Effects of curing conditions on properties of concrete using slag replacement

Corina Maria Aldea, Francis Young, Kejin Wang, Surendra P. Shah

Research output: Contribution to journalArticlepeer-review

173 Scopus citations

Abstract

The effects of curing conditions on properties of slag cement concrete were studied. Autoclaving (175°C, 0.5 MPa) and steam curing (80°C) were compared to normal curing (28 days, 20°C, and 100% RH). Four different concrete mix designs with the same mix proportions and different cement replacements were used: 0% slag (control), 25% slag, 50% slag, and 75% slag. The effects of slag replacement and curing conditions upon concrete properties were examined. The properties examined included mechanical properties (compressive and tensile strength), transport properties (chloride permeability and chloride penetration), and microstructural properties (pore structure and phase composition). There is little effect of slag replacement up to 50% upon strength, whereas higher replacement results in a drop in compressive strength. Steam curing reduces the compressive strength compared to the other curing types considered in this study. Chloride permeability and penetrability significantly decrease with increasing slag replacement except for autoclave curing, which is the least sensitive with respect to slag replacement compared to the other curing types considered in this study. The addition of slag reduces the continuous pore diameter, which correlates well with the initial current (IC) measured by the rapid chloride permeability test (RCPT).

Original languageEnglish (US)
Pages (from-to)465-472
Number of pages8
JournalCement and Concrete Research
Volume30
Issue number3
DOIs
StatePublished - Mar 2000

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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