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Ceramic materials, such as geopolymers, have been increasingly used in civil construction as a compatible, green-friendly, and even more efficient alternative. They are obtained through the mixture of an aluminosilicate source, with an alkali solution, and its mechanical properties may vary according to its molar ratios, curing regimes and processing conditions. Geopolymers present compatible mechanical and durable responses, despite their characteristic brittle behaviour. Fiber reinforcement appear as an interesting solution to overcome this vulnerability. Particulate, discrete and textile forms of distinct fibers can be used as reinforcements, resulting in sustainable solutions (natural fibers) and even ultraductility performance (synthetic fibers). This study presents an experimental evaluation of distinct geopolymer composites reinforced with natural (sisal, jute and curauá) and synthetic fibers (PVA). The geopolymer mixture was produced with metakaolin in a sodium based solution. Compression, tensile and pull-out tests were performed. Scanning electron microscopy (SEM) was used to investigate the hardened geopolymer microstructure. Despite presenting distinct quantitative responses, all composites exhibited strain-hardening behaviour with multiple cracking formation.

Mechanical response of geopolymer composites reinforced with distinct types of fibers