Environmental Engineering Reference
In-Depth Information
Figure 11.16.
Left: SEM-BES backscatter electron picture - gypsum crystals
accumulated in the adobe pores; right: EDX-analysis of the crystals
A second alteration pattern can be identified. Under variation in temperature and
relative humidity, the varnish expands and contracts. These movements involve
flaking, with some paint layer loss (see Figure 11.24).
Figure 11.17.
SEM-BES backscatter electron pictures - varnish micro-cracking as a result of
expansion and contraction due to variation in temperature and relative humidity
11.2.4.
Conclusion
The bitumen plaster is an efficient outside protection, compatible with the mud
properties in terms of water vapor diffusion. It utilizes an easy conservation process
− in the application of an extra layer of bituminous paint. However, the mechanical
properties of the support should be taken into consideration.
It would be interesting to determine the long-term durability of the bitumen
plaster and identify how often extra paint should be applied. In this way, the quality
of the bituminous paint can be improved in terms of bitumen content, water content
and particle size.
