Recommendations of RILEM TC 178-TMC: 'Testing and modelling chloride penetration in concrete' Analysis of total chloride content in concrete

Title: Recommendations of RILEM TC 178-TMC: 'Testing and modelling chloride penetration in concrete'
Analysis of total chloride content in concrete
Author(s): RILEM TC 178-TMC
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 35
Issue: 253
Issue date: 2002-11-01
Publication year: 2002
Pages: 583 - 585
Total Pages: 3
Nb references: 8
Language: English

Abstract: Reinforcing steel bars embedded in concrete depassivate when a certain amount of chlorides is built up in their surrounding,being the risk for reinforcement corrosion related to the chloride content in the concrete.
Therefore,reliable chloride analysis in hardened concrete becomes a key parameter in the evaluation of existing structures and in the prediction of future service life.
The present recommendation is the result of a Round-Robin Test on chloride analysis in concrete,carried out by the Technical Committee TC 178-TMC.
A total of 30 laboratories around the world have participated in this RRT and 64 different analyses on triplicate specimens for three different chloride contents have been carried out.
The procedure for the analysis of total chloride has been divided in two steps:extraction and quantification ,being able to discriminate the reliability of the procedure followed in each of them.
Two different methods of extraction of total chloride from the solid sample as well as six different forms of analysing the resulting liquids have been tested.
It was also decided that other methods could also be used to the choice of each laboratory.
The complete recipes and results including the statistical analysis can be found in [1 ].
Other round-robin tests can be found in [2,3 ],being presently one the largest ever performed.
As a final result,the method considered to be the most suitable reference for total chlorides (extraction and quantification)is the Volhard method [4-7 ],which is that described in this recommendation.
The ASTM reference method for analysis of total chlorides can be found in [8 ].

Online publication: 2002-09-27
Classification: RILEM Technical Committees
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/13840