Rudenko I. The scientific bases of structure formation of plasticized mortars and concretes based on alkaline cements

The object of research are structure formation processes of composite materials on the basis of all-in-one alkali-activated cements modified by surfactants. The subject of research are plasticized alkali-activated mortar and fresh mortars and concretes, mortars and concretes based on them. Testing techniques are modern methods and recommendations of normative documents of Ukraine as well as methods used in EU countries. The scientific novelty of the results is to create a scientific basis for managing the structure formation processes of plasticized mortars and concretes based on commercial alkali-activated cements, ensuring compliance with specified technological and physical-mechanical properties at the stages of formation of both coagulation and condensation-crystallization structures. For the first time it is proposed the scientific bases of structure formation of the mentioned composite materials at the stages of both coagulation and condensation-crystallization structures depending on the type of surfactants, alkaline cement composition and the degree of its rarefaction. It was theoretically determined and experimentally confirmed features of surfactants, which are determined by the stability of molecular structure, are compatible with alkaline cements and are able to show a plasticizing effect. The systematization of surfactants for control of structure formation process is offered, basing on the revealed regularities of their efficiency as admixtures depending on basicity of alkaline cement, type of anionic component, degree of rarefaction of cement suspension, stabilization of its consistence and such classification features of surfactants as type of hydrophilic (functional) groups, structure of the carbon chain and molecular weight. The main regularities concerning surfactant influence on technological and physical-mechanical properties of mortars and concretes, as well as principles for their control were revealed.Technological schemes for production of chemically modified alkaline cements composite materials with different functional purposes were developed and realized for lightweight grouts and heavy concretes for frame-monolithic construction. The results of the dissertation work were used in National Standards of Ukraine. Tehnical-economical expedience of the development was confirmed. Industry - building.