摘要
为探究碳纳米管/锂渣混凝土的基本性能,设置水胶比为0.35、0.40和0.45,碳纳米管(CNTs)掺量为0、0.05%、0.10%和0.15%,锂渣(LS)掺量为20%的混凝土配合比,以抗压强度、电通量等作为表征参数,分析不同CNTs掺量、不同水胶比对混凝土抗压强度及抗氯离子渗透性能的影响,结合工业CT(ICT)扫描技术从细观层面分析碳纳米管/锂渣混凝土的孔隙结构及其特征参数。研究结果表明:CNTs掺量为0.10%时达到抗压强度最大值;水胶比由0.45降低到0.35,抗压强度最大提升34.04%;通过电通量测试分别测得28 d、56 d的数据得出碳纳米管/锂渣混凝土电通量等级分布在低与很低两个水平内,抗压强度与抗氯离子渗透性能之间存在明显的正相关性,通过分析证明,可以考虑初始电流作为氯离子渗透性能的评价指标。此外,通过CT扫描进一步研究碳纳米管/锂渣混凝土的孔隙结构,利用Image Proplus与VGStudio等软件对孔隙结构相关特征参数的提取、统计与分析,分析结果表明,适量的CNTs与较低的水胶比有利于孔结构的优化,且细观结构与宏观性能之间有着较强的相关性。
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.
作者
秦拥军
张逸飞
赵鹏
王涛
QIN Yongjun;ZHANG Yifei;ZHAO Peng;WANG Tao(School of Architecture and Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Civil Engineering Technology Research Center,Urumqi 830047,China;Xinjiang Yanke Energy Saving Technology Co.,Ltd.,Urumqi 841100,China)
出处
《混凝土》
CAS
北大核心
2024年第7期4-10,共7页
Concrete
基金
国家自然科学基金(51668061)。
关键词
混凝土
碳纳米管
锂渣
电通量
CT
细观结构
concrete
carbon nanotubes
lithium slag
electric flux
CT
mesostructure
