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Information Journal Paper

Title

INVESTIGATION OF MICROBIAL PRECIPITATION OF CALCIUM CARBONATE IN REMEDIATION OF BUILDING STONE

Pages

  40-62

Abstract

 Preservation and remediation of historic buildings and building Stones have always been significant challenges for mining engineers. One of the useful methods to prevent stone decade is filling the pores using microbial induced calcium precipitation (as known bio-grouting). In this paper, the effects of different conditions on the optimal use of bio-grouting are investigated by performing Laboratory Tests. Unprocessed travertine samples with the same mineralogical and lithological conditions were selected. Experimental pattern with four variables (concentrations of calcium chloride and urea in cemention solution, pH of washing solution and ambient temperature) were designed to determine the wave velocity ratio (as a remediation sign) at samples. The input variables were selected in 5 levels using response surface designing method and 31 Laboratory Tests were performed. The results indicate that the use of equal concentrations of calcium chloride and urea (about 1 M) in the cementation solution is more effective for microbial precipitation. Adjusting the pH of the washing solution about 7 and the ambient temperature about 15 Celsius degrees will lead to optimal amount of calcium carbonate precipitatation, resulting in better Rock Remediation. Increasing the pH from 7 to 11, reduces the wave velocity ratio by 35% and decreasing the pH from 7 to 3 reduces the wave velocity ratio by 40%. Also, increasing and decreasing the ambient temperature from 15 to 30 and 15 to 0 Centigrade degrees, respectively, reduces the wave velocity ratio by 15%. The above results show that very acidic or alkaline environments and very cold or warm temperatures are not suitable for microbial precipitation operation and the effect of acidic rains on the degradation of remediating precipitations is more than alkaline rains.

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    APA: Copy

    Fayyazi, Aref, & Doostmohammadi, Ramin. (2022). INVESTIGATION OF MICROBIAL PRECIPITATION OF CALCIUM CARBONATE IN REMEDIATION OF BUILDING STONE. IRANIAN JOURNAL OF MINING ENGINEERING (IRJME), 17(54 ), 40-62. SID. https://sid.ir/paper/965659/en

    Vancouver: Copy

    Fayyazi Aref, Doostmohammadi Ramin. INVESTIGATION OF MICROBIAL PRECIPITATION OF CALCIUM CARBONATE IN REMEDIATION OF BUILDING STONE. IRANIAN JOURNAL OF MINING ENGINEERING (IRJME)[Internet]. 2022;17(54 ):40-62. Available from: https://sid.ir/paper/965659/en

    IEEE: Copy

    Aref Fayyazi, and Ramin Doostmohammadi, “INVESTIGATION OF MICROBIAL PRECIPITATION OF CALCIUM CARBONATE IN REMEDIATION OF BUILDING STONE,” IRANIAN JOURNAL OF MINING ENGINEERING (IRJME), vol. 17, no. 54 , pp. 40–62, 2022, [Online]. Available: https://sid.ir/paper/965659/en

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