Effects of mix composition and water-cement ratio on the sulfate resistance of blended cements

Sahmaran M., Kasap O., Duru K., Yaman I. O.

CEMENT & CONCRETE COMPOSITES, vol.29, no.3, pp.159-167, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 3
  • Publication Date: 2007
  • Doi Number: 10.1016/j.cemconcomp.2006.11.007
  • Journal Name: CEMENT & CONCRETE COMPOSITES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.159-167
  • Keywords: blended cement, sulfate attack, fly ash, natural pozzolan, ATTACK, CONCRETE
  • Middle East Technical University Affiliated: Yes

Abstract

This paper presents an experimental investigation on the sulfate resistance of blended cements containing various amounts of natural pozzolan and/or Class-F fly ash. The performance of blended cements was monitored by exposing the prepared mortar specimens to a 5% Na2SO4 Solution for 78 weeks. For comparison, an ordinary Portland cement (produced with the same clinker as blended cements) and it sulfate resistant Portland cement (produced from a different clinker) were also used. In addition to the cement chemistry, water-cement (w/c) ratio of mortars was another parameter selected that will presumably affect the performance of mortars. The experimental results of expansion measurements showed that the effect of w/c ratio was more pronounced for the low sulfate resistant cements with higher C(3)A amounts, while the blended cements were less affected by an increase in the w/c ratio. (C) 2006 Elsevier Ltd. All rights reserved.