scholarly journals DYNAMIC RHEOLOGICAL PROPERTIES OF POLYSTYRENE/MULTI-WALLED CARBON NANOTUBES COMPOSITES

2011 ◽  
Vol 011 (2) ◽  
pp. 224-229 ◽  
Author(s):  
Aizhi GUAN ◽  
Yihu SONG ◽  
Yeqiang TAN ◽  
Qiang ZHENG
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Dynamic Rheological Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Study of Rheological Properties of Carbon Nanotube-Reinforced Ultrafine Cement Grouting Materials

2021 ◽  
pp. 1-44
Author(s):  
Yunxiao Liu ◽  
Jiahang Zhang ◽  
Yinyin Chi
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Polyvinyl Pyrrolidone ◽  
Cement Grouting ◽  
Grouting Material ◽  
Multi Walled Carbon Nanotubes ◽  
Different Diameters ◽  
Grouting Materials ◽  
Walled Carbon Nanotubes ◽  
Ultrafine Cement

In this study, three different diameters of multi-walled carbon nanotubes (MWCNTs) dispersed by polyvinyl pyrrolidone (PVP) were used to reinforce superfine cement grouting materials. The effect of MWCNTs and polyvinyl pyrrolidone (PVP) on the rheological properties of grouting material were accordingly studied. It was found that the yield stress (τ0) and plastic viscosity (η) were slightly decreased when PVP content was low and increased when the PVP content increased. The effect of MWCNT diameter on τ0 was not found to be clear but was more significant on η. The smaller MWCNT diameter was, the more quickly η increase. It was also found that the thixotropic ring area was increased as the MWCNTs content increased. The addition of PVP and MWCNTs caused an increase in the number of entanglement points in different scales, which was the main reason for the viscosity and thixotropy increase. Therefore, the rheological properties of superfine cement grouting material should be adjusted when MWCNTs were added as a reinforcing component. Due to the wrapping of PVP on cement particles which isolates the contacting part between the water and the cement particles, it slows down the cement's hydration rate thus slows down the fluidity loss of the slurry.

β-nucleated propylene–ethylene random copolymer filled with multi-walled carbon nanotubes: Mechanical, thermal and rheological properties

Polymer ◽  
2014 ◽  
Vol 55 (16) ◽  
pp. 3758-3769 ◽  
Author(s):  
Dimitrios G. Papageorgiou ◽  
Lazaros Tzounis ◽  
George Z. Papageorgiou ◽  
Dimitrios N. Bikiaris ◽  
Konstantinos Chrissafis
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Random Copolymer ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The effect of multi-walled carbon nanotubes on the rheological properties and hydration process of cement pastes

2018 ◽  
Vol 189 ◽  
pp. 947-954 ◽  
Author(s):  
Dainius Leonavičius ◽  
Ina Pundienė ◽  
Giedrius Girskas ◽  
Jolanta Pranckevičienė ◽  
Modestas Kligys ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Hydration Process ◽  
Cement Pastes ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Rheological Properties and Flow Behaviour of Cement-Based Materials Modified by Carbon Nanotubes and Plasticising Admixtures

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 169
Author(s):  
Gintautas Skripkiunas ◽  
Ekaterina Karpova ◽  
Joana Bendoraitiene ◽  
Irmantas Barauskas
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Yield Stress ◽  
Cement Paste ◽  
Shear Thickening ◽  
Plastic Viscosity ◽  
Flow Behaviour ◽  
Volume Coefficient ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this study, the rheological properties of cement paste modified by a suspension containing both multi-walled carbon nanotubes (MWCNT) and carboxymethyl cellulose (CMC) (MWCNT/CMC suspension) with different types of plasticising admixtures (Pl), such as lignosulphonate (LS), sulfonated naphthalene formaldehyde condensate (NF), and polycarboxylate ether (PCE) were evaluated. The increase in yield stress and plastic viscosity up to 20% was established in the case of the modification of cement-based mixtures by MWCNT in the dosage up to 0.24% by weight of cement (bwoc) without Pl and with LS and NF. The complex modification of cement paste by MWCNT and PCE increases the yield stress and plastic viscosity from the MWCNT dosage of 0.06% and 0.015% bwoc, respectively. The yield stress and plastic viscosity of cement paste with PCE enhanced by 265% and 107%, respectively, in a MWCNT dosage of 0.12% bwoc. MWCNT do not have a significant influence on the flow behaviour index of cement paste; however, in the case of usage of PCE, the shear thickening effect decreased from a MWCNT dosage of 0.03% bwoc. The significant reduction in the volume coefficient of water bleeding by 99, 100, and 83% was obtained with LS, NF, and PCE, respectively, with an increase in MWCNT dosage up to 0.24% bwoc.

scholarly journals The investigation of multi-walled carbon nanotubes dispersion and its influence on rheological properties of cement systems

2018 ◽  
Vol 251 ◽  
pp. 01030
Author(s):  
Gintautas Skripkiunas ◽  
Grigory Yakovlev ◽  
Ekaterina Karpova
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Particle Size ◽  
Rheological Properties ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Cement Pastes ◽  
Multi Walled Carbon Nanotubes ◽  
Ph Level ◽  
Walled Carbon Nanotubes

The current research is devoted to the studying of multi-walled carbon nanotubes (MWCNT) dispersion and its influence on the rheological properties of cement pastes. The pH and electrical conductivity test, zeta potential measurements, particle size analysis were performed for characterization of MWCNT dispersion. The MWCNT dispersion were tested during 1 month and presented the decrease of pH level from 8.89 to 8.02, increase of electrical conductivity from 2.00 to 2.75 mS/cm. The particle size analysis did not reveal the significant changes during 1 month of storage. The rheological test of nanomodified cement pastes were performed for concentration of MWCNT dispersion in the range from 0 to 0.5% by weight of cement. The decrease of yield stress by 30.7% and increase of plastic viscosity by 29.6% were obtained for cement paste modified by MWCNT dispersion in dosage of 0.25% by weight of cement. The changes in flow behaviour were established for cement pastes tested in 5 min after mixing and were not observed for cement pastes tested after 120 min of mixing.

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