Pasko A. Eco-concrete based on alkali activated cements using iron-containing industrial by-products

The object of the research is directed regulation of the physico-chemical effect on the processes of the structure formation of high volume iron-containing industrial by-products alkaline cements and eco-concrete and ensuring their high environmental friendliness and efficiency in use. The subject of the research is eco-concrete based on alkaline cement using iron-containing industrial by-products. Research methods - modern methods of physical and chemical analysis; statistical methods of experiment planning. Investigation of the immobilizing and radiological properties of alkaline cements and eco-concrete based on them was carried out according to the European standard (EN 12457-1: 2002 Part 1). Novelty - for the first time theoretically substantiated and experimentally confirmed on the model systems the possibility of binding of various iron compounds in insoluble forms with the provision of both physical and mechanical properties of alkaline cement hardened stone and the reduction of the ability of iron compounds to leaching. The processes of the structure formation of alkaline cements using red and galvanic slurries with controlled formation of stable zeolite-like new formations and insoluble iron-containing compounds were established. The possibility of obtaining alkaline cements using such iron containing industrial by-products had been proved. The relationship between the strength of the hardened cement stone and the amount of iron-containing products and the anionic part of alkaline component was done. The dependence of the ability of alkali activated cements to immobilize various iron compounds and heavy metals (Pb+, Ni+) present in red mud and wastewater treatment from the composite structure of such cements is shown. Physico-chemical, mechanical and technological basis of composite structure of concrete mix composition with regulated constructional-technological properties and maximum content of iron-containing industrial by-products according to criterion of functionality of concrete mixture, early and late compressive strength, porosity, freeze-thaw and corrosion resistances. The results of the work were applied in the production of building materials. The ecological feasibility of the work is determined. Industry - construction.