Carbonation of concrete has been studied extensively over the last few decades.
However due to time consuming process of carbonation, accelerated carbonation
test comes to use by many researchers to shorten the experimental time.
Considering the complex process of carbonation and number of parameters involve,
there are always some uncertainties in the accelerated carbonation test results. Most
importantly the moisture content and distribution before carbonation test can
significantly affect the carbonation test results. An experiment has been carried out
to study the natural carbonation of concrete in Singapore exposure condition. Four
set of specimens with Portland cement and partial replacement of PC with fly ash,
condensed silica fume and ground granulated blast furnace slag has been prepared.
Generally, the rate of carbonation is faster in indoor condition in comparison to
outdoor exposure. Therefore, the specimens have been kept in indoor condition
without air conditioning to represent common storage area and inside of offices with
air conditioning. The effect of various percentages of mineral admixture replacement,
curing period, w/c ratio and exposure condition has been studied.