This standard specifies an accelerated laboratory method to measure resistance to carbonation, and then to carbon dioxide penetration through products and repair systems, as defined in ENV 1504-3. The method is based on measurement of the sample carbonation depth in an atmosphere of concentrated carbon dioxide, for a time interval determined. This method is used for assessing the performance of for repair grouts, mortars and concretes, without application of a protective coating system.

Once prepared and air-conditioned, the samples must be placed on the knife supports, inside a cabin sealed, equipped with input and output gas connection such as to enable the achievement of a uniform flow of CO2 in all parts of the cabin. After 56 days of parking in the cab, the carbonation depth must be measured using the method of phenolphthalein.

The prism is broken into two, phenolphthalein indicator solution is sprayed, it waits 60 ± 5 min, and making measurements on each face of the sample, as spraying should produce a pink coloring in the non-carbonated concrete.

For each surface, the length of the carbonation front must be divided into four equal parts, so as to obtain five measurement points. With the help of a straight edge or a caliper five measurements are performed, perpendicular to the surface, for all four sides of the sample and then it is possible to calculate the mean for each side. The mean of these four calculated values ​​is carbonation depth dk for the sample.

The measurements then be repeated on the second sample, and the latter should not differ by more than 20%. If the difference is greater ≥ 20% both values ​​should be reported; if the difference is ≤ 20%, you can return the mean value.

 

Material type Standard Test method
skim coats EN 998-1
  •  
restoring EN 1504-3 EN 13295

 

Instrument used to perform the test: phenolphthalein solution

 

The test consists to measure resistance to carbonation, and then to carbon dioxide penetration through products and repair systems. The test consists to measure resistance to carbonation, and then to carbon dioxide penetration through products and repair systems.

The test consists to measure resistance to carbonation, and then to carbon dioxide penetration through products and repair systems. The test consists to measure resistance to carbonation, and then to carbon dioxide penetration through products and repair systems.