Extrudability of cement-based composites reinforced with curauá (Ananas erectifolius) or polypropylene fibers

[Display omitted] The aim of this research was to evaluate the influence of the curauá or polypropylene fibers on rheological properties of fresh cementitious paste. The variables were the percentage of fiber content 1 wt% or 2 wt% and the length of the curauá or polypropylene fibers: 6 or 10 mm, bu...

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Bibliographic Details
Published in:Construction & building materials 2019-04, Vol.205, p.97-110
Main Authors: Teixeira, R.S., Santos, S.F., Christoforo, A.L., Savastano, H., Lahr, F.A.R.
Format: Article
Language:English
Subjects:
Analysis
Mercury intrusion porosimetry
Polypropylene
Polypropylene fibers
Portland cement
Properties
Propylene
Ram extruder
Rheological additives
Rheology
Sheep
Squeeze flow
X-ray microtomography
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Summary:[Display omitted] The aim of this research was to evaluate the influence of the curauá or polypropylene fibers on rheological properties of fresh cementitious paste. The variables were the percentage of fiber content 1 wt% or 2 wt% and the length of the curauá or polypropylene fibers: 6 or 10 mm, but it was also prepared paste without fibers as reference. Squeeze flow and ram extrusion tests were carried out to analyze the flow of the pastes. The hardened paste was evaluated by X-ray microtomography to observe the orientation of the fibers inside the paste. Curauá fiber led to higher force of extrusion and lower displacement of the fresh cement paste at the squeeze flow test and increased the pressure at the ram extrusion test in relation to polypropylene fibers, independently of the content and length. However, length of the same fiber presented higher influence on mixture flow than fiber content.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2019.02.010