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. 2022 Dec 17;15(24):9035.
doi: 10.3390/ma15249035.

Effects of Molarity and Storage Time of MWCNTs on the Properties of Cement Paste

Echeverry-Cardona Laura  1 , Cabanzo Rafael  2 , Quintero-Orozco Jorge  3 , Castillo-Cuero Harvi Alirio  4 , Rodríguez-Restrepo Laura Victoria  1 , Restrepo-Parra Elisabeth  1
Affiliations

Effects of Molarity and Storage Time of MWCNTs on the Properties of Cement Paste

Echeverry-Cardona Laura et al. Materials (Basel). .

Abstract

Nowadays, nanomaterials in cement pastes are among the most important topics in the cement industry because they can be used for several applications. For this reason, this work presents a study about the influence of changing the molarity of dispersed multiple wall carbon nanotubes (MWCNTs) and varying the number of storage days on the mechanical properties of the cement paste. To achieve this objective, dispersions of 0.35% MWCNTs, varying the molarity of the surfactant as 10 mM, 20 mM, 40 mM, 60 mM, 80 mM, and 100 mM, were performed. The mixture of materials was developed using the sonication process; furthermore, materials were analyzed using UV-Vis, Z-potential, and Raman spectroscopy techniques. Materials with a molarity of 10 mM exhibited the best results, allowing them to also be stored for four weeks. Regarding the mechanical properties, an increase in the elastic modulus was observed when MWCNTs were included in the cement paste for all storage times. The elastic modulus and the maximum stress increased as the storage time increased.

Keywords: MWCNT; cement paste; dispersion; sonication energy; stability.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Scheme of the procedure to produce and analyze the dispersion of MWCNTs dissolved in type 1 water, varying the molarity of the surfactant between 10 mM and 100 mM.
Figure 2
Figure 2
Scheme of the procedure to produce and analyze cement specimens with MWCNT solution dispersed at 390 J/g and with a molarity of surfactant of 10 Mm.
Figure 3
Figure 3
Image of the test cylinder (a) during the drying process and (b) during the curing and storage process.
Figure 4
Figure 4
Evolution of the 300 nm absorbance peak depending on the number of weeks of MWCNT dispersion in water with different TX-100 molarities.
Figure 5
Figure 5
Schematic representation of the zeta potential for nanotubes. The plus and minus signs represent the positive and negative charges, respectively. Colors of charges represent the potentials (charges from surface potential are red; charges from stern potential are green and black; charges from Z-potential are yellow and purple).
Figure 6
Figure 6
Z-potential of MWCNT dispersions in water with different TX-100 molarities and weeks of storage.
Figure 7
Figure 7
Raman spectra of MWCNT dispersions in water with different TX-100 molarities.
Figure 8
Figure 8
ID/IG ratio of MWCNTs dispersed in water with different TX-100 molarities.
Figure 9
Figure 9
Compressive tests for cement cylinders with the dispersion for S2 and S3.
Figure 10
Figure 10
Scheme of the gradual exfoliation processes of the MWCNTs.
Figure 11
Figure 11
(a) Elastic modulus and (b) maximum stress to S1, S2, and S3 samples.
Figure 12
Figure 12
SEM image obtained for a cement paste after the compressive test. This image was taken of sample S3.
See this image and copyright information in PMC

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