Study of structural features and properties of composite cement-ash binders based cement stone

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Abstract

The article presents the studies results of the cement stone structure from composite binder (KV) based on Portland cement CEMI-42.5N (GOST 31108-2020) and hydraulically removed ashes from the Novo-Irkutsk Thermal Power Plant (hereinafter referred to as HRA). The HRA and cement stone (CS) structural characteristics are presented. The characteristics are obtained with the following methods of analysis: X-ray structural and X-ray fluorescence; TGA-thermogravimetric and petrographic, scanning electron microscopy (SEM). The dependences of the cement tile strength on the ratio of the binder components and their specific surface area, Ca(OH)2 content in the cement stone and chemically bound water have been established. It is shown that an increase in the HRA specific surface area relative to Portland cement increases the cement stone compressive strength (of all KV compositions), due to its pozzolanic activity. The HRA specific surface area priority over the Portland cement specific surface area allows make a favorable forecast of the developed binders economic efficiency since the HRA grindability is much higher than that of Portland cement, which significantly reduce energy consumption for grinding. That is why the developed KV compositions can be recommended for commercial concret and mortars production to be used in the construction complex of the Irkutsk region.

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About the authors

S. V. Makarenko

Irkutsk National Research Technical University

Author for correspondence.
Email: makarenko_83_07@mail.ru

Candidate of Sciences (Engineering), Docent

Russian Federation, 83, Lermontov Street, Irkutsk, 664074

V. G. Khozin

Kazan State University of Architecture and Engineering

Email: khozin.vadim@yandex.ru

Doctor of Sciences (Engineering), Professor

Russian Federation, 1, Zelenaya Street, Kazan, 420043, Republic of Tatarstan

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Supplementary files

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2. Fig. 1. TGA results of cement stone composite binder KV-50 (TG – black; DSC – green; ion current H2O – red; ion current CO2 – blue)

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3. Fig. 2. TGA results of cement stone composite binder KV-50 (Ionic current curves: brown – H2O; black – CO2; blue – CO)

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4. Fig. 3. Chemically bound water content depending on cement content in the composite binder composition: 1 – specific surface area 4500 sm2/g; 2 – specific surface area 7000 sm2/g

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5. Fig. 4. Chemically bound water content in cement stone depending on the Portland cement specific surface area

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6. Fig. 5. Ca(OH)2 content depending on the HRA specific surface area

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7. Fig. 6. Strength of cement stone depending on the URA specific surface area in the composite binder

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8. Fig. 7. The strength of cement stone depending on of Ca(OH)2 content not reacted with URA

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9. Fig. 8. Photographs of the CB-50 cement stone structure made with a polarizing microscope: a – with one polarizer; b – with crossed polarizers

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10. Fig. 9. Pictures of the cement stone CB-50 structure, combined with spectral analysis made with SEM

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11. Fig. 10. Evaluation of the conglomerates structure used in mineralogy (percentages indicate the crystalline inclusions content)

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