Abstract
The Sun Wu tomb in Shangfang Town,Nanjing City is a brick tomb of the Six Dynasties in China,which is very famous for its big scale and complex structure.After being excavated in 2005, microbiological damage occurred on the interior wall of tomb chambers due to the fluctuation of environmental factors, which threatens the historic and culrutal value of this building heritage. Microbiological damage is highly related to the high temperature, high humidity in the tomb chamber and condensation on the wall surface. To solve the problem of microbiological damage in the Sun Wu tomb, the environment monitoring was carried out and the current protection shed on the Sun Wu tomb was optimized. the heat and moisture transfer numerical simulation model of the protection shed was built to evaluate the effects of the optimized protection shed for reducing the condensation on the wall surface.The results show that and add of an functional space into the protection scheme can reduce the condensation on the wall surface of the site.In the protection of masonry archaeological sites, design of such functional space can reduce the condensation on the wall surface of the site,so as to control the microbiological damage in the site.
Highlights
Introduction of the SunWu tomb in Shangfang, NanjingThe Sun Wu tomb is located in Dongshan street,Shangfang town,Jiangning district, Nanjing city
The outdoor environment monitoring around the Sun Wu tomb was conducted from July 20th,2015 to June 20th, 2017.Monitoring mainly included three parts: outdoor environmental meteorological parameters, including temperature, humidity, solar radiation, wind speed, wind direction, etc.;indoor environmental parameters of protection shed, including temperature and humidity;temperature and humidity in the tomb chamber.In addition, the height of the underground water level was monitored
Is thermal conductivity [W/mK], ψ is volumetric moisture content (m3 / m3),μ is water chemical potential (J/kg); RV is the universal gas constant for water vapor (Pam3/kmolK); H is relative humidity (%),qs is heat flow density (W/m2),J1w(s) and J2w(s) are gaseous water and liquid water, λ'μg and λ'μl are moisture conductivity related to water chemical potential gradient [kg/ms (J/kg)], λ'Tg and λ'Tl is moisture conductivity related to temperature gradient [kg/msK]
Summary
Due to the influence of high humidity environment, mould growth on the surface of the brick is obvious. There are a lot of mould on the wall of both front and back tomb. Https://doi.org/10.10 51/matecconf /201928202096 chamber.Under the action of microbiological corrosion, the inscriptions on the surface of the brick are obviously blurred or disappeared. The mould mainly grows on the surface of the lower part of the wall in the tomb, which is near the ground.The phenomenon is related to seepage of ground water and condensation on the wall in the tomb
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