Synthesis of β-C2S-based binder from limestone and calcium silicate wastes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F19%3AN0000052" target="_blank" >RIV/26232511:_____/19:N0000052 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10973-019-08521-0" target="_blank" >https://link.springer.com/article/10.1007/s10973-019-08521-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-019-08521-0" target="_blank" >10.1007/s10973-019-08521-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Synthesis of β-C2S-based binder from limestone and calcium silicate wastes

Popis výsledku v původním jazyce

The present paper deals with the preparation of eco-friendly and low-energy cementitious binders using industrial by-products or materials based on waste sludge from mining and washing of limestone. Supplementary raw material containing mainly tobermorite and xonotlite is the waste of calcium silicate materials used as porous filling material of acetylene gas cylinders. Mixtures of raw materials were calcined at temperature 1150 °C for 120 min. Hydration products were characterized by thermogravimetric analysis (TG/DTA) and by X-ray diffraction. The heat of hydration of binder was investigated by means of isothermal calorimeter. Other techniques, such as scanning electron microscopy, were also used to characterize the microstructure. The compressive strength of pastes cured standard conditions was lower than 5 MPa even during 90 days. After pre-curing during 2, 5 and 7 days, samples were submitted to the hydrothermal curing at 170 °C for 24 h. Samples developed much higher compressive strengths (30 MPa). The formation of α-C2SH and γ-C2S was observed in samples after autoclaving. Pre-curing duration and hydrothermal curing conditions significantly influence the performances of cementitious materials.

Název v anglickém jazyce

Synthesis of β-C2S-based binder from limestone and calcium silicate wastes

Popis výsledku anglicky

The present paper deals with the preparation of eco-friendly and low-energy cementitious binders using industrial by-products or materials based on waste sludge from mining and washing of limestone. Supplementary raw material containing mainly tobermorite and xonotlite is the waste of calcium silicate materials used as porous filling material of acetylene gas cylinders. Mixtures of raw materials were calcined at temperature 1150 °C for 120 min. Hydration products were characterized by thermogravimetric analysis (TG/DTA) and by X-ray diffraction. The heat of hydration of binder was investigated by means of isothermal calorimeter. Other techniques, such as scanning electron microscopy, were also used to characterize the microstructure. The compressive strength of pastes cured standard conditions was lower than 5 MPa even during 90 days. After pre-curing during 2, 5 and 7 days, samples were submitted to the hydrothermal curing at 170 °C for 24 h. Samples developed much higher compressive strengths (30 MPa). The formation of α-C2SH and γ-C2S was observed in samples after autoclaving. Pre-curing duration and hydrothermal curing conditions significantly influence the performances of cementitious materials.

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

2019

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

—

Číslo periodika v rámci svazku

138

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

3

Strana od-do

1901-1912

Kód UT WoS článku

000494046600007

EID výsledku v databázi Scopus

2-s2.0-85069683398