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Drying shrinkage, which has long been a subject of study, occurs when concrete is exposed to a low relative humidity (RH). Shrinkage is also an issue in concrete with a low water/cement (w/c) ratio, which is now being widely used. Although a low w/c results in high strength and low permeability, it has been found that autogenous shrinkage becomes non-negligible. Any shrinkage would induce tensile stress, which can cause cracking and undermine the long-term performance of a structure. To evaluate and predict the influence of shrinkage, empirical formulas have been suggested in previous studies. From another standpoint, shrinkage behavior is associated with microscale thermodynamic properties, such as hydration, pore-structure formation, and the behavior of water in micropores. These properties vary according to the raw materials, mix proportion, age, and ambient conditions of the concrete. Without substantially grasping the relationships among the effects of these properties, it is difficult to provide an appropriate evaluation of shrinkage under arbitrary conditions. Therefore, it is important to establish a model that couples shrinkage behavior with microscale properties.

AN ENHANCED MODEL FOR SHRINKAGE BEHAVIOR BASED ON EARLY AGE HYDRATION AND MOISTURE STATE IN PORE STRUCTURE