Concrete waste recycling technology

In Russia, as a result of the dismantling and demolition of buildings and structures, more than 15 million tons of construction waste are generated annually, and their number is growing annually. It is necessary to search for technical solutions and technologies for the use of concrete scrap in new composite materials.It is proposed to pre-process concrete waste in vortex layer apparatuses. This treatment makes it possible to obtain fine-grained concretes when replacing Portland cement with treated concrete waste in an amount of up to 20% with a strength 20–27% lower than the control compositions.The treatment of concrete waste in the vortex layer apparatus with a preliminary fraction of 0–5 mm for 5 minutes increases the specific surface area by 3.6 times. At the same time, the value of the zeta potential of the particles of the treated powder increases from 1.15 to 1.89 mV, which indicates an increase in its reactivity.The results obtained are also confirmed by an increase in the values of microdeformations with an increase in the specific surface area of the treated powder, which indicates the accumulation of surface energy in the crystaA technological line for processing concrete and reinforced concrete waste with a pretreatment unit in ABC has been developed, which will reduce the cost of inert aggregate for the production of building materials.