CARBONATION TEST: Global Lab offers the precise, accurate & reliable Carbonation test Accredited by NABL complying the requirement of EN 14630: 2006.


The phenolphthalein test method is intended to measure the depth of the carbonated layer near the surface of hardened concrete. It is not suitable for concrete made with calcium aluminate cement. It may be used on site or in the laboratory, on test specimens or on cores or fragments removed from hardened concrete structures.

What is Carbonation?

Carbonation occurs in Concrete because the calcium bearing phases present are attacked by carbon dioxide of the air and converted to calcium carbonate. Cement paste contains 25-50 % calcium hydroxide Ca(OH)2, which mean that the pH of the fresh cement paste is at least 12.5.