Publication detail

Reduction of concrete´s shrinkage by controlled formation of monosulphate and trisulphate

ŤAŽKÝ, M. HELA, R. OSUSKÁ, L. BODNÁROVÁ, L.

Original Title

Reduction of concrete´s shrinkage by controlled formation of monosulphate and trisulphate

English Title

Reduction of concrete´s shrinkage by controlled formation of monosulphate and trisulphate

Type

conference proceedings

Language

en

Original Abstract

Concrete’s volumetric changes are natural process caused by silicate minerals’ hydration. These changes can lead to cracking and subsequent destruction of cementitious material’s matrix. In most cases, cracks can be assessed as a negative effect of hydration and in all cases they lead to acceleration of degradation processes. Preventing the formation of these cracks is therefore the main effort. Mono- and trisulfate’s controlled formation in cementitious composite can be classified as a self-healing ability. Its crystal’s growth acts directly against the shrinking tension – this reduces the risk of cracks development. Controlled formation means that these crystals start to grow in the fresh state of material (e.g. concrete) but stops right before it could cause any damage to the hardened material. Waste materials with suitable chemical composition are very attractive precursors because of their added value in the form of landscape pollution’s reduction and, of course, low cost. In this experiment, the possibilities of using the fly ash from fluidized bed combustion as a mono- and trisulfate’s formation additive were investigated. The experiment itself was conducted on cement paste and concrete and specimens were subjected to a thorough analysis of physico-mechanical properties as well as microstructure from the moment of mixing up to 180 days.

English abstract

Concrete’s volumetric changes are natural process caused by silicate minerals’ hydration. These changes can lead to cracking and subsequent destruction of cementitious material’s matrix. In most cases, cracks can be assessed as a negative effect of hydration and in all cases they lead to acceleration of degradation processes. Preventing the formation of these cracks is therefore the main effort. Mono- and trisulfate’s controlled formation in cementitious composite can be classified as a self-healing ability. Its crystal’s growth acts directly against the shrinking tension – this reduces the risk of cracks development. Controlled formation means that these crystals start to grow in the fresh state of material (e.g. concrete) but stops right before it could cause any damage to the hardened material. Waste materials with suitable chemical composition are very attractive precursors because of their added value in the form of landscape pollution’s reduction and, of course, low cost. In this experiment, the possibilities of using the fly ash from fluidized bed combustion as a mono- and trisulfate’s formation additive were investigated. The experiment itself was conducted on cement paste and concrete and specimens were subjected to a thorough analysis of physico-mechanical properties as well as microstructure from the moment of mixing up to 180 days.

Keywords

shrinkage, monosulphate, trisuplhpate, self-healing, fluidized fly ash, ...

Released

28.11.2016

Publisher

TuDelft

Location

Deft, The Netherladn

Pages from

1

Pages to

4

Pages count

4

Documents

BibTex


@proceedings{BUT131374,
  author="Martin {Ťažký} and Rudolf {Hela} and Lucia {Ťažká} and Lenka {Bodnárová}",
  title="Reduction of concrete´s shrinkage by controlled formation of monosulphate and trisulphate",
  annote="Concrete’s volumetric changes are natural process caused by silicate minerals’
hydration. These changes can lead to cracking and subsequent destruction of
cementitious material’s matrix. In most cases, cracks can be assessed as a negative
effect of hydration and in all cases they lead to acceleration of degradation
processes. Preventing the formation of these cracks is therefore the main effort.
Mono- and trisulfate’s controlled formation in cementitious composite can be
classified as a self-healing ability. Its crystal’s growth acts directly against the
shrinking tension – this reduces the risk of cracks development. Controlled formation
means that these crystals start to grow in the fresh state of material (e.g. concrete)
but stops right before it could cause any damage to the hardened material. Waste
materials with suitable chemical composition are very attractive precursors because
of their added value in the form of landscape pollution’s reduction and, of course, low
cost.
In this experiment, the possibilities of using the fly ash from fluidized bed combustion
as a mono- and trisulfate’s formation additive were investigated. The experiment itself
was conducted on cement paste and concrete and specimens were subjected to a
thorough analysis of physico-mechanical properties as well as microstructure from
the moment of mixing up to 180 days.",
  address="TuDelft",
  chapter="131374",
  howpublished="electronic, physical medium",
  institution="TuDelft",
  year="2016",
  month="november",
  pages="1--4",
  publisher="TuDelft",
  type="conference proceedings"
}