چكيده به لاتين
Todays concrete is one of the main and most usage material in the structures. Deterioration of concrete structures, especially exposed structures, can happen because of several phenomena such as, carbonation, chloride ion attacks, sulfate attacks, freezing and thawing cycles. Among such deleterious environmental elements, carbonation and chloride ion attacks are more probable, especially in urban and marine environments like large harbors. Carbonation is widely recognised as a significant cause of corrosion of reinforcement in concrete. However, in addition to the depassivation of the steel it has several other effects.
In the present study the effect of water/cement ratio and some other parameters on the carbonation resitant and mechanical behavior of concrete have been investigated experimentally.
Specimens containing different amounts of water/cement ratio (0.4 to 0.6) were cured in an apparatus in which CO2 pressure and volume, temperature, and relative humidity were held constant, and cycles that simulate tide were executed automatically. In order to signify the mechanical properties and durability of concrete due to simultaneous carbonation, compressive strength and depth of carbonation were measured. The results show that the water/cement ratio has a significant effect on depth of carbonation and whit increasing this ratio from 0.4 to 0.6, the carbonation depth increased from 7.02 mm to 14.87 mm in 72hr exposure in Co2 gas.
Keywords: Concrete, PH, Carbonation depth, Compressive strength, water/cement ratio.
