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'Microbial mortar'- restoration of degraded marble structures with microbially induced carbonate precipitation

Minto, James M. and Tan, Qian and Lunn, Rebecca J. and El Mountassir, Grainne and Guo, Hongxian and Cheng, Xiaohui (2018) 'Microbial mortar'- restoration of degraded marble structures with microbially induced carbonate precipitation. Construction and Building Materials, 180. pp. 44-54. ISSN 0950-0618

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    Abstract

    To evaluate a restoration strategy for highly degraded marble structures, microbially induced carbonate precipitation (MICP) has been employed to reduce porosity and permeability in a column filled with coarse crushed marble. A 3D X-ray tomography scan revealed the spatial variation in porosity throughout the column and tracer breakthrough curves, recorded at intervals during treatment, enabled derivation of core-scale fluid transport properties and their alteration by precipitating carbonate. Micro-continuum scale flow modelling based on the X-ray data indicated that treatment led to changes in the pore network structure with flow increasingly focused into a smaller number of faster flowing open channels.