Abstract
The issues of the modification of a binder in structural cement concrete for mine and underground construction with wastes of chemical enterprises are considered in the article. Hundreds of tons of waste are generated annually at chemical enterprises of the Russian Federation, polluting the environment and requiring their disposal. The performed studies deal with the improvement of physical and mechanical properties of a cement binder with a dispersed manganese sludge modifier, which is a waste product of ammonia or methanol production, for its use in mine and underground construction. As a result of the studies performed, it was found that the addition of dispersed sludge with manganese oxide in an amount of 4% of the cement mass to a cement binder leads to the activation of the cement hydration process, while the rate of development of the plastic strength of the cement stone structure increases, the period of its structure formation reduces and the compressive cement stone strength increases by 17-18%, which makes it possible to reduce the cement content in structural concrete by 8.8-10.0% while maintaining its strength, reducing the cost of mine and underground structures and, as a result, reducing the cost of mining.
Highlights
The volume of coal production increases annually in the Kemerovo region - Kuzbass; for example, the volume of coal production increased by 20% over the past 5 years [1,2]
The analysis of the results of the performed experiments showed that the addition of manganese sludge to the cement binder in an amount of 4% of the cement mass leads to a maximum increase in the ultimate compressive strength of the cement stone by 17-18%
The analysis of the results of the performed experiments showed that the manganese sludge admixture to the cement binder in an amount of 4% of the cement mass leads to a maximum increase in the compressive strength of the cement-sand mortar by 15-18%
Summary
The volume of coal production increases annually in the Kemerovo region - Kuzbass; for example, the volume of coal production increased by 20% over the past 5 years [1,2] Increasing and maintaining such a volume of coal production requires the construction of a large number of various mine and underground structures. Due to the large volumes of coal production in the Kemerovo region - Kuzbass, the governor presented a new environmental standard - "Clean coal - Green Kuzbass", the implementation of which requires to minimize the environmental damage in the coal mining region [7,8] To solve this problem, it is possible to reuse waste from various industries as raw materials for the production of various building materials, which allows simultaneously solving two problems: waste disposal and reducing the extraction of raw materials for the production of new building materials [9,10,11]
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