aggregates and concentrations of lime have been determined using mercury intrusion porosimetry (MIP). MIP data have been correlated with scanning electron microscopy images and other porosity data. During carbonation there is an increase in pore volume in the ~0.1 μm pore diameter range across all mortar types which is attributed to the transformation of portlandite to calcite. Also there is a monotonic increase in the volumes of pores with diameters below 0.03 μm. A model is proposed for the changes in pore structure caused by carbonation. This attributes the increase in the volume of sub 0.03 μm pores to the attachment of calcite crystals to the surface of aggregate particles, and in some cases to the surface of portlandite crystals. This phenomenon may explain the continuing presence of portlandite in mortars that, apparently, have fully carbonated.

Details

Item Type Articles
CreatorsLawrence, R. M. H., Mays, T., Rigby, S., Walker, P. and D'Ayala, D.
DOI10.1016/j.cemconres.2007.04.011
DepartmentsFaculty of Engineering & Design > Chemical Engineering
Faculty of Engineering & Design > Architecture & Civil Engineering
RefereedYes
StatusPublished
ID Code503

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