Experimental study on the treatment of salt efflorescence on the wall of red sandstone in Arjai Grottoes based on the MICP technology
Arjai Grotto Temple is the largest and most completely preserved grotto temple complex in Inner Mongolia.It contains precious artistic information about history,religion,science and culture,and is known as"Dunhuang on the grassland".Due to the typical climatic characteristics of the local arid and cold regions,salt efflorescence has become one of the most serious diseases of grotto walls.At present,Arjai Grottoes are in the stage of protection,so it is particularly important to simulate and study the diseases indoors.In this study,the microbial induced calcium carbonate precipitation(MICP)technology was used to treat the salt efflorescence on the wall with weathered red sandstone soil as the matrix.The change of soil particle size before and after the disease was obtained by laser particle size analysis,and the physical indexes of plaster disruption height,powder volume and salt crust thickness were used to evaluate the degree of development of the disease.Based on the microbial mineralization technology,a mineralized film was generated to inhibit the disease.It is recommended to use the mineralized strain with a concentration of microbial liquid—OD600 greater than 1.5,which has the salt-tolerant performance.After the treatment,the height of plaster disruption decreased by more than 20％,the volume of powder decreased by more than 30％,and the thickness of salt crust decreased by more than 25％.We carried out experimental verifications and feasibility evaluations of the application of biomineralization technology to the treatment of salt efflorescence on the wall of red sandstone grottoes,the results of which could provide scientific pre-research on the promotion and application of green ecological and environmentally friendly technologies for rock wall restoration and reinforcement.
MICP technologyWeathered red sandstone soilSalt efflorescenceDisease simulation
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