Degree of MWCNT suspension dispersity and its influence on rheology of cement pastes-Reference-Cited by-同舟云学术

Degree of MWCNT suspension dispersity and its influence on rheology of cement pastes

Published:2019-12-03 Issue: Volume: Page:
ISSN:2029-9915
Container-title:Modern Building Materials, Structures and Techniques (MBMST)
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Author:

Skripkiunas Gintautas¹,Karpova Ekaterina¹,Bendoraitiene Joana²,Barauskas Irmantas³,Drochytka Rostislav⁴

Affiliation:

1. Department of Building Materials and Fire Safety, Vilnius Gediminas Technical University, Vilnius, Lithuania

2. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Kaunas, Lithuania

3. Department of Silicate Technology, Kaunas University of Technology, Kaunas, Lithuania

4. Department of Technology of Building Materials and Components, Brno University of Technology, Brno, Czech Republic

Abstract

Modification of cement pastes by MWCNT (multi-walled carbon nanotubes) suspension enables to manage by their rheological properties due to the nanometer size of MWCNT. Dispersity degree of MWCNT suspension may be determined by the number of factors such as type and intensity of homogenization equipment, duration of homogenization and some other. The aim of present research consists in the establishment of optimal methodology of MWCNT suspension homogenization and investigation of dependence between dispersity degree of MWCNT suspension and rheological properties of cement pastes with that suspension. Two types of homogenization methods of MWCNT were tested such as ultrasonication and homogenization based on rotor-stator principle. The ultrasonication treatment about 6 min was established as optimal homogenization technique in the course of the current research. The yield stress and plastic viscosity of cement paste modified by MWCNT suspension increased in comparison with cement paste modified by polycarboxylate ether plasticizer (PCE) in 5 and 30 min after cement pastes mixing.Time of ultrasonication of MWCNT suspension more than 6 min did not have the influence on rheological behaviour of cement pastes.Addition of MWCNT decreased the volume coefficient of water bleeding of cement paste with PCE by 18%.

Publisher

Vilnius Gediminas Technical University

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