The durability is a parameter of great importance to be taken into account in reinforced concrete, this is affected by environmental agents such as CO2, so the present work evaluates the carbonation behavior in hydraulic concrete specimens made with cement Low carbon content (LC3) with respect to Portland cement, located at three exposure sites (Punta Matamoros and University SEDE) with different environmental conditions, by performing the phenolphthalein test according to NC-355: 2004. To understand this phenomenon, other parameters are taken into account such as: the type and content of cement, the pore structure of the material and the curing time.

In this way, it can be concluded that concrete made with LC3 and P-35 cement with a characteristic strength of 25Mpa, the former have a better behavior in tidal areas, reaching maximum values of 2.9 mm; This is because those produced with Portland cement have a greater amount of soluble compounds that leach with sea water and affect the pore structure of the same, removing compounds that provide alkalinity to the material.

On the other hand, when evaluating the carbonation in places where the relative humidity varies between 50 and 70%, the structural elements produced with the ternary cement present a more unfavorable behavior, due to the percentage of substitution of clinker with the consequent reduction of the alkalinity, Reaching maximum values of 11 mm.