Material properties of F-concrete at high temperatures

Ulla-Maija Jumppanen, Ulrich Diederichs, Konrad Hinrichsmeyer

Research output: Book/ReportReport

Abstract

F-cement is a binder for concrete based on finely ground granulated blast furnace slag activated with an alkaline admixture. The base material consists mainly of Ca-silicates of considerably lower CaO/SiO2-ratio than ordinary Portland Cement (OPC) clinker. It has a lower water requirement than pure clinker, it liberates little or no Ca(OH)2 during hydration and the liquidising effect of superplasticizers is much stronger than on OPC clinker. This leads to a different mineralogical and structural composition of the cement paste that significantly influences the thermal behaviour of the concrete. It has been necessary to investigate the properties of F-concrete also at hightemperatures to answer the question whether concrete members and structures madewith F-concrete indicate the same fire safety level as those made with OPC-concrete. This paper reports the results of investigations of the behaviour of F-concrete at elevated temperatures and parallel investigations of OPC-concretes of comparable mix design comprising thermal stability and strength and deformation behaviour. The thermal stability has been investigated concerning deterioration reactions bythe aid of DIA, alteration of the microstructure by the aid of N2-sorption and mercury porosimetry as well as thermal expansion. The mechanical properties of the concretes at high temperatures have been studied by determining the sigma, epsilon-relationships both with steady state and transient tests (transient strains and restraint forces), the latter simulating more realistically real fire conditions. Using the concept of "normalised transient strain" it is shown that the transient strain depends linearly on the load level up to an ultimate value. All the concretes behaved nearly in the same way up to a temperature of almost 350 °C. Owing to a different mineralogical and structural composition (especially low Ca(OH)2-content), the F-concrete indicates in many respects a more advantageous high temperature behaviour than OPC-concretes. Strong increase in transient strain and loss of strength occur first above 600 °C.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages230
ISBN (Print)951-38-2649-X
Publication statusPublished - 1986
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number452
ISSN0358-5077

Fingerprint

Materials properties
Concretes
Portland cement
Temperature
Cements
Fires
Thermodynamic stability
Chemical analysis
Hydration
Slags
Silicates
Binders
Thermal expansion
Deterioration
Sorption
Loads (forces)
Mechanical properties
Microstructure

Keywords

  • cements
  • cement paste
  • concrete
  • slag cements
  • slag concrete
  • blast furnace slage
  • admixtures
  • portland cements
  • high temperature
  • clinker

Cite this

Jumppanen, U-M., Diederichs, U., & Hinrichsmeyer, K. (1986). Material properties of F-concrete at high temperatures. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 452
Jumppanen, Ulla-Maija ; Diederichs, Ulrich ; Hinrichsmeyer, Konrad. / Material properties of F-concrete at high temperatures. Espoo : VTT Technical Research Centre of Finland, 1986. 230 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 452).
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Jumppanen, U-M, Diederichs, U & Hinrichsmeyer, K 1986, Material properties of F-concrete at high temperatures. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 452, VTT Technical Research Centre of Finland, Espoo.

Material properties of F-concrete at high temperatures. / Jumppanen, Ulla-Maija; Diederichs, Ulrich; Hinrichsmeyer, Konrad.

Espoo : VTT Technical Research Centre of Finland, 1986. 230 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 452).

Research output: Book/ReportReport

TY - BOOK

T1 - Material properties of F-concrete at high temperatures

AU - Jumppanen, Ulla-Maija

AU - Diederichs, Ulrich

AU - Hinrichsmeyer, Konrad

PY - 1986

Y1 - 1986

N2 - F-cement is a binder for concrete based on finely ground granulated blast furnace slag activated with an alkaline admixture. The base material consists mainly of Ca-silicates of considerably lower CaO/SiO2-ratio than ordinary Portland Cement (OPC) clinker. It has a lower water requirement than pure clinker, it liberates little or no Ca(OH)2 during hydration and the liquidising effect of superplasticizers is much stronger than on OPC clinker. This leads to a different mineralogical and structural composition of the cement paste that significantly influences the thermal behaviour of the concrete. It has been necessary to investigate the properties of F-concrete also at hightemperatures to answer the question whether concrete members and structures madewith F-concrete indicate the same fire safety level as those made with OPC-concrete. This paper reports the results of investigations of the behaviour of F-concrete at elevated temperatures and parallel investigations of OPC-concretes of comparable mix design comprising thermal stability and strength and deformation behaviour. The thermal stability has been investigated concerning deterioration reactions bythe aid of DIA, alteration of the microstructure by the aid of N2-sorption and mercury porosimetry as well as thermal expansion. The mechanical properties of the concretes at high temperatures have been studied by determining the sigma, epsilon-relationships both with steady state and transient tests (transient strains and restraint forces), the latter simulating more realistically real fire conditions. Using the concept of "normalised transient strain" it is shown that the transient strain depends linearly on the load level up to an ultimate value. All the concretes behaved nearly in the same way up to a temperature of almost 350 °C. Owing to a different mineralogical and structural composition (especially low Ca(OH)2-content), the F-concrete indicates in many respects a more advantageous high temperature behaviour than OPC-concretes. Strong increase in transient strain and loss of strength occur first above 600 °C.

AB - F-cement is a binder for concrete based on finely ground granulated blast furnace slag activated with an alkaline admixture. The base material consists mainly of Ca-silicates of considerably lower CaO/SiO2-ratio than ordinary Portland Cement (OPC) clinker. It has a lower water requirement than pure clinker, it liberates little or no Ca(OH)2 during hydration and the liquidising effect of superplasticizers is much stronger than on OPC clinker. This leads to a different mineralogical and structural composition of the cement paste that significantly influences the thermal behaviour of the concrete. It has been necessary to investigate the properties of F-concrete also at hightemperatures to answer the question whether concrete members and structures madewith F-concrete indicate the same fire safety level as those made with OPC-concrete. This paper reports the results of investigations of the behaviour of F-concrete at elevated temperatures and parallel investigations of OPC-concretes of comparable mix design comprising thermal stability and strength and deformation behaviour. The thermal stability has been investigated concerning deterioration reactions bythe aid of DIA, alteration of the microstructure by the aid of N2-sorption and mercury porosimetry as well as thermal expansion. The mechanical properties of the concretes at high temperatures have been studied by determining the sigma, epsilon-relationships both with steady state and transient tests (transient strains and restraint forces), the latter simulating more realistically real fire conditions. Using the concept of "normalised transient strain" it is shown that the transient strain depends linearly on the load level up to an ultimate value. All the concretes behaved nearly in the same way up to a temperature of almost 350 °C. Owing to a different mineralogical and structural composition (especially low Ca(OH)2-content), the F-concrete indicates in many respects a more advantageous high temperature behaviour than OPC-concretes. Strong increase in transient strain and loss of strength occur first above 600 °C.

KW - cements

KW - cement paste

KW - concrete

KW - slag cements

KW - slag concrete

KW - blast furnace slage

KW - admixtures

KW - portland cements

KW - high temperature

KW - clinker

M3 - Report

SN - 951-38-2649-X

T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports

BT - Material properties of F-concrete at high temperatures

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Jumppanen U-M, Diederichs U, Hinrichsmeyer K. Material properties of F-concrete at high temperatures. Espoo: VTT Technical Research Centre of Finland, 1986. 230 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 452).