scholarly journals Flow-driven control of calcium carbonate precipitation patterns in a confined geometry

2016 ◽  
Vol 18 (36) ◽  
pp. 25592-25600 ◽  
Author(s):  
Gábor Schuszter ◽  
Fabian Brau ◽  
A. De Wit
Keyword(s):  
Aqueous Solution ◽  
Calcium Carbonate ◽  
Calcium Ions ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Confined Geometry ◽  
Precipitation Patterns ◽  
Hele Shaw Cell

Upon injection of an aqueous solution of carbonate into a solution of calcium ions in the confined geometry of a Hele-Shaw cell, various calcium carbonate precipitation patterns are observed.

scholarly journals Enhancing the yield of calcium carbonate precipitation by obstacles in laminar flow in confined geometry

2021 ◽  
Author(s):  
Gabor Schuszter ◽  
Edina Balog ◽  
Akos Kukovecz ◽  
Katalin Viktória Bere ◽  
László Janovák ◽  
...  
Keyword(s):  
Porous Media ◽  
Calcium Carbonate ◽  
Pattern Formation ◽  
Laminar Flow ◽  
Precipitation Pattern ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Confined Geometry ◽  
Hele Shaw Cell

Flow-driven precipitation experiments are performed in model porous media shaped within the confinement of a Hele-Shaw cell. Precipitation pattern formation and the yield of the reaction are investigated when borosilicate...

scholarly journals Agricultural by-products and oyster shell as alternative nutrient sources for microbial sealing of early age cracks in mortar

AMB Express ◽  
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Minyoung Hong ◽  
Indong Jang ◽  
Yongjun Son ◽  
Chongku Yi ◽  
Woojun Park
Keyword(s):  
Calcium Carbonate ◽  
Calcium Ions ◽  
Oyster Shell ◽  
Carbonate Precipitation ◽  
Sporulation Medium ◽  
Calcium Carbonate Precipitation ◽  
X Ray ◽  
Sesame Meal ◽  
Calcium Sources ◽  
By Products

AbstractBio-concrete using bacterially produced calcium carbonate can repair microcracks but is still relatively expensive due to the addition of bacteria, nutrients, and calcium sources. Agricultural by-products and oyster shells were used to produce economical bio-concrete. Sesame meal was the optimal agricultural by-product for low-cost spore production of the alkaliphilic Bacillus miscanthi strain AK13. Transcriptomic dataset was utilized to compare the gene expressions of AK13 strain under neutral and alkaline conditions, which suggested that NaCl and riboflavin could be chosen as growth-promoting factors at alkaline pH. The optimal levels of sesame meal, NaCl, and riboflavin were induced with the central composite design to create an economical medium, in which AK13 strain formed more spores with less price than in commercial sporulation medium. Calcium nitrate obtained from nitric acid treatment of oyster shell powder increased the initial compressive strength of cement mortar. Non-ureolytic calcium carbonate precipitation by AK13 using oyster shell-derived calcium ions was verified by energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. Stereomicroscope and field emission scanning electron microscopy confirmed that oyster shell-derived calcium ions, along with soybean meal-solution, increased the bacterial survival and calcium carbonate precipitation inside mortar cracks. These data suggest the possibility of commercializing bacterial self-healing concrete with economical substitutes for culture medium, growth nutrient, and calcium sources.

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