碳纳米管水泥基复合材料物理力学性能试验研究

Experimental Investigation on Physical and Mechanical Properties of Carbon Nanotubes Reinforced Cement-based Composites

目前,关于碳纳米管水泥基复合材料物理性能和力学性能的研究还不系统。采用多壁碳纳米管(multi-walled carbon nanotubes,MWCNTs)水性浆料作为增强相,通过试验研究了该材料对水泥标准稠度用水量、凝结时间及安定性的影响;同时对比研究了直接添加和超声处理两种方式制备的复合材料试件的力学性能。结果表明:MWCNTs水性浆料的加入可使水泥的标准稠度用水量呈近似线性增加,初凝时间和终凝时间均延长。MWCNTs能够有效地提高复合材料的力学性能,经超声处理制得的试件28 d抗折强度和抗压强度分别提高了25. 5%和10. 3%,直接添加的分别提高了19. 8%和7. 2%,表明超声处理的MWCNTs可更充分地发挥其增强作用。

At present,the research on the physical properties and mechanical properties of carbon nanotubes reinforced composites is not systematic.The aqueous slurry of multi-walled carbon nanotubes(MWCNTs)was used as the reinforcing phase.The effect of the material on the water consumption,setting time and stability of the standard consistency of cement was studied through experiments.At the same time,the mechanical properties of the specimens prepared by direct addition and ultrasonic treatment were compared.The results show that the water requirement of normal consistency increases approximately linearly with the addition of the carbon nanotubes slurry.Both the initial setting time and the final setting time are prolonged.The carbon nanotubes can effectively improve the mechanical properties of the composites.The flexural strength and compressive strength of the specimens obtained by ultrasonic treatment increase by 25.5%and 10.3%,respectively,and the direct additions increase by 19.8%and 7.2%,respectively.It indicates that the sonicated carbon nanotubes can exert their reinforcing effect more fully.