Biocarbonation of reactive magnesia based on microbially induced carbonate precipitation(MICP)process is a sustainable geotechnical reinforcement technology for strength development and permeability reduction.This met...Biocarbonation of reactive magnesia based on microbially induced carbonate precipitation(MICP)process is a sustainable geotechnical reinforcement technology for strength development and permeability reduction.This method can be used to produce microbial restoration mortar(MRM)for the application of stone cultural relics restoration.In this paper,the influence of particle size distribution on the strength and porosity of MRM was examined.By mixing fine and coarse sandstone powder in various proportions,nine different particle size distributions were obtained to investigate the restoration performance,including the unconfined compressive strength(UCS),porosity,and color difference.The results indicate that the well-graded particle size distribution can lead to the UCS improvement and porosity reduction of MRM.The findings also imply that adding fine sandstone powder to the coarse sandstone powder can provide extra bridging contacts within the soil matrix.These bridging contacts can be easily connected by the precipitated hydrated magnesium carbonates(HMCs)minerals,consequently resulting in more effective bonding and filling within the pore matrix.The microstructural images of MRM confirm the formation of HMCs,which exhibited a dense network structure,filling out the gap and bonding the sandstone powders.Furthermore,the microbial restoration mortar showed a high weather resistance to dry-wet cycles,acid rain,and salt attack,which is attributed to better stability and strength of HMCs than the original calcic cemented minerals in sandstone.展开更多
Post WWⅡ reconstruction took place at a time of fundamental importance for our understanding of the divide,theoretical and technical,between consolidation,reconstruction and restoration.Indeed,this period represents ...Post WWⅡ reconstruction took place at a time of fundamental importance for our understanding of the divide,theoretical and technical,between consolidation,reconstruction and restoration.Indeed,this period represents the moment in which the earliest stages of this rift emerged.In this essay,we shall attempt to provide an account of this phenomenon by citing case studies considered important within the Italian and German context:post-WWⅡ reconstruction work in the Veneto region(at key sites such as the Basilica Palladiana in Vicenza,the Palazzo dei Trecento in Treviso and the Church of the Eremitani in Padua),reconstruction of the Alte Pinakothek in Munich,and reconstruction and work for new use of the hospital,Ospedale Maggiore,in Milan,as a seat for the Università Statale.Considering these instances provides us with an opportunity to reconsider the transition,theoretical and technical,between conservation of ruins and reconstruction of memory.展开更多
Since the establishment of treaty ports in the mid-19th century,the urban development of many Chinese cities,and notably of Shanghai,has been heavily influenced by global economic flows and global urban and architectu...Since the establishment of treaty ports in the mid-19th century,the urban development of many Chinese cities,and notably of Shanghai,has been heavily influenced by global economic flows and global urban and architectural practices.In Shanghai,extensive lilong neighbourhoods stand as remnants of the treaty port era.Many of these historic districts are in close proximity to rapidly transforming areas of the city,creating civic tension around demolition,conservation and the redevelopment of colonial heritage.Examining the listed Bugaoli community in Shanghai’s old French Concession,the heritage strategies applied under the particular Cultural Relics Protection System(CRPS),and the discourse of local residents interviewed in the context of this project,this paper reveals the paradoxes around urban heritage conservation and urban development by considering three different temporalities:legislative time,economic time and citizen time.The paper argues that actors involved in heritage practices should consider both space and time related issues in urban heritage conservation.Historic communities such as Bugaoli experience conflicts between conservation and the demands of everyday life.They underline and require a heritage strategy that acknowledges diverse temporalities and balances legal norms,economic interests and the public’s demands.展开更多
基金supported by Chongqing Research Institute Performance Incentive and Guidance Project(Grant No.cstc2021jxjl00028)Entrepreneurship and Innovation Support for Overseas Student,Chongqing,China(Grant No.CX2022007)Chongqing Municipal Special Project for Technological Innovation and Development Application(Grant No.JG2021072).
文摘Biocarbonation of reactive magnesia based on microbially induced carbonate precipitation(MICP)process is a sustainable geotechnical reinforcement technology for strength development and permeability reduction.This method can be used to produce microbial restoration mortar(MRM)for the application of stone cultural relics restoration.In this paper,the influence of particle size distribution on the strength and porosity of MRM was examined.By mixing fine and coarse sandstone powder in various proportions,nine different particle size distributions were obtained to investigate the restoration performance,including the unconfined compressive strength(UCS),porosity,and color difference.The results indicate that the well-graded particle size distribution can lead to the UCS improvement and porosity reduction of MRM.The findings also imply that adding fine sandstone powder to the coarse sandstone powder can provide extra bridging contacts within the soil matrix.These bridging contacts can be easily connected by the precipitated hydrated magnesium carbonates(HMCs)minerals,consequently resulting in more effective bonding and filling within the pore matrix.The microstructural images of MRM confirm the formation of HMCs,which exhibited a dense network structure,filling out the gap and bonding the sandstone powders.Furthermore,the microbial restoration mortar showed a high weather resistance to dry-wet cycles,acid rain,and salt attack,which is attributed to better stability and strength of HMCs than the original calcic cemented minerals in sandstone.
文摘Post WWⅡ reconstruction took place at a time of fundamental importance for our understanding of the divide,theoretical and technical,between consolidation,reconstruction and restoration.Indeed,this period represents the moment in which the earliest stages of this rift emerged.In this essay,we shall attempt to provide an account of this phenomenon by citing case studies considered important within the Italian and German context:post-WWⅡ reconstruction work in the Veneto region(at key sites such as the Basilica Palladiana in Vicenza,the Palazzo dei Trecento in Treviso and the Church of the Eremitani in Padua),reconstruction of the Alte Pinakothek in Munich,and reconstruction and work for new use of the hospital,Ospedale Maggiore,in Milan,as a seat for the Università Statale.Considering these instances provides us with an opportunity to reconsider the transition,theoretical and technical,between conservation of ruins and reconstruction of memory.
文摘Since the establishment of treaty ports in the mid-19th century,the urban development of many Chinese cities,and notably of Shanghai,has been heavily influenced by global economic flows and global urban and architectural practices.In Shanghai,extensive lilong neighbourhoods stand as remnants of the treaty port era.Many of these historic districts are in close proximity to rapidly transforming areas of the city,creating civic tension around demolition,conservation and the redevelopment of colonial heritage.Examining the listed Bugaoli community in Shanghai’s old French Concession,the heritage strategies applied under the particular Cultural Relics Protection System(CRPS),and the discourse of local residents interviewed in the context of this project,this paper reveals the paradoxes around urban heritage conservation and urban development by considering three different temporalities:legislative time,economic time and citizen time.The paper argues that actors involved in heritage practices should consider both space and time related issues in urban heritage conservation.Historic communities such as Bugaoli experience conflicts between conservation and the demands of everyday life.They underline and require a heritage strategy that acknowledges diverse temporalities and balances legal norms,economic interests and the public’s demands.
