低温 / 常温养护下混凝土的本构模型和抗爆试验

The mechanical properties of concrete materials are closely related to the curing environment. Limited by the construction environment, some concrete structures are poured and formed at high altitudes or in cold, low-temperature conditions. In this work, several uniaxial compressive tests are conducted on concrete specimens cured at both low and room temperatures to study their mechanical properties and blast resistance. Based on the results of these tests, the damage evolution function related to the length of curing is introduced, the plastic flow factor is modified and the constitutive model of concrete under low / room temperature curing is established to predict the mechanical properties of concrete. Blast impact tests of concrete are conducted to compare the blast resistance of concrete blocks under low / room temperature curing. The research results show that: the compressive strength of concrete materials under low-temperature curing is about 34. 6% ~ 56. 8% of that under room temperature curing. Compressive strength is positively correlated with the length of curing and negatively correlated with the internal moisture of the specimens. The mechanical properties of concrete under low / room temperature curing can be effectively predicted by the established concrete constitutive model. The blast resistance of concrete formed by low-temperature curing is reduced, but it still exhibits notable blast resistance capabilities.