Quantification of chemical and biological calcium carbonate precipitation: Performance of self-healing in reinforced mortar containing chemical admixtures

2014 ◽  
Vol 50 ◽  
pp. 10-15 ◽  
Author(s):  
Claudia Stuckrath ◽  
Ricardo Serpell ◽  
Loreto M. Valenzuela ◽  
Mauricio Lopez
Keyword(s):  
Calcium Carbonate ◽  
Carbonate Precipitation ◽  
Self Healing ◽  
Calcium Carbonate Precipitation ◽  
Chemical Admixtures

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.

scholarly journals Insights into the Current Trends in the Utilization of Bacteria for Microbially Induced Calcium Carbonate Precipitation

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4993 ◽  
Author(s):  
Sing Chuong Chuo ◽  
Sarajul Fikri Mohamed ◽  
Siti Hamidah Mohd Setapar ◽  
Akil Ahmad ◽  
Mohammad Jawaid ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Concentration Addition ◽  
Bacillus Species ◽  
Carbonate Precipitation ◽  
Self Healing ◽  
Calcium Carbonate Precipitation ◽  
Other Substances ◽  
Materials Used ◽  
Reducing Bacteria ◽  
Ureolytic Bacteria

Nowadays, microbially induced calcium carbonate precipitation (MICP) has received great attention for its potential in construction and geotechnical applications. This technique has been used in biocementation of sand, consolidation of soil, production of self-healing concrete or mortar, and removal of heavy metal ions from water. The products of MICP often have enhanced strength, durability, and self-healing ability. Utilization of the MICP technique can also increase sustainability, especially in the construction industry where a huge portion of the materials used is not sustainable. The presence of bacteria is essential for MICP to occur. Bacteria promote the conversion of suitable compounds into carbonate ions, change the microenvironment to favor precipitation of calcium carbonate, and act as precipitation sites for calcium carbonate crystals. Many bacteria have been discovered and tested for MICP potential. This paper reviews the bacteria used for MICP in some of the most recent studies. Bacteria that can cause MICP include ureolytic bacteria, non-ureolytic bacteria, cyanobacteria, nitrate reducing bacteria, and sulfate reducing bacteria. The most studied bacterium for MICP over the years is Sporosarcina pasteurii. Other bacteria from Bacillus species are also frequently investigated. Several factors that affect MICP performance are bacterial strain, bacterial concentration, nutrient concentration, calcium source concentration, addition of other substances, and methods to distribute bacteria. Several suggestions for future studies such as CO2 sequestration through MICP, cost reduction by using plant or animal wastes as media, and genetic modification of bacteria to enhance MICP have been put forward.

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