Influence of MWCNT/surfactant dispersions on the rheology of Portland cement pastes

Journal Article · Tue May 15 04:00:00 EDT 2018 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2018.02.020· OSTI ID:22806484

Arias Jaramillo, Yhan Paul; Ochoa Botero, Juan Carlos ^[1]; Delgado, Carmen Alicia; Quintero, Jorge Hernán ^[2]; Toledo Filho, Romildo Dias ^[3]

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1. Universidad Nacional de Colombia (Colombia)
2. Universidad de Medellín (Colombia)
3. Universidade Federal do Rio de Janeiro (Brazil)

This work studies the effect of MWCNT/surfactant aqueous dispersions on the rheology of cement paste. Three types of surfactants (sodium dodecyl sulfate, cetylpyridinium chloride and triton TX-100) were used to prepare cement pastes with and without MWCNT. Three rheological parameters were determined for each sample: static yield stress, yield stress, and viscosity. The first was measured directly, while the other two were obtained by fitting a Bingham model to the descending portion of a flow curve. Additionally, X-ray diffraction and isothermal calorimetry were used to follow the hydration reaction of cement during the first hour. It was found that the MWCNT/surfactant dispersions generate an overall shift to higher yield stress values while maintaining viscosity, suggesting a modification of the interparticle attraction. It was concluded that the triple interaction MWCNT-surfactant-cement governs the rheology of cement pastes.

• OSTI ID: 22806484
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 107; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CALORIMETRY
CARBON NANOTUBES
CHLORIDES
HYDRATION
MATHEMATICAL MODELS
PORTLAND CEMENT
SODIUM SULFATES
STRESSES
SURFACTANTS
VISCOSITY
X-RAY DIFFRACTION