@misc{10481/74812,
year = {2022},
month = {3},
url = {http://hdl.handle.net/10481/74812},
abstract = {Significant progress in the understanding of the different degradation processes affecting building and ornamental
stone has taken place in recent decades. However, some weathering phenomena still are not fully understood,
which hampers the development of effective stone conservation treatments. One of these cases, stone
damage associated with the presence of swelling clays, is reviewed here. Swelling clays cause damage when
subjected to wetting/drying cycles, commonly resulting in stone scaling, flaking, spalling, exfoliation and/or
delamination. Examples of this damage process and the mechanisms proposed for its development, as well as the
key factors that control its origin, evolution and severity are presented and discussed. Alternative or complementary
processes that may also lead to stone damage due to expansion/contraction cycles are also discussed.
Finally, conservation treatments applied to halt or minimize clay swelling damage are reviewed. It is shown that
traditional conservation materials such as polymers and alkoxysilanes applied to protect and/or consolidate
damaged clay-containing stones typically have little effectiveness. Alternative treatments based on the application
of clay swelling inhibitors, and a novel green conservation approach based on bacterially-induced formation
of CaCO3 cement and associated production of exopolymeric substances, recently proposed to prevent/
control clay-related damage of tuff stone at the ancient Maya site of Copan, are presented and discussed.},
organization = {Spanish Government},
organization = {European Commission	RTI2018099565-B-I00},
organization = {Junta de Andalucia	RNM-179	
B-RNM-574-UGR20	
P20_00675},
organization = {University of Granada, Unidad Cientifica de Excelencia	UCE-PP2016-05	
Universidad de Granada/CBUA},
publisher = {Elsevier},
keywords = {Stone decay},
keywords = {Scaling},
keywords = {Clay swelling},
title = {Degradation and conservation of clay-containing stone: A review},
doi = {10.1016/j.conbuildmat.2022.127226},
author = {Elert, Kerstin and Rodríguez Navarro, Carlos Manuel},
}