Exploiting advantages of empirical and optimization approaches to design alkali activated materials in a more efficient way

Kočí, Václav; Koňáková, Dana; Pommer, Vojtěch; Keppert, Martin; Vejmelková, Eva; Černý, Robert

doi:10.1016/j.conbuildmat.2021.123460

Cited by 7 publications

(3 citation statements)

References 65 publications

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“…The benefits of conjoint milling were confirmed by the increase in the density and lower material porosity, which refers to a better reactivity of blended precursor. Together with the improvement in the mechanical strength related to increased temperature curing up to 90 °C [ 40 ], a significant shift in the functional performance can be obtained supported by the advanced mixture design optimization techniques [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Experimental and Environmental Analysis of High-Strength Geopolymer Based on Waste Bricks and Blast Furnace Slag

et al. 2023

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The rationalization of material flows, together with the utilization of waste raw materials for the production of alternative binders, became a very attractive topic during the last decades. However, the majority of designed materials can be used as a replacement for low-performance products. In this work, the waste materials (brick powder and blast furnace slag) are valorized through geopolymerization to design high-performance material as an alternative to high-performance concrete. Designed mixtures activated by sodium silicate and waste-originated alkali solution are characterized by the meaning of the chemical and mineralogical composition, evolution of hydration heat, and mechanical strength test. To contribute to the understanding of the environmental consequences and potential benefits, the carbon footprint and embodied energy analysis are provided. Obtained results highlight the potential of end-of-life bricks for the design of high-performance composites if mixed together with more reactive precursors. Here, even values over 60 MPa in compressive strength can be achieved with the dominant share of low-amorphous brick powder. The higher crystalline portion of brick powder may lead to the reduction of drying shrinkage and preservation of flexural strength to a greater extent compared to used slag. Performed environmental analysis confirmed the CO2 emission savings; however, the embodied energy analysis revealed a huge impact of using alkaline activators.

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Section: Resultsmentioning

confidence: 99%

Experimental and Environmental Analysis of High-Strength Geopolymer Based on Waste Bricks and Blast Furnace Slag

et al. 2023

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“…All these precursor powders were used for mixing of AAA composites according to recipe in table 3. This specific proportion of components resulted from the optimization experiment published in [15]. The difference between previous studies [11,15] lies in fact that in this work, potassium-based activator was used.…”

Section: Methodsmentioning

confidence: 99%

“…This specific proportion of components resulted from the optimization experiment published in [15]. The difference between previous studies [11,15] lies in fact that in this work, potassium-based activator was used. Specifically, the K 2 O•SiO 2 solution (water glass) containing 26 % by mass of K 2 O and 28.5 % by mass of SiO 2 was used.…”

Section: Methodsmentioning

confidence: 99%

Physical properties of alkali activated aluminosilicates based on low-reactivity ceramics in room temperature conditions

Keppert,

Pommer,

Šádková

et al. 2023

J. Phys.: Conf. Ser.

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Alkali activated aluminosilicates (AAA), or geopolymers, are widely studied materials because they are supposed to become a more sustainable alternative to materials based on Portland cement, such is especially concrete. AAA materials are generally produced by activation of an aluminosilicate precursor by an alkaline solution – usually solution of sodium silicate and sodium hydroxide. The capability of the prepared material to be used as construction material is commonly evaluated by means of its compressive strength. The present paper aims to broaden the AAA materials characterization to other physical properties such are porosity and thermal conductivity, since these measures are closely related to the engineering performance of the material. The waste ceramic dust was used as precursor while the solution of potassium silicate was an activator. The relationships between the above listed physical properties and obviously on the material composition were searched.

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Reactivity of precursors for geopolymerization studied by isothermal calorimetry

Keppert,

Koňáková,

Pommer

et al. 2024

J Therm Anal Calorim

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Exploiting advantages of empirical and optimization approaches to design alkali activated materials in a more efficient way

Cited by 7 publications

References 65 publications

Experimental and Environmental Analysis of High-Strength Geopolymer Based on Waste Bricks and Blast Furnace Slag

Experimental and Environmental Analysis of High-Strength Geopolymer Based on Waste Bricks and Blast Furnace Slag

Physical properties of alkali activated aluminosilicates based on low-reactivity ceramics in room temperature conditions

Reactivity of precursors for geopolymerization studied by isothermal calorimetry

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