Formation of belite-based binder from waste materials

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F20%3AN0000043" target="_blank" >RIV/26232511:_____/20:N0000043 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs10973-020-10252-6" target="_blank" >https://link.springer.com/article/10.1007%2Fs10973-020-10252-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-020-10252-6" target="_blank" >10.1007/s10973-020-10252-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Formation of belite-based binder from waste materials

Popis výsledku v původním jazyce

The present work deals with the preparation of belite-based binders using a mixture of sludge waste from mining and washing of limestone (source of CaCO3 and SiO2), and waste material from acetylene gas cylinders filler containing hydrosilicates—tobermorite and xonotlite. These wastes are of suitable oxide composition for the preparation of belite cements. The materials were mixed together in different proportions and burned at temperatures from 700 to 1300 °C. 3% K2O was used as dopant to stabilize the reactive belite modification. The main interest was focused on the process of belite formation related to its reactivity. During burning of waste material mixtures, limestone is decomposed providing CaO, while tobermorite and xonotlite are transformed into wollastonite. Then, belite is formed by reaction of SiO2 and CaO, as it is typical in Portland clinker, but also by reaction of wollastonite and CaO. The process of belite formation influences its hydraulic properties to a great extent. Carbonation of calcium silicates was studied as well. Phase composition of burned products was studied by X-ray powder diffraction. Hydration and carbonation products were identified by differential thermal analysis. It was confirmed that the content of rankinite has a significant effect on CO2 uptake. Carbonation rate was also positively affected by a higher wollastonite content.

Název v anglickém jazyce

Formation of belite-based binder from waste materials

Popis výsledku anglicky

The present work deals with the preparation of belite-based binders using a mixture of sludge waste from mining and washing of limestone (source of CaCO3 and SiO2), and waste material from acetylene gas cylinders filler containing hydrosilicates—tobermorite and xonotlite. These wastes are of suitable oxide composition for the preparation of belite cements. The materials were mixed together in different proportions and burned at temperatures from 700 to 1300 °C. 3% K2O was used as dopant to stabilize the reactive belite modification. The main interest was focused on the process of belite formation related to its reactivity. During burning of waste material mixtures, limestone is decomposed providing CaO, while tobermorite and xonotlite are transformed into wollastonite. Then, belite is formed by reaction of SiO2 and CaO, as it is typical in Portland clinker, but also by reaction of wollastonite and CaO. The process of belite formation influences its hydraulic properties to a great extent. Carbonation of calcium silicates was studied as well. Phase composition of burned products was studied by X-ray powder diffraction. Hydration and carbonation products were identified by differential thermal analysis. It was confirmed that the content of rankinite has a significant effect on CO2 uptake. Carbonation rate was also positively affected by a higher wollastonite content.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

1588-2926

Svazek periodika

142

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

9

Strana od-do

1625-1633

Kód UT WoS článku

000578564600002

EID výsledku v databázi Scopus

2-s2.0-85092381552