Publication detail

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

MATĚJKA, L. ŠILER, P. NOVOTNÝ, R. ŠVEC, J. MÁSILKO, J.

Original Title

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

Type

conference paper

Language

English

Original Abstract

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.

Keywords

Portland cement, Hydration, Zinc, Heavy metals, Isoperibolic calorimetry

Authors

MATĚJKA, L.; ŠILER, P.; NOVOTNÝ, R.; ŠVEC, J.; MÁSILKO, J.

Released

18. 1. 2021

Publisher

IOP Publishing

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

1039

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

9

Pages count

9

URL

https://iopscience.iop.org/article/10.1088/1757-899X/1039/1/012004

Full text in the Digital Library

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"
}