CO_2养护对再生混凝土力学性能的影响

Effect of CO_2 curing process on the mechanical property of recycled aggregate concrete

为了进一步改善再生骨料混凝土的性能,研究了CO_2养护对再生混凝土力学性能的影响,并对比了CO_2养护和标准养护条件下普通混凝土、再生混凝土和改性再生混凝土的力学性能和界面区微观形貌。结果表明:标准养护条件下,再生混凝土和改性再生混凝土各龄期的力学性能都低于普通混凝土;CO_2养护条件下,再生混凝土和改性再生混凝土力学性能较标准养护条件下有一定程度的提高,且随着CO_2养护时间的延长,再生混凝土力学性能逐渐增大;CO_2养护时间为48 h时,改性再生混凝土力学性能已经接近甚至超过标准养护条件下的普通混凝土。

In order to improve the properties of recycled aggregate concrete,the effect of CO2 curing process on the mechanical properties of recycled aggregate concrete were studied.The mechanical properties and the microstructure of interfacial zone of recycled aggregate concrete and modified recycled concrete cured by CO2 gas and standard conditions were compared with common concrete.The results show that the mechanical properties of recycled concrete and modified recycled concrete were lower than that of common concrete under standard curing conditions.Under CO2 curing conditions,the mechanical properties of recycled concrete and modified recycled concrete were higher than that under standard curing conditions.And the mechanical properties of recycled concrete increased as the CO2 curing time longer.When the modified recycled concrete cured by CO2 gas 48hours, its mechanical property was closed to even exceeded that of common concrete under standard curing conditions.