Long-Term Chloride Penetration Resistance of Silica Fume Concretes Based on Field Exposure

Title: Long-Term Chloride Penetration Resistance of Silica Fume Concretes Based on Field Exposure
Author(s): R.D. Hooton, E. Bentz, T. Kojundic
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 503 - 512
Total Pages: 10
Nb references: 7
Language: English

Abstract: With support from the Silica Fume Association in the United States, cores were obtained in 2001 and 2002 from four concretes from bridge decks in New York State and one in Ohio. In addition, cores were taken from 4 parking garage decks located in Wisconsin, Utah, and 2 in Ohio. All concrete structures were between 6 and 15 years old when cored and which had been exposed to de-icing salts.
The cores were tested for chloride penetration profiles using mm profiling, chloride bulk diffusion by ASTM C 1556 (similar to Nordtest NT Build 443), rapid chloride penetration (ASTM C 1202), and the depth of cover was noted, where visible.
The results show that all of the silica fume concrete decks had high resistance to chloride penetration, with all full depth bridge decks having between 290 and 690 coulombs on average, while the portland cement concrete had 3900 coulombs. For parking decks, coulomb values ranged from 620 to 980. Predicted time-to-corrosion service life, using the Life-365 program, gave residual life estimates of between 30 and 61 years for the silica fume concretes. In one case, portland cement concrete in an approach slab to a bridge deck was used as a control and was found to be likely subject to corrosion at the time of coring. Predicted residual service lives based on extrapolation from existing chloride penetration profiles gave longer estimates by 10-years on average for the 3 new bridges and for allof the parking garage decks made with silica fume concrete.

Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00