A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Role of calcium sources in the strength and microstructure of microbial mortar
Highlights Aragonite crystal of carbonate precipitation was found when Ca(CH3COO)2 was used. Microbial mortar samples treated with three different calcium sources were prepared. The UCS of samples treated with Ca(CH3COO)2 were higher than that of the others. The BTS of samples treated with Ca(CH3COO)2 were higher than that of the others.
Abstract This study investigated the uniaxial compressive strength, splitting tensile strength and water absorption ratio of microbial mortars treated with three different calcium sources (CaCl2, Ca(CH3COO)2 and Ca(NO3)2). The results showed that the uniaxial compressive and splitting tensile strengths of microbial mortars treated with Ca(CH3COO)2 were about twice those of the microbial mortars treated with the other two calcium sources (‘the others’ hereafter). The results of mercury intrusion porosimetry analysis showed that the pore size distribution in the microbial mortar treated with Ca(CH3COO)2 was much more uniform than that of the others. The mineralogical compositions and the microstructure morphology of the microbially induced calcium carbonate precipitation were analyzed in detail. Scanning electron microscopy and X-ray diffraction revealed that the calcium carbonate cemented in the microbial mortar treated with Ca(CH3COO)2 were different from others. Besides the calcite and the vaterite crystals, aragonite crystals with an acicular mineral morphology were observed. Calcium acetate is a more appropriate calcium source than calcium chloride for the application of MICP technology in reinforced concrete structures because it avoids the corrosion of steel bars caused by chloride ion.
Role of calcium sources in the strength and microstructure of microbial mortar
Highlights Aragonite crystal of carbonate precipitation was found when Ca(CH3COO)2 was used. Microbial mortar samples treated with three different calcium sources were prepared. The UCS of samples treated with Ca(CH3COO)2 were higher than that of the others. The BTS of samples treated with Ca(CH3COO)2 were higher than that of the others.
Abstract This study investigated the uniaxial compressive strength, splitting tensile strength and water absorption ratio of microbial mortars treated with three different calcium sources (CaCl2, Ca(CH3COO)2 and Ca(NO3)2). The results showed that the uniaxial compressive and splitting tensile strengths of microbial mortars treated with Ca(CH3COO)2 were about twice those of the microbial mortars treated with the other two calcium sources (‘the others’ hereafter). The results of mercury intrusion porosimetry analysis showed that the pore size distribution in the microbial mortar treated with Ca(CH3COO)2 was much more uniform than that of the others. The mineralogical compositions and the microstructure morphology of the microbially induced calcium carbonate precipitation were analyzed in detail. Scanning electron microscopy and X-ray diffraction revealed that the calcium carbonate cemented in the microbial mortar treated with Ca(CH3COO)2 were different from others. Besides the calcite and the vaterite crystals, aragonite crystals with an acicular mineral morphology were observed. Calcium acetate is a more appropriate calcium source than calcium chloride for the application of MICP technology in reinforced concrete structures because it avoids the corrosion of steel bars caused by chloride ion.
Role of calcium sources in the strength and microstructure of microbial mortar
Zhang, Y. (author) / Guo, H.X. (author) / Cheng, X.H. (author)
Construction and Building Materials ; 77 ; 160-167
2014-12-24
8 pages
Article (Journal)
Electronic Resource
English
Role of calcium sources in the strength and microstructure of microbial mortar
| Online Contents | 2015
Method for preparing high-strength microbial mortar from nano calcium carbonate
| European Patent Office | 2024
Enrichment of compressive strength in microbial cement mortar
| Online Contents | 2014
Microbial activity on the microstructure of bacteria modified mortar
| Elsevier | 2009
Microbial activity on the microstructure of bacteria modified mortar
| Online Contents | 2009