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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216224:14310/23:00131686

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 &quot;spontaneous pure hydration&quot;, 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 &quot;spontaneous pure hydration&quot;, 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Case Studies in Construction Materials

ISSN

2214-5095

e-ISSN

2214-5095

Svazek periodika

neuveden

Číslo periodika v rámci svazku

18

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

21

Strana od-do

—

Kód UT WoS článku

000946593800001

EID výsledku v databázi Scopus

2-s2.0-85147852009