Dispersion of multi-walled carbon nanotubes and its effects on the properties of cement composites

2016 ◽  
Vol 74 ◽  
pp. 154-163 ◽  
Author(s):  
Forood Torabian Isfahani ◽  
Weiwen Li ◽  
Elena Redaelli
Keyword(s):  
Carbon Nanotubes ◽  
Cement Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Effects of CNT Doping Level and Water/Cement Ratio on the Piezoresistivity of CNTS/Cement Composites

2010 ◽  
Author(s):  
Baoguo Han ◽  
Xun Yu ◽  
Jinping Ou
Keyword(s):  
Carbon Nanotubes ◽  
Compressive Stress ◽  
Electrical Resistance ◽  
Doping Level ◽  
Experimental Results ◽  
Cement Composites ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The carbon nanotubes (CNTs)/cement composites with different doping levels of multi-walled carbon nanotubes (MWNTs) and water/cement ratios are fabricated. By comparing the responses of electrical resistance of these CNTs/cement composites to compressive stress, the effects of MWNT doping level and water/cement ratio on the piezoresistive sensitivity of composites are investigated. Experimental results indicate that the piezoresistive sensitivities of CNTs/cement composites with 0.05 wt. %, 0.1 wt. % and 1 wt. % of MWNTs firstly increase and then decrease with the increase of CNT doping levels. The electrical resistance of CNTs/cement composites 0.6 water/cement ratio is more sensitive to compressive stress than that of composites with 0.45 water/cement ratio.

Effects of post-fire curing on the mechanical properties of cement composites containing carbon black nanoparticles and multi-walled carbon nanotubes

2021 ◽  
Vol 310 ◽  
pp. 125118
Author(s):  
Gustavo Henrique Nalon ◽  
José Carlos Lopes Ribeiro ◽  
Eduardo Nery Duarte de Araújo ◽  
Leonardo Gonçalves Pedroti ◽  
José Maria Franco de Carvalho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Black ◽  
Cement Composites ◽  
Carbon Black Nanoparticles ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Methylcellulose stabilized multi-walled carbon nanotubes dispersion for sustainable cement composites

2017 ◽  
Vol 146 ◽  
pp. 76-85 ◽  
Author(s):  
Ming Rui Du ◽  
Hong Wen Jing ◽  
Wen Hui Duan ◽  
Guan Sheng Han ◽  
Shu Jian Chen
Keyword(s):  
Carbon Nanotubes ◽  
Cement Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Compressive Strength and Microstructure of Multi-Wall Carbon Nanotubes Reinforced Cement Composites

2012 ◽  
Vol 450-451 ◽  
pp. 594-599
Author(s):  
Jin Tao Liu ◽  
Dong Ming Yan ◽  
Shi Lang Xu
Keyword(s):  
Carbon Nanotubes ◽  
Compressive Strength ◽  
Carbon Nanotube ◽  
Microscopic Analysis ◽  
Cement Composites ◽  
Cement Pastes ◽  
Multi Wall Carbon Nanotubes ◽  
Multi Walled Carbon Nanotubes ◽  
Reinforced Cement ◽  
Walled Carbon Nanotubes

Advancement in the study of carbon nanotube has enabled its application in civil engineering as constitutive materials or additives. In this study, the availability of applying multi-walled carbon nanotube to improve the characteristics of cement composites was investigated with experiments on more than 30 specimens. The multi-walled carbon nanotubes (MWCNTs) were effectively dispersed in the water with surfactant, which can keep stable for over 3 months. Specimens with MWCNTs of 0.025%, 0.05% and 0.1% of cement (by weight) were tested with a loading machine and then analyzed with a SEM. It was found that the compressive strength of the samples increased with the increasing MWCNTs, it can improve the 7-day compressive strength by 22% . Microscopic analysis (SEM) revealed that carbon nanotubes were surrounded with hydration products. The bridging and debonding of carbon nanotubes in cement pastes was observed as well.

scholarly journals Dispersion of Multi-Walled Carbon Nanotubes Stabilized by Humic Acid in Sustainable Cement Composites

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 858 ◽  
Author(s):  
Yuan Gao ◽  
Hongwen Jing ◽  
Mingrui Du ◽  
Weiqiang Chen
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Humic Acid ◽  
Cement Composites ◽  
Strength Performance ◽  
Alkaline Environment ◽  
Dispersion Degree ◽  
Multi Walled Carbon Nanotubes ◽  
The Stability ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWCNTs) are promising nanoreinforcing materials for cement-based composites due to their superior material properties. Dispersion of MWCNTs is key for achieving the most effective way of enhancing efficiency, which is challenging in an alkaline cementitious environment. In this study, humic acid (HA) was used to stabilize the degree of dispersion of MWCNTs in an alkaline environment. The efficiency of HA in stabilizing MWCNT dispersion in cement composites was characterized using an ultraviolet spectrophotometer. The influences of HA on the workability and mechanical properties of ordinary Portland cement (OPC) reinforced with MWCNTs were evaluated, and the results revealed that the addition of HA can improve the stability of MWCNT dispersion in an alkaline environment. A concentration of 0.12 wt.% HA/S added to MWCNT suspensions was found to perform the best for improving the dispersion of MWCNTs. The addition of HA results in a decreased workability of the OPC pastes but has little influence on the strength performance. HA can affect the mechanical properties of OPC reinforced with MWCNTs by influencing the dispersion degree of the MWCNTs. An optimum range of HA (0.05–0.10 wt.%) is required to achieve the optimum reinforcing efficiency of MWCNTs.

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