Implementation of Contact-Condensation Hardening Theory Mechanisms when Forming Building Composites

Purpose of research is to study cheaper composite materials for building structures such as cement-free ones without heat treatment, which will undoubtedly allow finding their application in building industry. To achieve this goal it is necessary to identify patterns of structure formation of clinker-free contact condensation hardening composite materials in which portlandite crystals act as a matrix, and the physicochemical active component of natural origin acts as a filler.

Methods. In accordance with the purpose set, one of the main tasks of the work was to be solved; it involved study-ing the patterns of structure formation of contact-condensation hardening systems relying on the basic principles of materials science, which include studying the influence of the composition, structure and state of the starting com-ponents on the properties of a composite material. In this work, we studied the role of the physicochemical activity of raw materials and the possibility of ‘combining’ a portlandite matrix with filling mechano-physicochemical active raw materials capable of producing new structures. To form the composite material, a compaction pressing technique at elevated specific pressures was used, which made it possible to implement the mechanisms of contact condensation technology of structure formation. The formation of physicochemical bonds of portlandite and aluminosilicate filler of various types is also possible with certain ratios of their mass fractions and V/I ratios the optimization of which was one of our objectives.

Results. The result of this work is to assess the impact of raw material characteristics and technology parameters on the properties of the resulting material, namely, the improvement of the compacting pressure and the amount of filler when getting a compacted composite.

Conclusion. The development of a technology of producing clinker-free contact condensation composites based on portlandite with aluminosilicate filler will expand the raw material base of local building materials, reduce their cost and energy consumption, that is, solve key issues of resource saving in the building materials production.

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