Durability of Concrete §4.5 Durability of Concrete Definition Importance of Durability Anti-permeability Freezing Resistance Carbonation /Neutralization Alkali-aggregate Reaction Steps to Improve Durability
Carbonation /Neutralization Fig Sketch Map of Carbonation Carbonation refers to CH in concrete reacted with CO 2 in air. It causes the neutralization of concrete, and decreases the protection of concrete to steel bar.
Fig Instrument in Carbonation Test
Types of cement (quicker carbonation with mineral admixture) W/C Time of carbonation Humidity Concentration of CO 2 Admixture Major Factors Influencing Carbonation
Reducing concrete’s alkalinity Lessening the protection to reinforcement Improving concrete shrinkage Leading to minor crack Influence on concrete performance
Improving compressive strength (taking resilience method into consideration) Filling the pore with CaCO 3, producing water after carbonation, favoring cement hydrate Influence on concrete performance
In short, the disadvantage of carbonation overweighs the advantage, so the speed of carbonation should be slowed down.In short, the disadvantage of carbonation overweighs the advantage, so the speed of carbonation should be slowed down.