CONCRETES AND MORTAR BASED ON TPP WASTE ASH

Abstract

Tens of millions of tons of various secondary mineral resources have accumulated in landfills, dumps, and storage facilities in the Dnieper region - ash and slag mixtures from thermal power plants (TPPs), etc.). Theoretical and experimental studies have shown that vibrovacuum compaction is a more effective method of compacting fly ash concrete compared to the traditional method of vibration compaction. Compaction of concrete mixtures using vibration vacuum makes it possible to significantly increase the density, strength, frost resistance and other properties of such concretes. For concretes with the same strength, it is possible to reduce cement consumption.

In this case, it is possible to carry out immediate demolding, as well as significantly reduce the duration of heat treatment. The proposed molding method does not require significant capital costs for implementation, since it uses standard equipment that is widely used in the construction industry and reinforced concrete technology. The relevance of the work is the development and research of the technology of vibrovacuum processing of concrete mixtures based on secondary mineral resources, which allows obtaining high-quality concrete (increased density with strength and other properties). A method of improving the quality of ash-slag vacuum concrete by adding a small amount of electrolyte to the concrete mixture during its preparation is proposed. The main properties of vibrocompacted and vibrovacuum-filled concretes based on secondary mineral resources were investigated, a comparative assessment of these properties was carried out, and the advantages of vacuum concretes were proven. The most objective assessment of the strength characteristics and other physical and mechanical properties of concrete based on secondary mineral resources, compacted by vibration vacuum, can be obtained in production conditions, for example, in reinforced concrete plants.