Calcium Carbonate Bio-Deposition Technique by Using Fine Waste Mortar Particles as Bacteria-Immobilization Medium

Abstract:

A new immobilization technique that encapsulates B. pasteurii in the fine waste cement mortar particles (FWM) was being investigated to induce CaCO₃ precipitation in reducing porosity and refining pore size of old cement mortar (OCM), where FWM particles were crushed from old cement concrete and passed through a size of 5 mm sieve. The capillary water absorption test (CWA) and scanning electron microscopy (SEM) were carried out to evaluate the pore-refining effect of this bio-treated methods. X-ray diffraction analysis (XRD) was used to analyze the morphology and the composition of the treated OCM. The results showed that a larger quantity of calcium carbonate bio-depositions were formed and filled the pores of OCM. As a result, the capillary water absorption was decreased by 47% compared with untreated-OCM, respectively.

• Periodical: Key Engineering Materials (Volume 633)
• Pages: 149-153
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.633.149
• Online since: November 2014
• Authors: Geng Ying Li*, Zhong Yao Pan, Yu Yu, Hui Ling Kuang, Fo Xiong Feng, Dong Ming Liu
• Keywords: Capillary Water Absorption, Microbial Induced Calcium Carbonate Deposition, Microstructure, Pore-Refining Effect

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