Adhikary Suman Kumar, Rudžionis Žymantas, Tučkutė Simona, Ashish Deepankar Kumar
Faculty of Civil Engineering and Architecture, Kaunas University of Technology, 44249, Kaunas, Lithuania.
Center for Hydrogen Energy Technologies, Lithuanian Energy Institute, Breslaujos st. 3, 44403, Kaunas, Lithuania.
Sci Rep. 2021 Jan 22;11(1):2104. doi: 10.1038/s41598-021-81665-y.
This study is aimed to investigate the effect of carbon nanotubes on the properties of lightweight aggregate concrete containing expanded glass and silica aerogel. Combinations of expanded glass (55%) and hydrophobic silica aerogel particles (45%) were used as lightweight aggregates. Carbon nanotubes were sonicated in the water with polycarboxylate superplasticizer by ultrasonication energy for 3 min. Study results show that incorporating multi-wall carbon nanotubes significantly influences the compressive strength and microstructural performance of aerogel based lightweight concrete. The addition of carbon nanotubes gained almost 41% improvement in compressive strength. SEM image of lightweight concrete shows a homogeneous dispersal of carbon nanotubes within the concrete structure. SEM image of the composite shows presence of C-S-H gel surrounding the carbon nanotubes, which confirms the cites of nanotubes for the higher growth of C-S-H gel. Besides, agglomeration of carbon nanotubes and the presence of ettringites was observed in the transition zone between the silica aerogel and cementitious materials. Additionally, flowability, water absorption, microscopy, X-ray powder diffraction, and semi-adiabatic calorimetry results were analyzed in this study.
本研究旨在探究碳纳米管对含有膨胀玻璃和二氧化硅气凝胶的轻集料混凝土性能的影响。采用膨胀玻璃（55%）和疏水性二氧化硅气凝胶颗粒（45%）的组合作为轻集料。通过超声能量将碳纳米管与聚羧酸系高效减水剂在水中超声处理3分钟。研究结果表明，掺入多壁碳纳米管会显著影响气凝胶基轻质混凝土的抗压强度和微观结构性能。碳纳米管的添加使抗压强度提高了近41%。轻质混凝土的扫描电子显微镜图像显示碳纳米管在混凝土结构中均匀分散。复合材料的扫描电子显微镜图像显示碳纳米管周围存在C-S-H凝胶，这证实了碳纳米管是C-S-H凝胶更高生长的位点。此外，在二氧化硅气凝胶与胶凝材料之间的过渡区观察到了碳纳米管的团聚和钙矾石的存在。此外，本研究还分析了流动性、吸水性、显微镜观察、X射线粉末衍射和半绝热热量测定结果。
