Rheological and mechanical properties of alkali-activated brick powder based pastes: effect of amount of alkali activator

International Conference Building Materials, Products and Technologies

土木建筑工程

Vyvail, M.^1 ; Vejmelková, E.^2 ; Rovnaníková, P.^1

Faculty of Civil Engineering, Brno University of Technology, Veveí 331/95, Brno

602 00, Czech Republic^1

Czech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, Praha 6

166 29, Czech Republic^2

关键词: Alkali activators;    Alkaline activators;    Alkaline solutions;    High viscosities;    Low yield stress;    Rheological and mechanical properties;    Rheological behaviour;    Viscoelastic properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/379/1/012011/pdf
DOI  :  10.1088/1757-899X/379/1/012011

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The rheological behaviour and mechanical properties of alkali-activated materials prepared by activation of a brick powder by alkaline solution (alkali + water glass) is presented in this paper. The effect of quantity of alkaline activator on the rheological and mechanical properties of brick pastes prepared from two types of brick dust was monitored. The rheological investigation included the characterization of flow properties and viscoelastic properties of the fresh mixtures. Compression and bending strengths were determined at 7, 28, 56 and 90 days. These materials have a low yield stress and a high viscosity strongly influenced by the amount of alkali activator. The fresh brick pastes become liquid more easily with increasing amount of alkali activator. The rising amount of alkali activator leads to a decrease of the material cohesion. The results of rheological and mechanical properties investigation showed considerable differences in behaviour of particular types of brick dust.