၁။
Concrete Deterioration
ကကကကကကက deterioration ကကကကကကကကက ကကကကကကကကကကကက
ကကကကကကကကကကကကကကကကက
၁ . Physical deterioration
၂ . Chemical deterioration
၃ . Reinforcement corrosion deterioration
a). Carbonation
b). Chlorides
a). Carbonation(Overview)
Picture Ref; Internet.
ကကကကကကကကကကကက ကကကကကက Calcium(Eg; Calcium Hydroxides and CalciumSilicate-Hydrate) ကကက ကကကကကကက ကကကကကကကကPores ကကကကကကက
ကကကကကကကကက ကကကကကကကကကကကကက CO2 ကကကက Reacts ကကကကကကကက Calcium
Carbonate (CaCO3) ကကကကကကကကကကကကက…
Ca(OH)2 + CO2
= CaCO3 + H2O
Carbonation Rate
=
K square root of time
Carbonation ဖဖဖဖဖဖဖဖဖဖ ဖဖဖဖဖဖဖဖဖဖ ဖဖဖဖဖဖဖဖဖဖဖဖဖဖ
1.Compressive strength
2.Splitting strength
3.Electrical resistivity ကကကကကကကကက ကကကကကကကကကကကကက…
Carbonation ဖဖဖ ဖဖဖဖဖဖဖဖဖဖဖဖဖဖဖဖဖဖဖဖ ဖဖဖဖဖဖဖဖဖ
၁ . ကကကကကကကကကကကကကကကကကကကကက ကကကကကကကကကကက ကကက
ကကကကကကကကကကကကက
၂ . ကကကကကကကကကကကကကကကက ကကကကကကကကကကကကကက(pores) ကကကကကကကက
ကကကကကကက
၃ . ကကကကကကကကကကကက ကကကကကကကကကကက


ကကကကကကက ကကကကကကကကကကက ကကကကကကကကကကကကကကကကကကကကက
ကကကကကကက…
ကကကကကကက ကကကကကကကကကကက ကကကကကကကကကက ကကကကကကကကကကက
ကကကကကကက…
Control of Carbonation
1. Lower Water/Cement
2. Lower Relative Humanity
Prevention from Carbonation
1. Barrier Coations
2. Keim Mineral Paints