scholarly journals Complete Genome and Calcium Carbonate Precipitation of Alkaliphilic Bacillus sp. AK13 for Self-Healing Concrete

2020 ◽  
Vol 30 (3) ◽  
pp. 404-416 ◽  
Author(s):  
Yoonhee Jung ◽  
Wonjae Kim ◽  
Wook Kim ◽  
Woojun Park
Keyword(s):  
Calcium Carbonate ◽  
Complete Genome ◽  
Carbonate Precipitation ◽  
Self Healing ◽  
Bacillus Sp ◽  
Calcium Carbonate Precipitation ◽  
Alkaliphilic Bacillus

scholarly journals An experimental approach to microbial carbonate precipitation in improving the engineering properties of sandy soils

2021 ◽  
Vol 71 (1) ◽  
Author(s):  
Baki Bagriacik ◽  
Zahraddeen Kabir Sani ◽  
Fatima Masume Uslu ◽  
Esra Sunduz Yigittekin ◽  
Sadik Dincer
Keyword(s):  
Calcium Carbonate ◽  
Soil Stabilization ◽  
Soil Improvement ◽  
Engineering Properties ◽  
Carbonate Precipitation ◽  
Bacillus Sp ◽  
Calcium Carbonate Precipitation ◽  
Weak Soil ◽  
Direct Shear Tests ◽  
Microbial Carbonate Precipitation

Abstract Purpose Stabilization of weak soil can be achieved through different methods, some of which include jet column, cement stabilization and fly ash stabilization. Unfortunately, the use of the aforementioned methods of soil improvement affects the environment negatively thereby leading to environmental degradation. With the aforesaid impediment in mind, the need for devising methods of weak soil improvement becomes pertinent. Methods Bacillus sp. — a non-pathogenic organism found abundantly in soil — was investigated in this study as a potential agent of soil improvement. The usability of Bacillus sp. in soil improvement was investigated with direct shear tests and permeability tests under optimum conditions in this study. Result Time-dependent study on the effect of the ureolytic bacteria Bacillus sp.-induced calcium carbonate precipitation shows reduction in permeability and increase in the strength of the soil under study. On exhaustion of the available nutrients in the soil, however, the strength of the soil is not negatively impacted. Conclusion Microbially induced calcium precipitation by Bacillus sp. is effective in soil improvement as such it may serve as substitute for conventional soil stabilization techniques. The ability of the bacteria to precipitate calcium carbonate in the soil leads to reduction in the permeability and increase in the shear strength of the soil.

scholarly journals Selection of bacteria inducing calcium carbonate precipitation for self-healing concrete application

2019 ◽  
Vol 1 (1) ◽  
pp. 26-30
Author(s):  
Ridwan Syarif ◽  
◽  
Intan Nurul Rizki ◽  
Ridho Kresna Wattimena ◽  
Siti Khodijah Chaerun ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Optimum Condition ◽  
Nutrient Broth ◽  
Calcium Lactate ◽  
Carbonate Precipitation ◽  
Self Healing ◽  
Optimum Growth ◽  
Calcium Carbonate Precipitation ◽  
Growth Ph ◽  
Selection Of

A modification of bacterial medium using calcium lactate pentahydrate was developed for calcium carbonate precipitation. A total of five strains of bacteria were cultivated on the solution medium containing nutrient broth and calcium lactate pentahydrate. In this study, the variation of 3.2 mM and 16.2 mM of calcium lactate pentahydrate was used to obtain the optimum condition for bacterial growth. The results showed that isolated strains CPB 1, CPB 3, and CPB 5 with medium containing nutrient broth and 3.2 mM calcium lactate pentahydrate gave the optimum growth, pH and Eh, thus being favourable for the process of calcium carbonate precipitation. Hence, this will be useful for self-healing concrete.

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