Decorative coatings based on the processing of fine waste crushing concrete scrap

Evgeniya Tkach,Askar Kulibayev,Kanapiya Nurbaturov,V Andreev,A Ter-Martirosyan,T Matseevich,A Adamtsevich

doi:10.1051/matecconf/201819604048

Evgeniya Tkach, Askar Kulibayev + Show 5 more

Open Access

https://doi.org/10.1051/matecconf/201819604048

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Abstract

Experiments were carried out to determine the rational range of the proportion of fillers from sand and the dropout of crushing concrete scrap as a replacement part of the cement to obtain colloidal cement glue and to assess the effect of fillers of different specific surface area and the degree of filling on the kinetics of the set of strength of the hardened stone. It is established that the composition of the concrete scrap crushing drop-out contains about 30% of non-hydrated Portland cement, which deter-mines its use as an active micro-filler in the production of fine cement sys-tems. According to its chemical composition, the elimination of crushing of concrete scrap from heavy concrete is presented in the form of com-pounds of oxide groups, which, as a result of the interaction, provide the process of solid-phase synthesis of new compounds and are not able to en-ter into chemical interaction with pigments, the color of which is deter-mined by the type and content of iron oxides, and therefore has no contra-indications for use in decorative thin-milled cement systems.

Highlights

Improving the energy efficiency of construction is essential when using green technologies in construction
Use as a filler in colloidal cement glue screenings from the concrete crushing process will contribute to ensuring environmental safety in construction activities and the efficient management of the process of rational use of construction waste generated at certain stages of the life cycle of real estate
Formed particle surface has a much higher value of surface energy, which makes them a higher adhesion activity by improving conditions of wetting. These studies have shown that the grinding of sand or the elimination of crushing of secondary crushed stone from concrete scrap allows to increase their specific surface area, to obtain the required particle size distribution, and to improve the surface quality of particles by removing and destroying the surface inactive films, which increases the reactivity of the filler in various processes in the production of decorative coatings based on colloidal cement systems

Summary

Introduction

Waste is always generated: a mixture of loose, lump, sheet, dust, etc. materials that, to some extent, are both of commercial interest and a certain danger to the environment. Waste is always generated: a mixture of loose, lump, sheet, dust, etc. There is a need for the processing of such waste and their use as secondary raw materials for various materials and structures. For the rational use of raw materials is of interest to use as fillers of various industrial wastes, including fine-grained screenings of processing of concrete scrap, which is currently not widely used [8,9]. Use as a filler in colloidal cement glue screenings from the concrete crushing process will contribute to ensuring environmental safety in construction activities and the efficient management of the process of rational use of construction waste generated at certain stages of the life cycle of real estate (manufacturing, construction, reconstruction, renovation, demolition)

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