Mechanical-Chemical Activation of Cement-Sand Stone for Reuse in Construction

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Abstract

In modern construction concrete recycling is one of the promising directions of utilization of multi-tonnage concrete and reinforced concrete waste. Most often concrete crushing products are reused as coarse and fine aggregate. It is shown in the paper that reuse of the dusty fraction of cement-sand stone as an active colloidal additive obtained by its alkaline mechanical-chemical activation allows to partially replace cement in commercial concrete and hydraulically hardening compositions without loss of their strength. This paper presents the results of the effect of colloidal admixture on technological and physical-mechanical properties of concrete mixture.

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About the authors

P. A. Simonov

Novosibirsk State University

Author for correspondence.
Email: spa_nsk@mail.ru

Candidate of Sciences

Russian Federation, Novosibirsk

G. I. Storozhenko

Novosibirsk State University of Architecture and Civil Engineering (SIBSTRIN)

Email: baskey_ltd@mail.ru

Doctor of Sciences

Russian Federation, Novosibirsk

M. A. Rakov

Novosibirsk State University of Architecture and Civil Engineering (SIBSTRIN)

Email: westcoast89@mail.ru

Candidate of Sciences

Russian Federation, Novosibirsk

H. B. Manzyrykchy

Tuvinian Institute for Exploration of Natural Resources of Siberian Branch of RAS

Email: herelka_geotom@mail.ru

Junior Researcher

Congo, Republic of Tyva, Kyzyl

References

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Supplementary files

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2. Fig. 0

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3. Fig. 0.1

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4. Fig. 0.1.2

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5. Fig. 1. Scheme of possible surface reactions of hydrated C3AH6 (top) and C-S-H (bottom) with a chemical activator – NaOH

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6. Fig. 2. Scheme of chemical binding of the surface of particles of activated cement stone (shown as gray spheres) with the surface of the gel formed when mixing cement with water (shown as a wavy line)

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7. Fig. 3. Microphotographs of thin sections of the control sample: a, c – parallel nicoles; b, d – crossed nicoli. Symbols: ц.к – cement stone, Qtz – quartz, Db – diabase

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8. Fig. 4. Microphotographs of thin sections, sample С13: a, c – parallel nicoles; b, d – crossed nicoli. Symbols: ц.к – cement stone, Qtz – quartz, Db – diabase, Px – pyroxene

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