Ion transport and crystallization in fired-clay brick: A NMR study
conference paper
Salts are widely recognized as a major cause of the loss of many historical objects,
such as masonry, statues, and other artwork. To obtain information about the
mechanisms underlying these damage processes we have studied the moisture and
ion transport within two types of fired-clay brick: a modern type produced in the
Netherlands and an old fired-clay brick from the city of Venice in ltaly
The time evolution of NaCl saturated samples of fired-clay brick during drying was
measured using Nuclear Magnetic Resonance. The moisture content and amount of
dissolved Na ions were measured quantitatively as a function of position. The NaCl
concentration profiles obtained from these data reflect the competition between
advection to the surface and redistribution by diffusion, For both types of brick, the
fast drying Dutch fired-clay brick and the slow drying Venice fired-clay brick, an
accumulation of NaCl at the drying surface is observed in the experiments.
such as masonry, statues, and other artwork. To obtain information about the
mechanisms underlying these damage processes we have studied the moisture and
ion transport within two types of fired-clay brick: a modern type produced in the
Netherlands and an old fired-clay brick from the city of Venice in ltaly
The time evolution of NaCl saturated samples of fired-clay brick during drying was
measured using Nuclear Magnetic Resonance. The moisture content and amount of
dissolved Na ions were measured quantitatively as a function of position. The NaCl
concentration profiles obtained from these data reflect the competition between
advection to the surface and redistribution by diffusion, For both types of brick, the
fast drying Dutch fired-clay brick and the slow drying Venice fired-clay brick, an
accumulation of NaCl at the drying surface is observed in the experiments.
Topics
TNO Identifier
330814
Source title
13th International Brick and Block Masonry Conference (IB2MaC), Amsterdam, Netherlands, 4-7 July
Pages
9 p.
Files
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