Open AccessSTRUCTURE FORMATION OF DISPERSED-REINFORCED BUILDING COMPOSITES
Author(s) -
A.D. Dovgan,
AUTHOR_ID,
Valery Vyrovoy,
AUTHOR_ID
Publication year - 2021
Publication title -
vìsnik odesʹkoï deržavnoï akademìï budìvnictva ta arhìtekturi
Language(s) - English
Resource type - Journals
ISSN - 2415-377X
DOI - 10.31650/2415-377x-2021-85-71-78
Subject(s) - materials science , composite material , microstructure , particle (ecology) , cracking , dispersion (optics) , fiber , composite number , structure formation , cement , aggregate (composite) , oceanography , physics , quantum mechanics , galaxy , optics , geology
. The results of the study of the mechanism of structure formation of cement compositions reinforced with finely dispersed monofilament are presented in the article. The mechanism of microstructure organization of construction composites was studied on models of dispersed systems, with different qualitative and quantitative composition of linear and dispersed particles. At the same time, restrictions had been placed on particle size – fiber diameter and diameter of dispersed particles are proportional to each other. Study of cracking formation kinetics was carried out on disk-shaped samples made of water-clay and water-cement compositions. Physical and mechanical characteristics of dispersed-reinforced cement stone, including non-reinforced stone, have been defined on prisms-shaped samples of square section with size 40×40×160 mm. The analysis of physical models showed that cluster structures filling with particles of various nature and shape increases structural diversity of entire dispersed system. An inserting of linear particles changes nature of system structure formation. Depending on the characteristics, structural components of the system, substructures are formed, which differ in the periods of their formation and geometric parameters. It has been established that dispersed particles of different nature are structured in different ways into clusters with discrete fibers of different length. Linear particles were more active in the creation of structural aggregates (clusters) comparing to dispersed grains. The impact of highly dispersed fibers on the structure organization of the binder compositions was quantified by the damage coefficient determined on samples of different types. The presence of discrete fibers in the composition of the material leads to modify the qualitative characteristic of compositions cracking formation. Improvement of physical and mechanical properties of the dispersed-reinforced composite confirms the ability of the fiber to change a mechanism of material destruction due to a probable deposition of hydration products on monofilaments, to densify and strengthen the interfacial transitional zone.