Flexural Behavior of Carbon Textile-Reinforced Geopolymer Composite Thin Plate
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Date
2019-11-08
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
Textile-reinforced Portland cement-based concrete has been researched and developed
over the last few decades. It was widely used in a different range of applications, such as repair
and/or strengthening of structural elements, thin walls, lightweight structures, façade elements,
and others. Due to its varied application, this study aims to develop the carbon textile-reinforced
geopolymer composite. Specimens of rectangular form with the dimensions of 400 × 100 × 15 mm3
,
reinforced with carbon textile, were produced. Four-point bending test was used to evaluate the
effect of carbon textile on the mechanical strength of reinforced geopolymer composite based on the
three factors: the different mortar compositions corresponding to the addition of the chopped basalt
fiber (BF), the number of carbon textile layers, and the different thicknesses of the mortar cover layer.
Besides that, a small part of the pull-out test was also considered to assess the adhesion strength
at the interface between carbon textile and geopolymer mortar. The experimental results from the
four-point bending test showed that the mechanical strength of composite specimens increased when
the content of the chopped basalt fiber increased. With the increasing number of the textile layers,
the specimens improved the flexural strength significantly. However, the flexural toughness of the
specimens reinforced with three textile layers did not improve, as compared to those reinforced
with two textile layers. The experimental results for the specimens related to the mortar cover
thicknesses indicated that specimens with the mortar cover thickness of 2 mm provide the best
strength. The experimental results from the pull-out tests showed that all the specimens have the
same failure mode by slipping of the fiber yarn from the matrix.
Description
Subject(s)
geopolymer, pull-out, compressive strength, flexural strength, carbon textile, chopped basalt fiber, textile-reinforced geopolymer matrix