Złącza w prefabrykowanych konstrukcjach ścianowych

The law of affinity of structures developed by the authors is based on basic properties and regularities inherent in the basic and bonding material and the combination of properties that ensure properties of the contact layer for reliable and durable construction operation. In recent decades, new composites with a number of required physical, mechanical and operational properties have been developed. To produce modern efficient materials which would be uniform, strong and durable, it was proposed to apply the law of affinity of structures.

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New methods for manufacturing composite materials

Zagorodnuk

Lesovik

Elistratkin

et al. 2019

J. Phys.: Conf. Ser.

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In-service performance of hybrid geopolymer binders based class F fly ash

Kozhukhova

Teslya

Kozhukhova

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Production of high-performance construction materials, meeting the requirements of construction process when development of up-to-date buildings and structures is very relevant and requires the usage of effective polycomponent binding systems, including geopolymers This work studied mechanical performance, as well as strength, water absorption and water resistance of portland cement – Class F fly ash – NaOH hybrid geopolymer binding system. The bench scale testing was conducted on different mixes, including regular portland cement-based and Class F fly ash-NaOH geopolymer binders used as reference compositions. The developed hybrid binders demonstrated, that incorporation of portland cement up to 40% as a modifying agent, reduces the formation of water soluble mineral phases such as sodium carbonates and hydroxycarbonates in low reactive class F fly ash geopolymer binders. It was found, that the presence of portland cement in the system positively affects strength development and noticeably reduces water absorption and improves water resistance of the developed binders, which is related to formation of water resistant and stable calcium hydrosilicate phases (C-S-H)

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Influence of Fe component from milling yield on characteristics of perlite based geopolymers

Kozhukhova

Zhernovsky

Lebedev

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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The mineral and chemical composition of aluminosilicates used in geopolymer systems is critical for optimal structure formation and the overall performance of the geopolymer products. The composition of alumosilicates can be altered during the technological processing, especially, at the stage of fine milling. This study investigated the effect of aluminosilicate contamination with Fe from milling yield, the characteristics of the aluminosilicates with a metal lining, structure formation, and hardened properties of geopolymers based on different natural and technogenic persilicic aluminosilicates. The formation of Fe-phases due to milling yield was detected by the XRF analysis and the XRD investigation revealed the formation of nanosized ferrous hydroxide or bernalite Fe(OH)3(H2O)0.25. The volume of an elemental cell of the nanosized bernalite per Fe atom is 4.5 times larger than that of the metallic iron. This results in the disintegration of the matrix, which was observed by SEM and then confirmed by reduced strength performance of geopolymer composites. Based on this study, the negative effect of Fe-phases from milling and nanosized ferrous hydroxide on structural characteristics and service performance of geopolymer composites based on natural and technogenic raw materials was concluded.

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Złącza w prefabrykowanych konstrukcjach ścianowych

Cited by 5 publications

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New methods for manufacturing composite materials

New methods for manufacturing composite materials

In-service performance of hybrid geopolymer binders based class F fly ash

Influence of Fe component from milling yield on characteristics of perlite based geopolymers

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