The Influence of Secondary Raw Materials on Tobermorite Formation in Calcium-Silicate Composites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F18%3APU130249" target="_blank" >RIV/00216305:26110/18:PU130249 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.wasteforum.cz/cisla/WF_4_2018.pdf" target="_blank" >http://www.wasteforum.cz/cisla/WF_4_2018.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The Influence of Secondary Raw Materials on Tobermorite Formation in Calcium-Silicate Composites

Popis výsledku v původním jazyce

The physical-mechanical properties of calcium-silicate composites depend on their microstructure, which itself, in autoclaved aerated concrete especially, depends on the formation and morphology of the calcium hydrosilicate phases. The main one of these phases is tobermorite, which is what this paper is focused on. Two secondary raw materials representing two main groups of by-products are discussed. Namely, these are fluidized bed combustion fly ash and slag produced by the incineration and power plants. Studying the utilisation of secondary raw materials has become a necessity for both environmental and financial reasons. Selected raw materials were mixed with lime only. In this way, the conditions eliminating the effects of other impurities were ensured. The material’s molar ratio of calcium oxide to silicon dioxide was 0.73 and 1.0. The material samples were then autoclaved at two temperatures (170 and 190 °C) and three different hydrothermal durations (4, 8 and 16 hours). The results indicate that slag appears to be promising material. Samples containing slag reached the same compressive strength as reference samples at 190°C with a molar C/S ratio of 0.73.

Název v anglickém jazyce

The Influence of Secondary Raw Materials on Tobermorite Formation in Calcium-Silicate Composites

Popis výsledku anglicky

The physical-mechanical properties of calcium-silicate composites depend on their microstructure, which itself, in autoclaved aerated concrete especially, depends on the formation and morphology of the calcium hydrosilicate phases. The main one of these phases is tobermorite, which is what this paper is focused on. Two secondary raw materials representing two main groups of by-products are discussed. Namely, these are fluidized bed combustion fly ash and slag produced by the incineration and power plants. Studying the utilisation of secondary raw materials has become a necessity for both environmental and financial reasons. Selected raw materials were mixed with lime only. In this way, the conditions eliminating the effects of other impurities were ensured. The material’s molar ratio of calcium oxide to silicon dioxide was 0.73 and 1.0. The material samples were then autoclaved at two temperatures (170 and 190 °C) and three different hydrothermal durations (4, 8 and 16 hours). The results indicate that slag appears to be promising material. Samples containing slag reached the same compressive strength as reference samples at 190°C with a molar C/S ratio of 0.73.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA17-14198S" target="_blank" >GA17-14198S: Kinetika tvorby mikrostruktury silikátů v závislosti na hydrotermálních podmínkách a typu vstupních surovin</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Waste forum

ISSN

1804-0195

e-ISSN

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Svazek periodika

2018

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

9

Strana od-do

467-475

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85060051683