Influence of Sporasarcina pasteurii cells on rheological properties of cement paste

Name: Influence of Sporasarcina pasteurii cells on rheological properties of cement paste
Author: Azima, Mahzad, Bundur, Zeynep Başaran

İsim	Influence of Sporasarcina pasteurii cells on rheological properties of cement paste
Yazar	Azima, Mahzad, Bundur, Zeynep Başaran
Basım Tarihi:	2019-11-20
Basım Yeri	- Elsevier
Konu	Rheology, Microorganisms, Viscosity modifying agent (VMA), Superplasticizers, Fly ash
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	0950-0618
Kayıt Numarası	ac3fad61-a518-4e4c-bddf-51fa2fea7005
Lokasyon	Civil Engineering
Tarih	2019-11-20
Notlar	TÜBİTAK
Örnek Metin	Nowadays with the developments in the concrete materials technology, researches started to focus on highly flowable mixes with improved rheological properties. These highly flowable mixes generally require use of viscosity modifying agents (VMAs) to reduce bleeding and segregation. VMAs are water-soluble polymers that can be produced from acrylic polymers and polysaccharide-based biopolymers obtained from cellulose, starch or bacterial fermentation. Through the literature, nopal mucilage, brown algae and bacterial cell walls were proposed as alternatives to these bio-based admixtures. However, these alternatives also require extra processing which results again with a higher unit cost. This paper summarizes the rheological properties of a cement paste including bacterial cells. The main goal of this study was to investigate the influence of Sporasarcina pasteurii (S. pasteurii) cells on viscosity and yield stress of cement-based materials. The bacterial cells were directly incorporated to the mix water and influence of cells on viscosity and yield strength was evaluated by rheological tests. In addition, the influence of bacteria dosage, water to cement ratio (w/c), use of superplasticizers and fly ash on performance of biological VMA were investigated. Our results showed that the apparent viscosity and yield stress of the cement-paste mix were increased with the addition of the microorganisms. Moreover, the provided biological VMA was found to be compatible with the use of fly ash and superplasticizers depending on the w/c of cement paste.
DOI	10.1016/j.conbuildmat.2019.07.132
Cilt	225

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Influence of Sporasarcina pasteurii cells on rheological properties of cement paste

Yazar Azima, Mahzad, Bundur, Zeynep Başaran

Basım Tarihi 2019-11-20

Basım Yeri - Elsevier

Konu Rheology, Microorganisms, Viscosity modifying agent (VMA), Superplasticizers, Fly ash

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 0950-0618

Kayıt Numarası ac3fad61-a518-4e4c-bddf-51fa2fea7005

Lokasyon Civil Engineering

Tarih 2019-11-20

Notlar TÜBİTAK

Örnek Metin Nowadays with the developments in the concrete materials technology, researches started to focus on highly flowable mixes with improved rheological properties. These highly flowable mixes generally require use of viscosity modifying agents (VMAs) to reduce bleeding and segregation. VMAs are water-soluble polymers that can be produced from acrylic polymers and polysaccharide-based biopolymers obtained from cellulose, starch or bacterial fermentation. Through the literature, nopal mucilage, brown algae and bacterial cell walls were proposed as alternatives to these bio-based admixtures. However, these alternatives also require extra processing which results again with a higher unit cost. This paper summarizes the rheological properties of a cement paste including bacterial cells. The main goal of this study was to investigate the influence of Sporasarcina pasteurii (S. pasteurii) cells on viscosity and yield stress of cement-based materials. The bacterial cells were directly incorporated to the mix water and influence of cells on viscosity and yield strength was evaluated by rheological tests. In addition, the influence of bacteria dosage, water to cement ratio (w/c), use of superplasticizers and fly ash on performance of biological VMA were investigated. Our results showed that the apparent viscosity and yield stress of the cement-paste mix were increased with the addition of the microorganisms. Moreover, the provided biological VMA was found to be compatible with the use of fly ash and superplasticizers depending on the w/c of cement paste.

DOI 10.1016/j.conbuildmat.2019.07.132

Cilt 225