Sand made from recycled concrete is perspective raw material for dry building mixes

摘要

The basic properties of sands from sifting of crushed concrete scraps are studied in comparison with sands from sifting crushed granite, which is traditionally used for floor screed production. It is established that the replacement of granite fine aggregate with sand from the screening of crushing concrete scrap leads to a decrease in the quality indices of solidified solutions by 10-30%. The optimal grain particles size of sands from sifting of crushed concrete scraps was elaborated for the properties improvement of the final material. The composition of dry building flooring sealing mix B12,5 strength class for leveling was developed on the basis of the composition of sands from crushed concrete in correspondence with the requirements of standards.