Chloride profiling in concrete harbour structures – A study of extensive variations

Title: Chloride profiling in concrete harbour structures – A study of extensive variations
Author(s): H. Wall, L-O. Nilsson
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 7
Language: English

Abstract: The aim of this work is to try to explain why chloride profiles differ significantly even though the samples are taken in a homogeneous concrete, and within a small area. As a first step in this study, different sampling methods have been used to investigate the influence of the sampling method on the achieved results.
Slabs were submerged in a 13.5 % NaCl solution for about six months. Two different sampling methods for collecting concrete specimens for chloride profiling were used, collecting dust by dry drilling and by water-cooled drilling of cores and profile grinding. The sampling of concrete dust was performed with a handheld drilling machine with bore diameters of 8, 12 and 20 mm. The sampling of dust was performed with the slab in both horizontal and vertical position with the purpose of detecting influence on results due to sampling position.
The results from this study show that the chloride profiles from the analyzed cores show little scatter, but also that sampling with a 20 mm bore gives quite accurate results compared to the cores and sampling with smaller bores.

Online publication: 2006-08-02
Classification: 3.3 Theme 3: Monitoring, Repair and Maintenance of Concrete Structures
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.112