Effect of chloride penetration on the properties of hardened cement pastes

  • Midgley H
  • Illston J
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Abstract

The effects of chloride ions penetrating hardened cement pastes (hcp) have been investigated by DTG, QXRD, chemical analysis and mercury intrusion porosimetry. It has. been found that the higher the w/c ratio-the greater the penetration of chloride ions; the concentration with depth of penetration follows a power relationship. Chloride reacts with the calcium aluminates in the cement to foim the complex chloroaluminate C3A CaCl2 12H2O. Not all the chloride present is bound up in the mineral some is left as free chloride. 5The quantity of bound chloride found does not depend on the amount of C3A in the unhydrated cement since calcium aluminate hydrates occur in the hcp with the chloroaluminate. Chloride penetration altere the pores in the hop, the greater the chloride concentration the smaller the pores formed at the expense of the slightly larger ones.

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Authors

  • H G Midgley

  • J M Illston

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