Přístupnostní navigace
E-application
Search Search Close
Publication detail
MOKRÁ, J. KULÍSEK, K. GAZDIČ, D. FRIDRICHOVÁ, M.
Original Title
Long-term Observation of Yeelimite Clinker Hydration in Environment of Saturated Water Vapour
Type
conference paper
Language
English
Original Abstract
Due to ecological overloading decrease, industrial by-products are utilized. Fly ash also belongs among these by-products. In Portland-composite cements, the high-temperature fly ash is applied nowadays, but fluidized bed combustion fly ash (FBC fly ash) is not used. The reason is that the FBC fly ash hydrates to form an undesirable ettringite, C3A.3CaSO4.32H2O. Decomposition temperature of ettringite in ambient conditions is most often mentioned in a range of 50 °C to 110 °C. In order to assess the ettringite long-term stability, ettringite was synthesized by hydration of mineral yeelimite, 3CaO.3Al2O3.CaSO4. The aim of this paper is long-term observation of the hydration of yeelimite in environment of saturated water vapour and examination of how stable the products of hydration are under given conditions. Raw materials for preparation of yeelimite were gypsum, limestone and corundum, weighed according to stoichiometric ratio of yeelimite. The mixture was heated at temperature of 1200 °C, soak 3 hours. After quenching and grinding, yeelimite was hydrated with a water-yeelimite ratio of 0.3. The system was cured as pastes and stored in conditions at laboratory temperature and in settings of saturated water vapour (100% R.H.). In order to follow the progress of synthesis regularly, namely up to age of 180 days of hydration, X-ray diffraction (XRD) was chosen using diffractometer Empyrean PANalytical (CuK-alpha). Based on the XRD patterns, only minor part of ettringite was formed, whilst a majority of yeelimite was preserved. It has been found that ettringite was not the only one product of yeelimite hydration. From an age of 20 days of hydration, a small amount of monosulfate was identified, whose quantity rose gradually. Especially at later ages of hydration, transformation of ettringite into monosulfate was observed.
Keywords
Yeeilimite; ettringite; monosulfate; saturated water vapour; bed combustion fly ash
Authors
MOKRÁ, J.; KULÍSEK, K.; GAZDIČ, D.; FRIDRICHOVÁ, M.
Released
3. 8. 2016
Publisher
Elsevier
Location
Černá Hora
ISBN
978-1-5108-2855-1
Book
Ecology and new building materials and products 2016
1877-7058
Periodical
Procedia Engineering
Year of study
151
Number
1
State
Kingdom of the Netherlands
Pages from
94
Pages to
99
Pages count
6
URL
https://www.sciencedirect.com/science/article/pii/S1877705816317738
Full text in the Digital Library
http://hdl.handle.net/11012/204209
BibTex
@inproceedings{BUT127929, author="Jana {Pekárková} and Karel {Kulísek} and Dominik {Gazdič} and Marcela {Fridrichová}", title="Long-term Observation of Yeelimite Clinker Hydration in Environment of Saturated Water Vapour", booktitle="Ecology and new building materials and products 2016", year="2016", journal="Procedia Engineering", volume="151", number="1", pages="94--99", publisher="Elsevier", address="Černá Hora", doi="10.1016/j.proeng.2016.07.385", isbn="978-1-5108-2855-1", issn="1877-7058", url="https://www.sciencedirect.com/science/article/pii/S1877705816317738" }