Experimental study on compressive strength and chloride ion penetration resistance of carbon nanotube/lithium slag concrete
In order to explore the basic performance of carbon nanotube/lithium slag concrete,the mix proportion of concrete with water binder ratio of 0.35,0.40 and 0.45,carbon nanotube(CNTs)content of 0,0.05%,0.10%and 0.15%,lithium slag(LS)content of 20%is set,and the impact of different CNTs content and water binder ratio on the compressive strength and chloride ion penetration resistance of concrete is analyzed with the compressive strength,electric flux and other characterization parameters.Combined with industrial CT(ICT)scanning technology,the pore structure and characteristic parameters of carbon nanotube/lithium slag concrete were analyzed from the micro level.The results show that the compressive strength reaches the maximum when the CNTs content is about 0.10%.The water binder ratio decreased from 0.45 to 0.35,and the maximum compressive strength increased by 34.04%.According to the data of 28 days and 56 days measured by the electric flux test,the electric flux grade of carbon nanotube/lithium slag concrete is distributed in the low and very low levels,and there is an obvious positive correlation between the compressive strength and the resistance to chloride ion penetration.Through analysis,it is proved that the initial electric current can be considered as the evaluation index of chloride ion penetration performance.In addition,the pore structure of carbon nanotube/lithium slag concrete was further studied by CT scanning,and the relevant characteristic parameters of pore structure were extracted,counted and analyzed by using Image Proplus,VGStudio and other software.The analysis results showed that an appropriate amount of CNTs and a low water binder ratio were conducive to the optimization of pore structure,and there was a strong correlation between meso structure and macro performance.
万方数据
