Modifying additive for concrete based on shungite processing waste

Abstract

Abstract The paper is devoted to the study of waste processing of shungite rocks, which are formed in the process of mining and technological operations. However, the market of national modifying additives based on local raw materials is not developed at the appropriate level in the presence of a rich resource base of the mining industry. In this regard, it is of great interest to obtain additives based on shungite rock processing waste, which allow expanding the range of mineral additives and providing qualitatively new properties for concrete and reinforced concrete products and structures. Such technologies for the production of additives are isolated and not developed at the proper level due to insufficient knowledge of shungite rocks. Analysis of the state of research on concrete and the market for modifying materials showed that the development of production of energy-efficient and environmentally friendly materials due to increasing regulatory requirements for them, as well as to environmental ecology and the obvious need to recycle industrial waste initiated the progressive development of concrete science. One of its latest achievements is modified concrete with special properties, which marked a new stage in the development of concrete. In its production technology, significant progress has been made in improving its chemical additives, special modifiers, as well as active and inactive fillers. In Kazakhstan, the main volume of modifying additives is imported from abroad, which significantly increases their cost, so their choice is limited. This paper is devoted to the research of waste processing of shungite rocks as a modifying mineral additive of concrete. Its influence on the main indicators of concrete is investigated and the features of the processes that occur in the hardening silicate system “cement - dispersed shungite particles” and contribute to increasing the strength of concrete, as well as reducing the duration of its heat-and-water treatment are studied.