The effect of sulphate on length change of concrete

Oymael S.

Oil Shale, vol.24, no.4, pp.561-571, 2007 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 4
  • Publication Date: 2007
  • Journal Name: Oil Shale
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.561-571
  • Hatay Mustafa Kemal University Affiliated: Yes

Abstract

Sulphates usually affect calcium aluminates in cements. Sulphate ions might have negative effects on cement hydration and it would be a reason of decrease in cement strength. In this study, the effects of Na2SO4 solution on the concretes made from OPC with oil shale ash (OSA) addition (0, 15 and 30%) were investigated. Concretes with 15% OSA gave the lowest value of Length Change Factor (LCF). Addition of an optimum amount of super-plasticizer increases positive properties of the concrete with 15% OSA addition, binds free Ca(OH)2 in OPC, makes its composition more effective, prevents massive alkali-aggregates reactions showing that this addition rate is proper. © 2007 Estonian Academy Publishers.