Composite binders based on technogenic raw materials

Abstract

Introduction. Technological features of road construction require compliance with the requirements for road building materials in terms of physical and mechanical properties and performance characteristics. Control of structure formation processes in cement composite systems can be carried out by various methods and approaches, including choosing the optimal composition, adding special additives, regulating hydration conditions and using special processing methods. This makes it possible to improve the properties and characteristics of conglomerate materials, as well as eliminate or slow down the destruction of their structures. The purpose of this article is to develop composite binders for road use.Main part. It has been established that in composite binders with the replacement of 50% of Portland cement with waste from wet magnetic separation of ferruginous quartzites with an identified rational specific surface of 500 m2/kg, the activity remains practically at the same level as in the control additive-free compositions, which allows us to recommend this type of binder for development of concrete compositions for road construction.Conclusions. The addition of the identified rational content of the superplasticizer PFM-NLC (0.6 wt. %) to the co-milled Portland cement-MMC waste system made it possible to create a wide range of composite binders with setting times from 3 minutes. 5 sec. (start) up to 6 min. 35 sec. (end), bending activity up to 9.3 MPa and compression activity 60.7 MPa (with a ratio of bending activity to compression activity of up to 0.16).