Water absorption of concrete is an important indicator of concrete durability, which is closely related to the porosity and pore structure of concrete. This study investigates the water absorption behavior of carbonated concrete specimens containing reactive MgO of 10%, 30%, 50%, 70% and 90%. Meanwhile, the corresponding chemical composition and pore structure of each mix was characterized by XRD, TG/DTA, MIP and SEM. Experimental results reveal that the uniform pore structure of carbonated concrete containing 10%, 50%, 70% and 90% reactive MgO result in either high initial sorptivities or high quantities of absorbed water. The gradually microstructural change of a denser outer layer and less-dense inner layer from the surface to the center of the 50% reactive MgO concrete yields a low initial sorptivity and absorbed water quantity, which may have beneficial improvement on the freeze/thaw resistance and de-icing salt scaling resistance of concrete.

混凝土的吸水率是混凝土耐久性的重要指标，它与混凝土的孔隙率和孔结构密切相关。这项研究调查了含活性MgO为10％，30％，50％，70％和90％的碳酸混凝土标本的吸水行为。同时，通过XRD，TG / DTA，MIP和SEM对每种混合物的相应化学组成和孔结构进行了表征。实验结果表明，含有10％，50％，70％和90％反应性MgO的碳酸混凝土的均匀孔结构会导致高初始吸附性或大量吸收的水。从表面到50％活性MgO混凝土的中心到外层的致密层和致密层的逐渐微观结构变化，会导致较低的初始吸水性和吸收的水量，