CEMENT MORTARS MODIFIED WITH DISCRETE FIBERS

Abstract

One of the modern approaches to improving the performance characteristics of cementitious binders is their modification with discrete fibers, which provides comprehensive improvement of the material structure. The main concept involves the introduction of synthetic or mineral fibers into the mortar, which act as micro-reinforcement and allow for a significant improvement in the physical and mechanical properties of the finished stone. Such fibers reduce shrinkage deformations, prevent the formation of microcracks at early stages of curing and ensure an even distribution of stresses within the cement stone. It gives the key to increase the material flexural toughness, crack resistance and durability, which is particularly important for repair and restoration work.

The purpose of this study is to identify the patterns of structure formation in cement stone modified with discrete fibers of various origins and geometric parameters, as well as to improve its physical and mechanical properties by optimizing the mortar composition. The study examines the influence of fiber length, diameter and concentration on the cement hydration process, the rate of crystalline structure formation and the final strength characteristics. The findings indicate that fibers introduced in specific amounts act as concrete reinforcement fibers and can change the morphology of hydrate crystals, thereby forming a denser and more anti-cracking structure.

The scientific novelty of the study lies in establishing correlations between the parameters of discrete fibers and the microstructural characteristics of the final material, as well as in developing a model that describes the mechanism by which fibers influence the structure of the cement stone. The practical relevance of the study lies in the possibility of purposefully adjusting the composition of cement mortars to achieve the optimal balance of strength, crack resistance and deformation characteristics. The results open up prospects for the development of a new generation of repair and construction materials with enhanced operational reliability, which is especially important for modern construction and the reconstruction of facilities.