Will the shrinkage and deformation of cement paste cause cracks in cement crafts?

Cement-based materials have significant volume sensitivity. Once the shrinkage stress caused by the volume change exceeds the limit, it will crack. There are two main reasons for volume shrinkage: temperature shrinkage and drying shrinkage. Given that the volume is "hand-held grade", temperature shrinkage is not considered here, only dry shrinkage is considered, that is, the volume shrinkage of the material after the mixing water evaporates.

BC is the water-cement ratio W/C=0.45, the cement adopts ordinary Portland cement R32.5, the volume shrinkage rate within 80h, the volume shrinkage is about 0.8% within 80 hours at this mixing ratio, generally no structural cracks will occur , But micro cracks are unavoidable. Cement-based composite materials, no matter how reasonable the mix ratio, how scientific the construction is, or how careful the maintenance is, it must have micro cracks that cannot be observed by the naked eye, which is determined by the characteristics of its highly heterogeneous system. Micro-cracks are not insignificant. When the micro-cracks continue to develop under the repeated load, the cracks will cause structural damage to the cement crafts when they penetrate the substrate.