Reuse of Concrete Waste as Input Products for Cement Concretes

The paper explores the comprehensive application of concrete waste as (recycled) crushed stone instead of natural cement in cement concrete across cement strength classes above B35 as established by GOST 26633–15 as well as looking into its use as a recycled bonding material. It has been established that recycled crushed stone made of concrete waste with a crushing grade of M600 can be used for producing concretes with a class of B40 and a frost resistance of F₁ 200 with its properties in no way inferior to natural filler-based concretes with a crushing grade of 1200. The paper also presents the findings of experimental studies involving replacing Portland cement by a recycled bonding material. It is shown that the superplasticizer which is part of the composition of the concrete also happens to serve as its grinding intensifier and the efficiency of the recycled bonding material depends on the initial composition of crushed concrete, while replacing Portland cement with a recycled bonding material will save from 20 to 40% of that bonding material. The multiplicity factor of disposal of the same concrete has been determined. The authors of the paper have shown that the secondary use of concrete waste allows for increasing amounts which can be put to effective use not only as recycled crushed stone in high-quality concretes of widespread classes, but also as an active mineral additive. These study materials will be of use to manufacturers of concrete and concrete products.

N.M. KRASINIKOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
E.V. KYRILLOVA, Bachelor (master’s student) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.G. KHOZIN, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Kazan State University of Architecture and Engineering (1, Zelenaya Street, Kazan, 420043, Russian Federation)

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