Bio-derived rheology modifying agents for cement-based materials

Name: Bio-derived rheology modifying agents for cement-based materials
Author: Azima, M., Bundur, Zeynep Başaran

İsim	Bio-derived rheology modifying agents for cement-based materials
Yazar	Azima, M., Bundur, Zeynep Başaran
Basım Tarihi:	2020
Basım Yeri	- Springer
Konu	Cement paste, Rheology, Viscosity, Yield stress, Microorganisms
Tür	Kitap
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	2211-0844
Kayıt Numarası	9800adc8-ea03-4dd5-80fe-a03bee7a9cb5
Lokasyon	Civil Engineering
Tarih	2020
Notlar	TÜBİTAK ; BASF ; Consejo Nacional de Investigaciones Científicas y Técnicas
Örnek Metin	In recent few years, significant development has been made in concrete technology to accommodate the requirements of high-performance concrete. Rheology Modifying Agents (RMAs) (such as superplasticizers) and Viscosity Modifying Agents (VMAs) have been developed as two alternative admixtures to obtain the required workability. However, these admixtures not only increased the environmental impacts of concrete production but also increased the unit cost of concrete. Following these concerns, several studies have been focusing on exploring more sustainable approaches in concrete production such as the use of bio-based admixtures in concrete production. Throughout the literature, bio-based polysaccharides (cellulose, chitosan, etc.) were found to be highly effective as VMAs. Long chain molecules of these polysaccharides stick to the water molecules, decrease their relative motion and forms a gel, so increase the yield stress and plastic viscosity. This behaviour reduces the bleeding and segregation, which results in robust highly workable concrete. The interest in this study was motivated by the vital demand to introduce a greener and more sustainable VMA to improve the rheological properties of cement paste. To this end, bacterial cells proposed as VMAs for cement-based materials. The bacterial cells were directly incorporated into the mix of water without any additional intervention. The rheological measurements were implemented to evaluate the influence of cells on apparent viscosity and yield strength. In addition, the use of superplasticizers and fly ash on the performance of biological VMA were also 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, bacterial cells were found to be compatible with the use of both fly ash and superplasticizers.
DOI	10.1007/978-3-030-22566-7_10
Cilt	23

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Bio-derived rheology modifying agents for cement-based materials

Yazar Azima, M., Bundur, Zeynep Başaran

Basım Tarihi 2020

Basım Yeri - Springer

Konu Cement paste, Rheology, Viscosity, Yield stress, Microorganisms

Tür Kitap

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 2211-0844

Kayıt Numarası 9800adc8-ea03-4dd5-80fe-a03bee7a9cb5

Lokasyon Civil Engineering

Tarih 2020

Notlar TÜBİTAK ; BASF ; Consejo Nacional de Investigaciones Científicas y Técnicas

Örnek Metin In recent few years, significant development has been made in concrete technology to accommodate the requirements of high-performance concrete. Rheology Modifying Agents (RMAs) (such as superplasticizers) and Viscosity Modifying Agents (VMAs) have been developed as two alternative admixtures to obtain the required workability. However, these admixtures not only increased the environmental impacts of concrete production but also increased the unit cost of concrete. Following these concerns, several studies have been focusing on exploring more sustainable approaches in concrete production such as the use of bio-based admixtures in concrete production. Throughout the literature, bio-based polysaccharides (cellulose, chitosan, etc.) were found to be highly effective as VMAs. Long chain molecules of these polysaccharides stick to the water molecules, decrease their relative motion and forms a gel, so increase the yield stress and plastic viscosity. This behaviour reduces the bleeding and segregation, which results in robust highly workable concrete. The interest in this study was motivated by the vital demand to introduce a greener and more sustainable VMA to improve the rheological properties of cement paste. To this end, bacterial cells proposed as VMAs for cement-based materials. The bacterial cells were directly incorporated into the mix of water without any additional intervention. The rheological measurements were implemented to evaluate the influence of cells on apparent viscosity and yield strength. In addition, the use of superplasticizers and fly ash on the performance of biological VMA were also 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, bacterial cells were found to be compatible with the use of both fly ash and superplasticizers.

DOI 10.1007/978-3-030-22566-7_10

Cilt 23