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MATĚJKA, L. ŠILER, P. NOVOTNÝ, R. ŠVEC, J. MÁSILKO, J.
Originální název
Negative effect of Zinc compounds on hydration kinetics of ordinary Portland cement
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
angličtina
Originální abstrakt
Heavy metals have significant effect on cement hydration mechanism and kinetics. The recycling of waste materials leads to increase of content of heavy metals in various industrial products and visibly affects properties of the Portland cement. One of the heavy metals that has been known to drastically increase the setting time is Zinc. Zinc forms various hydroxyl species with calcium cations. Pore solution thus has lowered concentration of calcium which suppresses formation of portlandite. Due to insufficient concentration of calcium the formation of CSH gel and further hydration of clinker grains is inhibited The aim of this study is to quantify the negative effects of Zinc at different concentrations at ambient temperature of 20 °C. Isoperibolic calorimetry was used to measure the negative effects of zinc on hydration kinetics of ordinary Portland cement. Zinc was added to the cement in the form of two soluble salts of Zn(NO3)2 hydrate, ZnCl2 and a poorly soluble compound ZnO. The concentration of zinc added was chosen between 0.1 and 1 mass % of clinker. Significant retardation of cement hydration with increasing zinc content was proven.
Klíčová slova
Portland cement, Hydration, Zinc, Heavy metals, Isoperibolic calorimetry
Autoři
MATĚJKA, L.; ŠILER, P.; NOVOTNÝ, R.; ŠVEC, J.; MÁSILKO, J.
Vydáno
18. 1. 2021
Nakladatel
IOP Publishing
ISSN
1757-8981
Periodikum
IOP Conference Series: Materials Science and Engineering
Ročník
1039
Číslo
1
Stát
Spojené království Velké Británie a Severního Irska
Strany od
Strany do
9
Strany počet
URL
https://iopscience.iop.org/article/10.1088/1757-899X/1039/1/012004
Plný text v Digitální knihovně
http://hdl.handle.net/11012/201779
BibTex
@inproceedings{BUT166142, author="Lukáš {Matějka} and Pavel {Šiler} and Radoslav {Novotný} and Jiří {Švec} and Jiří {Másilko} and František {Šoukal}", title="Negative effect of Zinc compounds on hydration kinetics of ordinary Portland cement", booktitle="International Conference Building Materials, Products and Technologies", year="2021", journal="IOP Conference Series: Materials Science and Engineering", volume="1039", number="1", pages="1--9", publisher="IOP Publishing", doi="10.1088/1757-899X/1039/1/012004", issn="1757-8981", url="https://iopscience.iop.org/article/10.1088/1757-899X/1039/1/012004" }