Title: Time Evolution of Chloride Penetration in Blended Cement Concrete

Author(s): Yury A. Villagran-Zaccardi, Valeria L. Taus, and Angel A. Di Maio

Publication: Materials Journal

Volume: 107

Issue: 6

Appears on pages(s): 594-602

Keywords: chloride ingress; limestone filler; slag; surface chloride content; time

DOI: 10.14359/51664046

Date: 11/1/2010

Abstract:
Blended cement concrete is currently a necessity to reduce the environmental impact of the construction industry. The lower clinker content may affect some durable characteristics of concrete, such as the resistance to chloride ingress. On the other hand, mineral admixtures may present pozzolanic activity that improves concrete performance over time. This paper presents the results of chloride ingress in concrete specimens made with slag and limestone filler blended portland cement (BPC) when located in the marine environment. Parameters including two water-cement ratios (w/c), three curing treatments, and two maximum aggregate sizes were analyzed. Water-soluble and total chloride ingress profiles were determined during an exposure period of 3 years. The results allowed the time evolution of both the surface chloride content and diffusivity of BPC concrete to be assessed by natural mechanisms.