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SPECIFIC FEATURES OF THE FORMATION OF THE MICROSTRUCTURE OF GRANULAR AGGREGATES ON DIFFERENT BINDING COMPOSITIONS (PART 2)
Author(s) -
Liliya Zagorodnyuk,
V. Ryzhih,
D.S. Mahortov,
D. Sinebok
Publication year - 2021
Publication title -
vestnik bgtu im. v.g. šuhova
Language(s) - English
Resource type - Journals
ISSN - 2071-7318
DOI - 10.34031/2071-7318-2021-6-8-17-25
Subject(s) - microstructure , quartz , filler (materials) , dispersion (optics) , composite number , microcrystalline , materials science , crystallization , silicate , mineral , mineralogy , composite material , chemical engineering , chemistry , crystallography , metallurgy , physics , optics , engineering
This article is a continuation of the previous research. It includes analysis of the formation of the structure of granular aggregates during the hydration of the binder composition of BC-2 (PC 500-D0-N + 20 % quartz sand), prepared in a jet vortex mill. The study reveals the features of the dispersion of the quartz mineral filler (fractions ≤0.16; ≤0.315; ≤0.63 mm) and the main patterns of influence on structure formation at hydration of binders, differing in the composition and dispersion of particles. The paper analyzes physical and mechanical tests of the samples with the best strength characteristics and studies the features of their microstructures. The study of the microstructures of the samples reveals regularities, consisting in the formation of crystalline phases of different densities. It is noted that the introduction of 20 % mineral finely dispersed filler into PC 500-D0-N, in the form of quartz sand, ensures the formation of dense sub-microcrystalline hydrate phases when using a filler fraction ≤0.63 mm, which contributes to an increase in the additional strength of the samples by more than 20 %. It has been found that the mineral filler plays the role of crystallization centers, binding individual grains of fillers and sealing general structure of the composite. More compact healing of the pore space has been established for the composite with small crystalline new formations of hydrated calcium silicate

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