ҚАЙТА ӨҢДЕЛГЕН БЕТОН ТОЛТЫРҒЫШТАРЫН БЕТОНДА ҚОЛДАНУ

Abstract

Fine recycled concrete aggregates (fRCA), the current state is discussed, attention is paid to their physical, chemical and engineering properties, as well as the strength of fRCA concrete. Without further research, it is impossible to draw conclusions about the recommendations and tools for the widespread use of fRCA in new concretes, while maintaining the cement composition at least at the same level or preferably at a low level. In particular, what is still lacking, knowledge of basic physico-chemical properties and their relationship with the quality of the concrete mixture and the performance of concrete. Crushing and sifting of recycled aggregates, or laying the foundation for a better understanding of the quality of fRCA obtained from field structures. Comparing the properties of fRCA with the properties of finely dispersed natural aggregates, the main limiting properties of fRCA, such as high water absorption, the state of moisture content of fRCA, particle agglomeration and adhesive solution, are determined. Thus, it is difficult to achieve a stable fRCA quality, although it can be stable in chemical composition. In the design of concrete mixes, advanced performance methods and tools of concrete technology are needed to take into account the limiting properties of fRCA.