再生粗骨料碳化处理对混凝土力学性能影响研究

Effect of Carbon-condition of Recycled Coarse Aggregate on Mechanical Properties of Concrete

文中通过调节碳化持续时间(0,30,60 min)和碳化压力(0,0.75,1.5 bar)对再生粗骨料强化处理,研究再生骨料替代率、碳化持续时间和碳化压力对混凝土力学性能影响;并通过压汞法分析混凝土孔隙结构。结果表明,碳化处理再生骨料可改善混凝土力学性能,再生骨料替代率为50%时,碳化压力为主导因素,再生骨料替代率为100%时,碳化持续时间为主导因素;碳化处理可降低混凝土孔隙率、优化孔隙结构。

By controlling the duration of chamber duration with 0 min, 30 min, and 60 min, and the chamber pressure with 0 bar, 0.75 bar, and 1.5 bar, the recycled coarse aggregate was strengthened to investigate the replacement rate, chamber duration and chamber pressure on the mechanical properties of concrete;and the analysis of the pore structure of concrete was performed by the mercury injection method. Results show that the carbon-condition of recycled aggregate can improve the mechanical properties of concrete. When the replacement rate of recycled aggregate is 50%, the chamber pressure is the dominant factor, and when the replacement rate of recycled aggregate is 100%, the chamber duration is the dominant factor. In addition, the carbon-condition can reduce the porosity of the concrete and optimize the pore structure.