Title: Chloride Ingress in Concrete Containing GGBF Slag or Fly Ash

Author(s): Eisuke Nakamura, and Hirohisa Koga

Publication: Symposium Paper

Volume: 320

Issue:

Appears on pages(s): 16.1-16.10

Keywords: carbonation, chloride ingress, combined effect, exposure test, fly ash, ground granulated blast-furnace (GGBF) slag, supplementary cementitious materials (SCMs)

DOI: 10.14359/51701054

Date: 8/1/2017

Abstract:
This paper presents the investigation results of the chloride ingress in concrete containing ground granulated blast-furnace (GGBF) slag or fly ash under chloride exposure. Specimens made from seven different types of concrete mixtures were placed in a test site near the coastline of Okinawa, Japan for 40 months. The replacement ratios of GGBF slag and fly ash were in the ranges of 50–85% and 20–40%, respectively. As a result of the investigation, the carbonation depths of the specimens were observed to increase with the increase in the replacement ratios of GGBF slag or fly ash. The large carbonation depths resulted in inverse chloride profiles: the chloride contents were low in the carbonated zone near the surface of the specimens but high beyond this zone. These inverse chloride profiles were assumed to be induced because of the reduced chloride binding capacity and coarse pore structure in the carbonated zones. Keywords: