Enhanced consolidation efficacy and durability of highly porous calcareous building stones enabled by nanosilica-based treatments  

作　　者：CAO YiJian CAMAITI Mara ENDRIZZI Monica FORTI Giorgio VERGANI Ernesta FORTI Ilaria 

机构地区：[1]Institute of Culture and Heritage,Northwestern Polytechnical University,Xi’an 710072,China [2]CNR-Institute of Geosciences and Earth Resources,Florence 50121,Italy [3]Monica Endrizzi Conservative Art Restoration,Casale sul Sile-Treviso 31032,Italy [4]Forti Architecture Studio,Verona 37121,Italy [5]Ernesta Vergani Restoration of Works of Art,Volpago del Montello-Treviso 31040,Italy [6]Ernesta Vergani Restoration of Works of Art,Cannaregio 4056,Venezia 30121,Italy [7]UniversitàIUAV di Venezia,Venezia 30135,Italy

出　　处：《Science China(Technological Sciences)》2023年第8期2197-2212,共16页中国科学（技术科学英文版）

基　　金：supported by Provincia Veneta dell’Ordine dei Carmelitani Scalzi through the Special allocation grant(CNR-IGG Prot.N.0001882);the National Natural Science Foundation of China(Grant No.52202028);“the Belt and Road”Innovation Talent Exchange Program for Foreign Experts(Grant No.DL2021183001L)。

摘　　要：Outdoor building stones are suffering from serious degradation.To restore internal cohesion and to alleviate the disintegration of decayed stones,consolidation treatment is necessary and significant.Up to date,no fully satisfactory consolidation agent and its application methodology are available,mainly due to the limited penetration depth of consolidants,low compatibility,or poor durability in environmental conditions.Herein,in this study,aiming to design an effective and enduring method for the consolidation of highly porous calcareous stones,nanosilica-based consolidation treatments were tested and compared with traditional compounds(tetraethoxysilane,alkylalkoxysilane,barium hydroxide).In order to evaluate their performance and compatibility,a series of standard tests,including the Drilling Resistance Measurement System(DRMS)test,surface color measurement,vapor diffusivity measurement,and peeling test,were carried out.Besides,the penetration depth and distribution profiles of consolidants were estimated by exploiting elemental raster scanning of SEM-EDS analysis performed throughout the thickness of samples.More importantly,by employing a climatic chamber,the artificial ageing test was also conducted by simulating harsh atmospheric conditions.After accelerated ageing,the performance of all consolidants was assessed again.Results demonstrated that the application of nanosilica(<10 nm in dimension)by cellulose poultice,followed by adding tetraethoxysilane with the classical method“wet on wet”,is the best consolidation approach,in terms of in-depth consolidation efficacy,compatibility with the stone substrate,surface cohesion strength and performance durability in environmental conditions.Moreover,the treated surface is not hydrophobic,which allows further grouting and adhesion operations usually required for the restoration of historic buildings.

关 键 词：stone consolidation NANOSILICA tetraethoxysilane penetration depth DURABILITY 

分 类 号：TQ127.2[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程] TU521.2[建筑科学—建筑技术科学]