掺工业废渣水泥砂浆的力学性能及护筋特性研究

Mechanical properties and steel-protection property of cement mortar incorporating industrial wastes

研究了大掺量(50%~75%)陶瓷废渣粉及粉煤灰对水泥砂浆力学性能、毛细孔吸水率和护筋性能的影响。结果表明,砂浆28 d抗压、抗折强度和护筋性能均随着废渣粉掺量的增加先提高后降低,而毛细孔吸水系数随着废渣粉掺量的增加先减小而后增大。综合力学性能、耐久性能和环境效应,废渣粉的合理取代率为60%,砂浆的28 d抗压强度为38.38 MPa,抗折强度为6.3 MPa,毛细孔吸水系数为4.6 g/(m^(2)·s^(1/2)),7 d电化学加速腐蚀钢筋的质量损失率为0.21%,保护层强度提高了28.6%。SEM分析表明,掺50%和60%废渣的砂浆微观结构密实,而掺70%废渣的砂浆结构疏松多孔。

The effects of hybrid waste powder(containing 1∶1 ceramic waste powder and fly ash)on the mechanical properties,capillary pore water absorption and steel-protection property of cement mortar were studied.The content of hybrid waste powder was up to 50%~75%.The results show that the 28-day compressive strength,flexural strength and reinforcement properties of the mortar first increase and then decrease with the increase of the hybrid waste powder content,while the capillary water absorption coefficient first decreases and then increases with the increase of the hybrid waste powder content.In comprehensive consideration of mechanical properties,durability and environmental effects,the reasonable mixing amount of hybrid waste powder was 60%,and the flexural and compressive strength of this cement mortar was about 6.3 MPa and 38.38 MPa,respectively.The coefficient of capillary pore water absorption of was about 4.6 g/(m^(2)·s^(1/2)).The mass loss of electrochemically accelerated corrosion steel rebar in 7 days was 0.21%,and the strength of the protective layer increased by 28.6%.SEM test results showed that the microstructure of the mortar mixed with 50%and 60%hybrid waste is dense,while the structure of the mortar with 70%hybrid waste is loose and porous.