R&D result detail

Original Title

The influence of ferrous sulphate on Portland clinker hydration

English Title

The influence of ferrous sulphate on Portland clinker hydration

Type

Abstract

Original Abstract

The issue of hexavalent chromium toxicity in Portland cement hydration is very topical at present. It takes a lot of effort to obtain cements containing Cr(VI) less than 2 ppm. The primary goal of this thesis was to explore the influence of a substance which could reduce hexavalent chromium and at the same time retard the hydration of Portland clinker. It is a very important fact because Portland clinker after mixing with water starts to harden immediately. The substance, which has these properties, is ferrous sulphate. The reduction ability was determined by UV/VIS method. The concentration of hexavalent chromium leaching is significantly lower with the addition of a very small amount of ferrous salt. The calorimetric measure showed that ferrous sulphate can be used as a retarder substance in the hydration of Portland clinker. This fact involves the presence of sulphate anions. The next measurements performed were the strength tests. Their results showed the decrease in the strength when compared with the strength of Portland cement. The hydration products of Portland clinker after the gypsum replacement by ferrous sulphate were also investigated. The goal of this study was to identify the hydration products which result in the retard hydration. The presence of these products was determined by XRD method and Raman microscopy.

English abstract

The issue of hexavalent chromium toxicity in Portland cement hydration is very topical at present. It takes a lot of effort to obtain cements containing Cr(VI) less than 2 ppm. The primary goal of this thesis was to explore the influence of a substance which could reduce hexavalent chromium and at the same time retard the hydration of Portland clinker. It is a very important fact because Portland clinker after mixing with water starts to harden immediately. The substance, which has these properties, is ferrous sulphate. The reduction ability was determined by UV/VIS method. The concentration of hexavalent chromium leaching is significantly lower with the addition of a very small amount of ferrous salt. The calorimetric measure showed that ferrous sulphate can be used as a retarder substance in the hydration of Portland clinker. This fact involves the presence of sulphate anions. The next measurements performed were the strength tests. Their results showed the decrease in the strength when compared with the strength of Portland cement. The hydration products of Portland clinker after the gypsum replacement by ferrous sulphate were also investigated. The goal of this study was to identify the hydration products which result in the retard hydration. The presence of these products was determined by XRD method and Raman microscopy.

Keywords

portland clinker, ferrous sulphate

Key words in English

portland clinker, ferrous sulphate

Authors

HAJDÚCHOVÁ, M.; ŠOUKAL, F.

RIV year

2014

Released

06.12.2013

Publisher

Vysoké učení technické v Brně, Fakulta chemická, Purkyňova 464/118, 612 00 Brno

ISBN

978-80-214-4822-3

Book

Sborník abstraktů

Pages from

77

Pages to

77

Pages count

1

BibTex

@misc{BUT106986,
  author="Miroslava {Mončeková} and František {Šoukal}",
  title="The influence of ferrous sulphate on Portland clinker hydration",
  booktitle="Sborník abstraktů",
  year="2013",
  edition="první",
  pages="77--77",
  publisher="Vysoké učení technické v Brně, Fakulta chemická, Purkyňova 464/118, 612 00 Brno",
  isbn="978-80-214-4822-3",
  note="Abstract"
}