Betong och betongprodukter

Ämnesområden: Betong och betongprodukter
Kommittébeteckning: SIS/TK 190 (Betong)
Källa: CEN
Svarsdatum: den 18 dec 2018
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This procedure is a method for evaluating the carbonation resistance of concrete using test conditions that accelerate the rate of carbonation. After a period of preconditioning, the test is carried out under controlled exposure conditions using an increased level of carbon dioxide.

NOTE The test under reference conditions takes a minimum of 112 days comprising a minimum age of the specimen prior to conditioning of 28 days, a minimum conditioning period of 14 days and an exposure to increased carbon dioxide levels of 70 days.

This procedure is not a method for the determination of carbonation depths in existing concrete structures.

Ämnesområden: Betong och betongprodukter
Kommittébeteckning: SIS/TK 190 (Betong)
Källa: CEN
Svarsdatum: den 15 jan 2019
Se merSe mindre
 

This document describes the procedure for obtaining the non-steady-state chloride migration coefficient of specimens of hardened concrete at a specified age. The test procedure does not take into account any interaction of concrete with the saline solution over time. The test result is a durability indicator with respect to the resistance of the concrete investigated against chloride penetration.

The test procedure does not apply to concrete specimens with surface treatments such as silanes.

If the aggregate is electrically conductive or porous this will influence the magnitude of chloride migration. This fact is taken into account when establishing threshold values. It prevents comparison of chloride migration values between concretes if the aggregates show a difference of half an order of magnitude (higher or lower) of chloride migration.

Similar influence may be seen when metallic or electrically conducting fibres or particles are present.