5.5 STUDY OF THE INFLUENCE OF ADDITIVES AND MODIFIERS ON THE PROPERTIES OF FINE-GRAINED CONCRETE

Abstract

This paper examines the effect of various chemical and mineral additives, as well as modifiers, on the physical and mechanical properties of fine-grained concrete. Changes in compressive strength, mobility, water resistance, and crack resistance are analyzed when introducing various types of additives, including superplasticizers, microsilica, fly ash, and organic fillers. Particular attention is paid to optimizing the composition in order to improve the durability and cost-effectiveness of the concrete mix. The results of the study make it possible to recommend specific modifying components for use in the production of building elements where improved performance characteristics and a minimum filler size are required.

Key words: fine-grained concrete, additives, modifiers, strength, superplasticizer, microsilica, mobility, durability.

Microscopic examination of concrete samples on natural sand after strength testing shows that in most cases destruction occurs in the filler-cement stone contact zone, as a result of which sand grains are torn out of their "nests" in the cement stone.