| Popis: |
Moisture in porous building materials can give rise to several kinds of damages, e.g., frost damage, salt crystallisation, and mould growth. Therefore a detailed knowledge of the moisture transport is essential for understanding the durability of these materials. In masonry brick and mortar are bonded. For studies of the moisture transport across the brick/mortar interface it is important to measure the dynamic moisture profiles quantitatively. Nuclear magnetic resonance (NMR) offers a powerful technique to measure these profiles. However, fired-clay brick and mortar contain large amounts of paramagnetic ions, which complicates the NMR measurements. Therefore the moisture transport was studied using a specially developed NMR scanner. With this instrument the moisture profiles can be measured with an accuracy of 1 % and a spatial resolution of 1 mm. |
