Prospects for the bottom ash from hydraulic removal use if in dry building mixtures. Part 2

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Abstract

Improving the quality of construction gypsum mixtures will be determined by a number of their advantages, which determine their performance characteristics. This makes it possible to solve a number of problems related to creating a comfortable living environment, reducing the carbon footprint, ensuring energy efficiency of construction technologies and constructed facilities without damaging the environment. These problems can be solved by recycling waste from thermal power plants and products based on them in the production of modified gypsum general construction mixtures. The article examines the possibilities of using activated carbon fractions isolated from hydraulic ash waste to improve the performance properties of gypsum dry building mixtures. An overview of existing methods of using ash and slag waste in the production of binders and their disadvantages is presented. The need for innovative methods for assessing and selecting the granulometric composition of modified mixtures is substantiated. The granulometric composition of the original gypsum binder and isolated carbon fractions, which have a special internal structure, are studied. Experimental results show that modified gypsum mixtures with a carbon modifier and a selected granulometric composition provide high quality materials based on them. The work represents a valuable contribution to the use of carbon fractions of hydraulic ash waste in the production of building mixtures, opening up new opportunities for the effective processing of ash and slag waste from thermal power plants and protection from man-made pollution of the natural environment.

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About the authors

K. S. Petropavlovskii

Tver State Technical University

Author for correspondence.
Email: kspetropavlovsky@gmail.com

Candidate of Sciences (Engineering) 

Russian Federation, 22, Afanasiya Nikitina, Tver, 170026

T. B. Novichenkova

Tver State Technical University

Email: tanovi.69@mail.ru

Candidate of Sciences (Engineering) 

Russian Federation, 22, Afanasiya Nikitina, Tver, 170026

V. B. Petropavlovskaya

Tver State Technical University

Email: victoriapetrop@gmail.com

Doctor of Sciences (Engineering) 

Russian Federation, 22, Afanasiya Nikitina, Tver, 170026

M. Al-Sweity

Tver State Technical University

Email: mohadsweity@gmail.com

Engineer 

Russian Federation, 22, Afanasiya Nikitina, Tver, 170026

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Supplementary files

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2. Fig. 1. Integral density curve and differential distribution of the initial technogenic carbon powder

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3. Fig. 2. Microstructure of hydraulic ash powders: a – is the initial mixture of fuel ash and slag before flotation; b – is the composition of a man–made ash modifier with the inclusion of carbon particles with pores; 1 – is carbon particles; 2 – is silicate particles

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4. Fig. 3. Integral density curve and differential grain distribution of: a – gypsum binder; b – the initial technogenic carbon powder; c – activated technogenic carbon powder

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5. Fig. 4. Integral distribution of particles in a gypsum mixture with a carbon modifier of optimal granulometric composition

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6. Fig. 5. Pore size distribution in gypsum modified stone of optimal granulometric composition

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