Concrete Carbonation Chamber


-Capacity : 440L
-Temp Range : 15-30 deg C

-Temp Accuracy : ±1

-Humidity range: 50 to 90% RH

-CO² Concentration : 0 -20 % ±3%
-Dimension Inner : 660 x 550 x 1230 mm

-Dimension Outer:1160 x 760 x 1560 mm

-Power Supply : 240V 1P 50Hz,1250W

-Weight :160kg

Carbonation is a process in which carbon dioxide from the atmosphere diffuses through the porous

Cover concrete and may reduce the pH to 8 or 9, at which the passivating /oxide film is no longer

stable. Carbonation process involves the following two stages: First, the atmospheric carbon

dioxide (CO2) reacts with water in the concrete pores to form carbonic acid (H2CO3).

This is followed by reaction of the carbonic acid with calcium hydroxide [Ca(OH)2] to form calcium

Carbonate (CaCO3). This process leads to cause a reduction in the pH value of the pore solution

from 12.5 to 13.5 to around 8 to 9, which causes depassivation of protective layer of the reinforcement bars and initiates their corrosion.


Carbonation of concrete is one of the main reasons for corrosion of reinforcement. Oxygen and

moisture are the other components required for corrosion of embedded steel. In this test, the

depth of carbonation is determined. The rate of carbonation depends on the grade of concrete,

permeability of concrete, whether the concrete is protected or not, depth of cover, time, etc.


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