Publication detail

Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials

KALINA, L. BÍLEK, V. KIRIPOLSKÝ, T. NOVOTNÝ, R. MÁSILKO, J.

Original Title

Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials

English Title

Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials

Type

journal article in Web of Science

Language

en

Original Abstract

Cement kiln by-pass dust (CKD) is a fine-grained by-product of Portland clinker manufacturing. Its chemical composition is not suitable for returning back into feedstock and, therefore, it has to be discharged. Such an increasing waste production contributes to the high environmental impact of the cement industry. A possible solution for the ecological processing of CKD is its incorporation into alkali-activated blast furnace slag binders. Thanks to high alkaline content, CKD serves as an effective accelerator for latent hydraulic substances which positively affect their mechanical properties. It was found out that CKD in combination with sodium carbonate creates sodium hydroxide in situ which together with sodium water glass content increases the dissolution of blast furnace slag particles and subsequently binder phase formation resulting in better flexural and compressive strength development compared to the sample without it. At the same time, the addition of CKD compensates the autogenous shrinkage of alkali-activated materials reducing the risk of material cracking. On the other hand, this type of inorganic admixture accelerates the hydration process causing rapid loss of workability.

English abstract

Cement kiln by-pass dust (CKD) is a fine-grained by-product of Portland clinker manufacturing. Its chemical composition is not suitable for returning back into feedstock and, therefore, it has to be discharged. Such an increasing waste production contributes to the high environmental impact of the cement industry. A possible solution for the ecological processing of CKD is its incorporation into alkali-activated blast furnace slag binders. Thanks to high alkaline content, CKD serves as an effective accelerator for latent hydraulic substances which positively affect their mechanical properties. It was found out that CKD in combination with sodium carbonate creates sodium hydroxide in situ which together with sodium water glass content increases the dissolution of blast furnace slag particles and subsequently binder phase formation resulting in better flexural and compressive strength development compared to the sample without it. At the same time, the addition of CKD compensates the autogenous shrinkage of alkali-activated materials reducing the risk of material cracking. On the other hand, this type of inorganic admixture accelerates the hydration process causing rapid loss of workability.

Keywords

cement kiln by-pass dust; alkali activation; blast furnace slag; admixture

Released

19.09.2018

Publisher

MDPI

Pages from

1770

Pages to

1770

Pages count

9

URL

Full text in the Digital Library

BibTex


@article{BUT150001,
  author="Lukáš {Kalina} and Vlastimil {Bílek} and Tomáš {Kiripolský} and Radoslav {Novotný} and Jiří {Másilko}",
  title="Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials",
  annote="Cement kiln by-pass dust (CKD) is a fine-grained by-product of Portland clinker manufacturing. Its chemical composition is not suitable for returning back into feedstock and, therefore, it has to be discharged. Such an increasing waste production contributes to the high environmental impact of the cement industry. A possible solution for the ecological processing of CKD is its incorporation into alkali-activated blast furnace slag binders. Thanks to high alkaline content, CKD serves as an effective accelerator for latent hydraulic substances which positively affect their mechanical properties. It was found out that CKD in combination with sodium carbonate creates sodium hydroxide in situ which together with sodium water glass content increases the dissolution of blast furnace slag particles and subsequently binder phase formation resulting in better flexural and compressive strength development compared to the sample without it. At the same time, the addition of CKD compensates the autogenous shrinkage of alkali-activated materials reducing the risk of material cracking. On the other hand, this type of inorganic admixture accelerates the hydration process causing rapid loss of workability.",
  address="MDPI",
  chapter="150001",
  doi="10.3390/ma11091770",
  howpublished="online",
  institution="MDPI",
  number="9",
  volume="11",
  year="2018",
  month="september",
  pages="1770--1770",
  publisher="MDPI",
  type="journal article in Web of Science"
}