A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Desalination of Cotta type Elbe sandstone with adapted poultices: Optimization of poultice mixtures
Cotta type Elbe sandstone has been frequently used as construction material and ornamental stone on buildings over centuries. Desalination of this sandstone (often performed with cellulose poultices in restoration practice) is ineffective in many cases due to its high amount of fine pores. A mixture of cellulose, kaolin and sand (1:2:1 by weight, CKS_121) with a high portion of fine pores was applied for poultice desalination on artificially salt-loaded specimens of Cotta type sandstone. Moreover, another mixture of the same components (CKS_128 with cellulose- kaolin-sand 1:2:8 by weight) and two poultices that are frequently used in restoration practice (ready-made Rajasil (RAJ) poultice and Arbocel® CC1000/ BWW40 (ARB) mixture) were applied for comparison. The pore size distributions and the structures of all poultices were characterized by MIP. The results showed highest amounts of extracted salt for the poultices with clay and higher portions of sand (CKS_128, RAJ). The CKS_121 poultice, although fitting best with regard to pore size distribution, shows high shrinkage due to the high amount of kaolin, which leads to loss of adhesion to the substrate during the desalination process. The results clearly demonstrate that in desalination practice of stones with fine pores compromises have to be found between the competitive parameters of “ideal” pore structure and low shrinkage of the poultice, both influenced by clay contents in the mixture.
Desalination of Cotta type Elbe sandstone with adapted poultices: Optimization of poultice mixtures
Cotta type Elbe sandstone has been frequently used as construction material and ornamental stone on buildings over centuries. Desalination of this sandstone (often performed with cellulose poultices in restoration practice) is ineffective in many cases due to its high amount of fine pores. A mixture of cellulose, kaolin and sand (1:2:1 by weight, CKS_121) with a high portion of fine pores was applied for poultice desalination on artificially salt-loaded specimens of Cotta type sandstone. Moreover, another mixture of the same components (CKS_128 with cellulose- kaolin-sand 1:2:8 by weight) and two poultices that are frequently used in restoration practice (ready-made Rajasil (RAJ) poultice and Arbocel® CC1000/ BWW40 (ARB) mixture) were applied for comparison. The pore size distributions and the structures of all poultices were characterized by MIP. The results showed highest amounts of extracted salt for the poultices with clay and higher portions of sand (CKS_128, RAJ). The CKS_121 poultice, although fitting best with regard to pore size distribution, shows high shrinkage due to the high amount of kaolin, which leads to loss of adhesion to the substrate during the desalination process. The results clearly demonstrate that in desalination practice of stones with fine pores compromises have to be found between the competitive parameters of “ideal” pore structure and low shrinkage of the poultice, both influenced by clay contents in the mixture.
Desalination of Cotta type Elbe sandstone with adapted poultices: Optimization of poultice mixtures
Maitschke, Julia (author) / Siedel, Heiner (author)
2017
11 pages , 592.17 KB
Miscellaneous
Electronic Resource
English
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