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.
Highlights
The ordinary Portland cement-based concrete (PCC) has been most widely used as construction material, due to its outstanding properties, such as high durability, high compressiveness, desired mechanical strength with respect to economic efficiency, ability to be cast into any desired shape, and that its ingredients are available in the most places
Geopolymer materials are synthesized from a two-component blend, including an alkaline solution primarily based on potassium or sodium, and solid aluminosilicate materials based on metakaolin or fly ash at room, or slightly higher, temperature [5,6,7]
The flexural behavior of carbon textile-reinforced specimens is based on three different factors: (i) the different mortar compositions corresponding to basalt fiber (BF) addition; (ii) number of textile layers; and (i) the different mortar compositions corresponding to BF addition; (ii) number of textile layers; and (iii) thicknesses of the mortar cover layer, which were investigated and discussed
Summary
The ordinary Portland cement-based concrete (PCC) has been most widely used as construction material, due to its outstanding properties, such as high durability, high compressiveness, desired mechanical strength with respect to economic efficiency, ability to be cast into any desired shape, and that its ingredients are available in the most places. The geopolymerization process is the result of the three different stages, consisting of (i) the dissolution of the primary aluminosilicate materials in an alkaline environment with release of silicates and aluminates species, (ii) organization of these species into a growing gel phase, and (iii) condensation of the gel phase to shape a stable 3D structure [8,9]. The manufacturing of the raw materials for geopolymers produces only a fraction of the CO2 emissions compared to Portland cement. For the above such advantages, it can be stated that geopolymers have drawn more attention as a promising building material
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