Microstructural and permeability properties of alkali-activated slag concrete

Tarja Häkkinen, Hannu Pyy, Pertti Koskinen

Research output: Book/ReportReport

1 Citation (Scopus)

Abstract

The study consists of a series of experimental investigations concerning the microstructural and permeability properties of alkali-activated slag concrete. The object of study is the so-called F-concrete. F-cement is finely ground slag to be activated by a combination of alkali metal compounds and rendered consistent in its fresh state by means of ligno-sulphonates. The influence of different parameters on the structure of F-concrete was studied by means of thermal analysis, X-ray diffraction and mercury intrusion. In addition, strength properties and permeability properties were studied. The influence of slag binder on chloride penetration and on carbonation was investigated. The permeability properties of F-concrete were also studied by means of capillary suction, water penetration and gas penetration. The parameters considered in the experimental studies were the quality of slag and additive, the proportion of concrete constituents and the curing conditions of the concrete specimens. According to the results the hardened slag paste is very dense, but the structure contains microscopic cracks due to hydration shrinkage. The effect of the cracks on the permeability properties was found to be significant. On the basis of strength results it is possible to produce F-concrete with very good mechanical properties.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages110
ISBN (Print)951-38-2918-9
Publication statusPublished - 1987
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number486
ISSN0358-5077

Fingerprint

Slags
Concretes
Alkali metal compounds
Cracks
Carbonation
Hydration
Thermoanalysis
Binders
Curing
Cements
X ray diffraction
Mechanical properties
Gases
Water

Keywords

  • slag concrete
  • slag cements
  • F-concrete
  • concrete durability
  • microstructure
  • alkali aggregates
  • permeability

Cite this

Häkkinen, T., Pyy, H., & Koskinen, P. (1987). Microstructural and permeability properties of alkali-activated slag concrete. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 486
Häkkinen, Tarja ; Pyy, Hannu ; Koskinen, Pertti. / Microstructural and permeability properties of alkali-activated slag concrete. Espoo : VTT Technical Research Centre of Finland, 1987. 110 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 486).
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Häkkinen, T, Pyy, H & Koskinen, P 1987, Microstructural and permeability properties of alkali-activated slag concrete. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 486, VTT Technical Research Centre of Finland, Espoo.

Microstructural and permeability properties of alkali-activated slag concrete. / Häkkinen, Tarja; Pyy, Hannu; Koskinen, Pertti.

Espoo : VTT Technical Research Centre of Finland, 1987. 110 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 486).

Research output: Book/ReportReport

TY - BOOK

T1 - Microstructural and permeability properties of alkali-activated slag concrete

AU - Häkkinen, Tarja

AU - Pyy, Hannu

AU - Koskinen, Pertti

PY - 1987

Y1 - 1987

N2 - The study consists of a series of experimental investigations concerning the microstructural and permeability properties of alkali-activated slag concrete. The object of study is the so-called F-concrete. F-cement is finely ground slag to be activated by a combination of alkali metal compounds and rendered consistent in its fresh state by means of ligno-sulphonates. The influence of different parameters on the structure of F-concrete was studied by means of thermal analysis, X-ray diffraction and mercury intrusion. In addition, strength properties and permeability properties were studied. The influence of slag binder on chloride penetration and on carbonation was investigated. The permeability properties of F-concrete were also studied by means of capillary suction, water penetration and gas penetration. The parameters considered in the experimental studies were the quality of slag and additive, the proportion of concrete constituents and the curing conditions of the concrete specimens. According to the results the hardened slag paste is very dense, but the structure contains microscopic cracks due to hydration shrinkage. The effect of the cracks on the permeability properties was found to be significant. On the basis of strength results it is possible to produce F-concrete with very good mechanical properties.

AB - The study consists of a series of experimental investigations concerning the microstructural and permeability properties of alkali-activated slag concrete. The object of study is the so-called F-concrete. F-cement is finely ground slag to be activated by a combination of alkali metal compounds and rendered consistent in its fresh state by means of ligno-sulphonates. The influence of different parameters on the structure of F-concrete was studied by means of thermal analysis, X-ray diffraction and mercury intrusion. In addition, strength properties and permeability properties were studied. The influence of slag binder on chloride penetration and on carbonation was investigated. The permeability properties of F-concrete were also studied by means of capillary suction, water penetration and gas penetration. The parameters considered in the experimental studies were the quality of slag and additive, the proportion of concrete constituents and the curing conditions of the concrete specimens. According to the results the hardened slag paste is very dense, but the structure contains microscopic cracks due to hydration shrinkage. The effect of the cracks on the permeability properties was found to be significant. On the basis of strength results it is possible to produce F-concrete with very good mechanical properties.

KW - slag concrete

KW - slag cements

KW - F-concrete

KW - concrete durability

KW - microstructure

KW - alkali aggregates

KW - permeability

M3 - Report

SN - 951-38-2918-9

T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports

BT - Microstructural and permeability properties of alkali-activated slag concrete

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Häkkinen T, Pyy H, Koskinen P. Microstructural and permeability properties of alkali-activated slag concrete. Espoo: VTT Technical Research Centre of Finland, 1987. 110 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 486).