Use of natural minerals to immobilize bacterial cells for remediating cracks in cement-based materials

Name: Use of natural minerals to immobilize bacterial cells for remediating cracks in cement-based materials
Author: Tezer, M. M., Bundur, Zeynep Başaran

İsim	Use of natural minerals to immobilize bacterial cells for remediating cracks in cement-based materials
Yazar	Tezer, M. M., Bundur, Zeynep Başaran
Basım Tarihi:	2022-03-01
Basım Yeri	- ASCE
Konu	Bentonite, Biomineralization, Diatomaceous earth (DE), Self-healing, Sepiolite, Water absorption
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	0899-1561
Kayıt Numarası	394461db-f829-47a3-a4ab-b73fdd5a6f5d
Lokasyon	Civil Engineering
Tarih	2022-03-01
Örnek Metin	Cracks in cement-based materials are one of the main factors affecting the durability of structure. Recent research in the field of concrete materials showed that self-healing in cement-based systems can be achieved by triggering biogenic calcium carbonate (CaCO3) precipitation. The goal of this study is to establish a comparative evaluation of the use of sepiolite, bentonite, and diatomaceous earth (DE) as an immobilization barrier of Sporosarcina pasteurii (S. pasteurii) cells to trigger self-healing in cement-based systems. For the first time in the literature, this study will provide insight into the use of natural minerals, such as bentonite and sepiolite, as protective carriers for vegetative S. pasteurii cells in cement-based materials and present a comparative evaluation of factors influencing crack healing, such as the microstructure and composition of immobilization barriers. A two-phase self-healing bioadditive was obtained by immobilizing vegetative S. pasteurii cell samples on natural porous minerals with or without the use of required nutrients. Then the samples were cracked by a three-point bending test, and the healing process was screened via stereomicroscope imaging and ultrasonic pulse velocity (UPV) testing after subjecting the cracked samples to 28 days of moist curing. Flexural cracks induced in mortar samples were filled with biogenic precipitate. Relatedly, the water absorption capacity of the samples was decreased in mortar samples containing bacterial cells, the nutrients were added in the curing solution. Fourier transform infrared spectroscopy and scanning electron microscopy analyses showed that calcite was the predominant polymorph of CaCO3 sealant in cracks.
DOI	10.1061/(ASCE)MT.1943-5533.0004098
Cilt	34

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Use of natural minerals to immobilize bacterial cells for remediating cracks in cement-based materials

Yazar Tezer, M. M., Bundur, Zeynep Başaran

Basım Tarihi 2022-03-01

Basım Yeri - ASCE

Konu Bentonite, Biomineralization, Diatomaceous earth (DE), Self-healing, Sepiolite, Water absorption

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 0899-1561

Kayıt Numarası 394461db-f829-47a3-a4ab-b73fdd5a6f5d

Lokasyon Civil Engineering

Tarih 2022-03-01

Örnek Metin Cracks in cement-based materials are one of the main factors affecting the durability of structure. Recent research in the field of concrete materials showed that self-healing in cement-based systems can be achieved by triggering biogenic calcium carbonate (CaCO3) precipitation. The goal of this study is to establish a comparative evaluation of the use of sepiolite, bentonite, and diatomaceous earth (DE) as an immobilization barrier of Sporosarcina pasteurii (S. pasteurii) cells to trigger self-healing in cement-based systems. For the first time in the literature, this study will provide insight into the use of natural minerals, such as bentonite and sepiolite, as protective carriers for vegetative S. pasteurii cells in cement-based materials and present a comparative evaluation of factors influencing crack healing, such as the microstructure and composition of immobilization barriers. A two-phase self-healing bioadditive was obtained by immobilizing vegetative S. pasteurii cell samples on natural porous minerals with or without the use of required nutrients. Then the samples were cracked by a three-point bending test, and the healing process was screened via stereomicroscope imaging and ultrasonic pulse velocity (UPV) testing after subjecting the cracked samples to 28 days of moist curing. Flexural cracks induced in mortar samples were filled with biogenic precipitate. Relatedly, the water absorption capacity of the samples was decreased in mortar samples containing bacterial cells, the nutrients were added in the curing solution. Fourier transform infrared spectroscopy and scanning electron microscopy analyses showed that calcite was the predominant polymorph of CaCO3 sealant in cracks.

DOI 10.1061/(ASCE)MT.1943-5533.0004098

Cilt 34