Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

Valery Lesovik,Ruslan Lesovik,Vladislav Ryzhikh,Maria Karelina,Liliya Zagorodnyuk,Roman Fediuk,Nikolai Vatin

doi:10.3390/cryst11040369

Abstract

It is necessary to solve the ecological problems of regions where there is large-tonnage storage of various finely dispersed materials, including technogenic ones. This article presents the results of an investigation into the possible use of substandard dispersed quartz sands to obtain effective granular aggregates, with the purpose of putting them to use in mortars and concrete. The study used standard and original experimental research methods related to the analysis and preparation of raw materials, technological tests, and the study of the properties of finished composites. Investigations were carried out to obtain composite binders in the component composition of which the use of different ratios of Portland cement and substandard quartz sands prepared in a vortex jet mill was envisaged. It was found that the obtained composite binders had high physical and mechanical characteristics, which was due to the high specific surface area and hydration activity. On the basis of composite binders and finely dispersed quartz sands (fineness from ≤0.16 mm to 1 mm), the granulation of mixtures of 36 types of component compositions was performed. The developed compositions of granular aggregates (GAs) showed the possibility of obtaining them with sufficiently high strength values in cement stone. The studies carried out make it possible to recommend finely dispersed substandard and technogenic materials for the production of GAs, which would ensure the economy of binding materials as well as contribute to the reuse of large-tonnage waste of ferrous and nonferrous metallurgy and the chemical and mining industries.

Highlights

A significant portion of research work in the field of construction is aimed at studying and developing new environmentally friendly building materials with strong economic effects [1,2]
AnAnalyzing the experimental curves of particle size distribution, it should be noted that alyzing the experimental curves of particle size distribution, it should be noted that ground composite binders (CB-1, CB-2, CB-3) were distinguished by increased dispersion ground composite binders (CB-1, CB-2, CB-3) were distinguished by increased dispersion characteristics, with a particle distribution of 0.1 to 30 μm
It was found that when comite binders were milled, the specific surface area increased by two or more times; it was posite 2binders were milled,2the specific surface area 2increased by two or more times; it 652 m /kg for CB-1, 631 m /kg for CB-2, and 606 m /kg for CB-3

Summary

Introduction

A significant portion of research work in the field of construction is aimed at studying and developing new environmentally friendly building materials with strong economic effects [1,2]. Energy, and financial resources, as well as improving the construction industry, are priority tasks of scientists around the world [3,4]. The shortage of various building materials in certain territories is a big problem for the construction industry [5,6]. Due to the lack of building materials, construction companies, mining companies and other enterprises are forced to use local and man-made raw materials for production. The use of a local raw materials construction cluster does not always allow for environmentally and economically beneficial construction [7,8]. The production of concretes and mortars in different regions implies the use of individually selected raw materials in composite compositions, as a result of which quality may suffer and degradation of physical and mechanical characteristics is possible [9,10]

Methods

Results

Discussion

Conclusion