Study on Mesoscopic Mechanical Mechanism of Shrinkage Cracking of Early Age Concrete
Mitigating shrinkage cracking of early age concrete is of vital importance to the durability and waterproof performance of concrete structures.The mechanism of shrinkage cracking of early concrete was studied based on meso-mechanics.The numerical concrete specimen with random coarse aggregates,mortar and interfacial transition zone(ITZ)was generated.With the help of experimental data,the mechanical parameters required for simulation were determined and verified.The results show that the random distribution of coarse aggregate has slight influence on the shrinkage strain in the early age of concrete,and the maximum relative error of the shrinkage strain value of concrete at 24 h under differ-ent distribution forms is 7% ;The shrinkage crack of the slab concrete specimen in the early stage developed along the ITZ unit in the tip area of the crack inducer,and the maximum relative error of the crack area with different coarse aggre-gate distribution was 9.5% .
万方数据
维普
