Influence of MWCNT/surfactant dispersions on the mechanical properties of Portland cement pastes

This work studies the reinforcing effect of Multi Walled Carbon Nanotubes (MWCNT) on cement pastes. A 0.35% solid concentration of MWCNT in powder was dispersed in deionized water with sodium dodecyl sulfate (cationic surfactant), cetylpyridinium chloride (anionic surfactant) and triton X-100 (ampho...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2017-12, Vol.935 (1), p.12014
Main Authors: Rodríguez, B, Quintero, J H, Arias, Y P, Mendoza-Reales, O A, Ochoa-Botero, J C, Toledo-Filho, R D
Format: Article
Language:English
Subjects:
Bulk density
Cement
Cement paste
Deionization
Dispersions
Homogeneity
Mechanical properties
Microprocessors
Multi wall carbon nanotubes
Physics
Porosity
Portland cements
Sodium dodecyl sulfate
Surfactants
Tensile strength
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This work studies the reinforcing effect of Multi Walled Carbon Nanotubes (MWCNT) on cement pastes. A 0.35% solid concentration of MWCNT in powder was dispersed in deionized water with sodium dodecyl sulfate (cationic surfactant), cetylpyridinium chloride (anionic surfactant) and triton X-100 (amphoteric surfactant) using an ultrasonic tip processor. Three concentrations of each surfactant (1mM, 10mM and 100mM) were tested, and all samples were sonicated until an adequate dispersion degree was obtained. Cement pastes with additions of carbon nanotubes of 0.15% by mass of cement were produced in two steps; first the dispersions of MWCNT were combined with the mixing water using an ultrasonic tip processor to guarantee homogeneity, and then cement was added and mixed until a homogeneous paste was obtained. Direct tensile strength, apparent density and open porosity of the pastes were measured after 7 days of curing. It was found that the MWCNT/surfactants dispersions decrease the mechanical properties of the cement based matrix due to an increased porosity caused by the presence of surfactants.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/935/1/012014