Publication detail

Durability of alkali-activated concretes containing cement kiln by-pass dust

BÍLEK, V. BÍLEK, V. KALINA, L. KHESTL, F. PALOVČÍK, J. ŠIMONOVÁ, H.

Original Title

Durability of alkali-activated concretes containing cement kiln by-pass dust

English Title

Durability of alkali-activated concretes containing cement kiln by-pass dust

Type

conference paper

Language

en

Original Abstract

The aim of the presented work was evaluation of an effect of various conditions on the performance of two developed concretes based on alkali-activated slag and cement kiln by-pass dust (BD). BD was used as a partial replacement of natural aggregates while slag as an aluminosilicate precursor activated by a combination of waterglass and sodium hydroxide solution (resulting silicate modulus of 0.5). The concretes differed only in an activator dose which was 4 and 6% of Na2O with respect to the slag weight. The prepared specimens were sealed-cured for the first 28 days and then their resistance to freeze-thaw cycles and aggressive solutions (ammonium nitrate, acetic acid and sulphates) was tested. Evolution of dynamic modulus showed that both concretes resisted well to freeze-thaw cycles as well as to most solutions, where their dynamic modulus tended to increase in most cases or did not change significantly. Only the concrete with 4% Na2O showed poor resistance to acetic acid solution as the specimens completely disintegrated until 50 days.

English abstract

The aim of the presented work was evaluation of an effect of various conditions on the performance of two developed concretes based on alkali-activated slag and cement kiln by-pass dust (BD). BD was used as a partial replacement of natural aggregates while slag as an aluminosilicate precursor activated by a combination of waterglass and sodium hydroxide solution (resulting silicate modulus of 0.5). The concretes differed only in an activator dose which was 4 and 6% of Na2O with respect to the slag weight. The prepared specimens were sealed-cured for the first 28 days and then their resistance to freeze-thaw cycles and aggressive solutions (ammonium nitrate, acetic acid and sulphates) was tested. Evolution of dynamic modulus showed that both concretes resisted well to freeze-thaw cycles as well as to most solutions, where their dynamic modulus tended to increase in most cases or did not change significantly. Only the concrete with 4% Na2O showed poor resistance to acetic acid solution as the specimens completely disintegrated until 50 days.

Keywords

alkali-activated slag; durability; freeze-thaw; acetic acid; ammonium nitrate; sulphate; activator dose

Released

18.01.2021

Publisher

IOP Publishing

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

1134

State

GB

Pages from

1

Pages to

8

Pages count

8

URL

Documents

BibTex


@inproceedings{BUT171253,
  author="Vlastimil {Bílek} and Vlastimil {Bílek} and Lukáš {Kalina} and Filip {Khestl} and Jakub {Palovčík} and Hana {Šimonová}",
  title="Durability of alkali-activated concretes containing cement kiln by-pass dust",
  annote="The aim of the presented work was evaluation of an effect of various conditions on
the performance of two developed concretes based on alkali-activated slag and cement kiln
by-pass dust (BD). BD was used as a partial replacement of natural aggregates while slag as
an aluminosilicate precursor activated by a combination of waterglass and sodium hydroxide
solution (resulting silicate modulus of 0.5). The concretes differed only in an activator dose
which was 4 and 6% of Na2O with respect to the slag weight. The prepared specimens were
sealed-cured for the first 28 days and then their resistance to freeze-thaw cycles and aggressive
solutions (ammonium nitrate, acetic acid and sulphates) was tested. Evolution of dynamic
modulus showed that both concretes resisted well to freeze-thaw cycles as well as to most
solutions, where their dynamic modulus tended to increase in most cases or did not change
significantly. Only the concrete with 4% Na2O showed poor resistance to acetic acid solution
as the specimens completely disintegrated until 50 days.",
  address="IOP Publishing",
  booktitle="International Conference Building Materials, Products and Technologies",
  chapter="171253",
  doi="10.1088/1757-899X/1039/1/012012",
  howpublished="online",
  institution="IOP Publishing",
  year="2021",
  month="january",
  pages="1--8",
  publisher="IOP Publishing",
  type="conference paper"
}