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Item type:Publication, Optimization of a reinforced geopolymer composite using natural fibers and construction wastes(Elsevier, 2020-10-20)Geopolymer technology has allowed the development of eco-friendly construction materials with high mechanical properties using industrial wastes and residues. However, geopolymers show fragility and low ductility behavior similar to Portland cement-based materials. This article focuses on the evaluation of jute and sisal fibers as reinforcement of a geopolymer matrix produced from residues of Fired Clay Brick Powder (FCBP). Control samples with no fibers and reinforced matrices with different contents of jute (ranging from 0.5 to 2.0 wt%) and sisal fibers (ranging from 0.5 to 3.0 wt%) were produced to study the effect of the fiber type and content on the mechanical properties of the resulting geopolymer composites. Mechanical characterization consisted of compression, splitting tensile, and three-point bending tests. The results of compression and splitting tensile tests showed the existence of an optimum fiber content that depends on the fiber type for reaching the maximum strength while the three-point bending test results indicated a linear relationship between the flexural strength and the fiber content. The addition of 2.5% (wt%) of sisal fibers increased the compressive, splitting tensile and flexural strengths up to 76%, 112%, and 270%, respectively, in comparison to the control samples. On the other hand, FCBP-based geopolymers with 1.5% (wt%) jute fiber reinforcement showed an increase up to 64%, 45%, and 222% of the compressive, splitting tensile and flexural strengths, respectively. Both, jute and sisal fiber addition at the optimum content, lead to a change in the failure mode of the samples from a brittle to a more ductile failure in all mechanical tests. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of Peruvian sisal fiber on the mechanical and microstructural strength of concrete(Springer Science+Business Media, 2025-06-01)In response to environmental concerns, such as global warming, there has been growing interest in the development of sisal fiber (SF)-reinforced concrete due to its low environmental impact and reduced cost. This study evaluated the effect of SF on the mechanical and microstructural properties of concrete. Sisal fibers, with a length of 50 mm, were selected and added to concrete at 0.5, 1, 1.5, 1.5, and 2% by weight of cement, with a treatment using CaO for 7 days. A total of 80 specimens were prepared to analyze compressive strength, tensile strength, flexural strength, elastic modulus, and microstructural properties. The results showed that the optimum SF content was 1.5%, where parameters such as workability, unit weight, and air content decreased but remained within permissible ranges, while temperature remained constant. Significant improvements were observed in compressive, tensile, and flexural strengths, with increases of 17.80%, 52.30%, and 88.83%, respectively. However, a 5.56% reduction was observed in the elastic modulus compared to the reference concrete. X-ray diffraction analysis revealed changes in the concentrations of crystalline phases such as quartz and albite, while energy dispersive spectroscopy highlighted a higher oxygen content, indicating more efficient hydration of the cement. The 1.5% SF (T4) optimizes cost–benefit (+ 88.8%), but higher doses reduce efficiency. It is ideal for walls and sidewalks, prioritizing resistance to cracking and sustainability. SF is eco-efficient and economical compared to synthetic fibers. This demonstrates that the incorporation of SF into concrete represents a sustainable and efficient alternative that significantly improves its mechanical and microstructural properties.5