Changes in the Chemical Composition of Silica Fume in the Concrete Composite System

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44994575%3A_____%2F23%3A10001670" target="_blank" >RIV/44994575:_____/23:10001670 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/23:00131686
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S2214509523000955?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2214509523000955?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cscm.2023.e01916" target="_blank" >10.1016/j.cscm.2023.e01916</a>

Result language
angličtina
Original language name
Changes in the Chemical Composition of Silica Fume in the Concrete Composite System
Original language description
The paper demonstrates a spontaneous change in the micro-chemical composition of silica fumemicropellets in a composite system of concretes with pozzolans admixtures. For 18 years, concretewas modified in laboratory conditions only with the use of drinking water. Using quantitativetechniques of scanning electron microscopy (SEM) and microanalysis (EDX), the paper presentsresults of a hydration analysis of concrete prepared according to three different recipes fromPortland cement mixed with silica fume and slag. Hydration and changes in the chemicalcomposition of the silica fume micropellets were evaluated over a time-frame of 0, 5, 15, 18 years.The paper describes "spontaneous pure hydration", during which compaction and change of themicro-chemical composition, density and chemical composition occur in two differentmorphology types of silica fume micropellets. The experiment confirmed the preventive effect ofsilica fume micropellets on the course of expansion reactions in concrete structures. Even after 18years, no expansive alkaline silica gels were identified in the concrete. Silica fume has a positiveeffect on the speed of the expanding alkali-silica reaction, which, even at very low content (2 %),it slows down.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20102 - Construction engineering, Municipal and structural engineering

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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