Photocatalytically Active Fine-Grained Concrete Based on Titanosilicate Waste


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Abstract

Photocatalytically active fine-grained concrete has been developed using a titanosilicate additive, which is a waste product from the production of titanosilicate sorbent. It has been established that the introduction of a titanosilicate additive into the composition of fine-grained concrete ensures the formation of an additional amount of calcium hydrosilicates, mainly low-basic ones, increases the density of the cement stone and reduces structural defects, thereby facilitating the production of higher-strength concrete with improved technical and operational properties. For the developed concrete composition containing 2% (by weight of cement) titanosilicate powder, 1.1 wt. % Glenium 51 superplasticizer, with a W/C of 0.42, an increase in compressive strength by 52% and a decrease in water absorption by 32% were recorded, reducing the depth of wear and weight loss by 35%, increasing frost resistance by 3 grades, compared to the additive-free composition. The surface of fine-grained concrete containing waste titanosilicate sorbent, in the decomposition reaction of methylene blue, exhibits the ability to self-clean under the influence of visible light, and under ultraviolet light it exceeds samples with commercial titanium dioxide. Also, the manifestation of the self-cleaning ability of modified concrete is confirmed by a decrease in the contact angle during irradiation with ultraviolet light.

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About the authors

V. V. Tyukavkina

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials named after I.V. Tananaev, FRC, Kola Science Centre of the Russian Academy of Sciences

Author for correspondence.
Email: v.tiukavkina@ksc.ru

Candidate of Sciences (Engineering)

Russian Federation, Apatity

A. V. Tsyryatieva

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials named after I.V. Tananaev, FRC, Kola Science Centre of the Russian Academy of Sciences

Email: a.tsyriateva@ksc.ru

Junior Researcher

Russian Federation, Apatity

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Supplementary files

Supplementary Files
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1. JATS XML
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2. Fig. 1. Curves of changes in the degree of decomposition of MB under UV (a) and BC (b) irradiation in solutions: 1 – titanosilicate powder; 2 – P25

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3. Fig. 2. Curves of TG and DSC of fine-grained concrete, modified TSP and control composition

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4. Fig. 3. Micrographs of the morphology of fine-grained concrete after hardening for 28 days

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5. Fig. 4. Change in the color intensity of MB on the surface of fine-grained concrete under the influence of UV (a) and BC (b): 1 – without additive; 2 – 2% P25; 3 – 2% titanosilicate powder

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6. Fig. 5. Changing the contact wetting angle on the concrete surface depending on the time of exposure to UV light: 1 – without additive; 2 – 2% P25; 3 – 2% titanosilicate powder

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