Negative effect of Zinc compounds on hydration kinetics of ordinary Portland cement

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F21%3APU137892" target="_blank" >RIV/00216305:26310/21:PU137892 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1757-899X/1039/1/012004" target="_blank" >https://iopscience.iop.org/article/10.1088/1757-899X/1039/1/012004</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1757-899X/1039/1/012004" target="_blank" >10.1088/1757-899X/1039/1/012004</a>

Result language
angličtina
Original language name
Negative effect of Zinc compounds on hydration kinetics of ordinary Portland cement
Original language description
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.
Czech name
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Czech description
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Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
International Conference Building Materials, Products and Technologies
ISBN
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ISSN
1757-8981
e-ISSN
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Number of pages
9
Pages from-to
1-9
Publisher name
IOP Publishing
Place of publication
neuveden
Event location
Telč
Event date
Jun 2, 2020
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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