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Use of binders with low water demand opens prospects for obtaining high-performance concretes. A polyfunctional modifier based on resol-type resorcinol-furfural oligomers allows one to obtain binders with low water demand and high specific surface area, compressive strength, and waterreducing ability. This research demonstrates that a more intensive strength development for 1-2 days of curing is observed in concretes based on low water demand binders compared to the reference sample. During this process, a denser microcrystalline structure with no large-grained formations or visible defects is formed. It was proved that introduction of the optimum quantity of the modifier into a binder completely suppresses mold growth. Isolates of Aspergillus niger and Penicillium chrisogenum Thom fungi were used as the biological deterioration factor for specimen. Assessment of antifungal properties of resorcinolfurfural oligomers on a six-point scale (sample/environment) is presented. Strength properties of the concrete with the modifier in question are significantly increased due to the decrease of the water-cement ratio, the reduction of microfractures within the concrete, higher density of its structure, and absence of biocorrosion. The resorcinol-furfural polyfunctional modifier can be used to produce innovative high-strength materials for use in additive manufacturing and further use of the produced articles in biologically active environments. Keywords— high-performance concrete; low water demand binder; water-reducing ability; antifungal properties; biocorrosion.

Polyfunctional modifier for bio-corrosion resistant high-performance fine-aggregate concretes