The creep performance has a great influence on the bearing capacity of concrete structures,and the initial loading age(curing age)has a great influence on the creep.Based on the ceramsite concrete beams with four different initial loading ages,a 200 d creep test was conducted to study the effect of initial loading ages on the creep performance of ceramsite concrete beams.The creep calculation formula of ceramsite concrete structure was established based on ACI-209 creep calculation model and ACI-435 long-term deflection calculation method.The results show that with the increase of the initial loading age,the initial deflection,creep deflection velocity and final deflection of ceramsite concrete beams show a decreasing trend,and the decreasing range also decreases with the extension of the loading age.The calculated value of the creep value calculation formula is close to the experimental observation value,and the established calculation formula has good accuracy and applicability.Considering the construction period and economic indicators,it is suggested that 90d should be taken as the loading age of precast ceramsite concrete beams.The conclusions can provide reference for the creep calculation of ceramsite concrete structure.
关键词
陶粒混凝土梁/徐变/初始加载龄期/试验/计算模型
Key words
ceramsite concrete beam/creep/initial loading age/experiment/calculation model
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