Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

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.

Influence of complex additives based on sulfoaluminate cement on the properties of composite binder

“…Analysis of the references showed that tripoli is a highly porous zeolite-containing polymineral rock of sedimentary origin [18]. Tripoli is widely used in construction; for example, in the production of Portland slag cement, part of the slag is replaced with tripoli (no more than 10% by weight of cement) and gypsum-cement-pozzolanic binders [19,20]. In this paper, tripoli from the Khotynets deposit was used, the mineral composition of which is represented by zeolites: clinoptilolite, montmorillonite, and opal-cristoballite.…”