Mechanical performance of geopolymeric mortars based on tunisian calcined clay, fly ash and metakaolin

• Autor(a) principal: Tahri, W.
• Data de Publicação: 2016
• Outros Autores: Samet, B., Baklouti, S., Pacheco-Torgal, F., Aguiar, J. L. Barroso de, Jesus, Carlos Manuel Gonçalves
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/47624
• topic: Geopolymeric mortars; Infrastructure repair; Compressive strength; Shrinkage; Hydration products; Clay; геополимерные растворы; вос- становление инфраструктуры; прочность при сжа- тии; усадка; продукты гидратации; глина

Infrastructure rehabilitation represents a multitrillion dollar opportunity for the construction industry. Since the majority of the existent infrastructures are Portland cement concrete based this means that concrete infrastructure rehabilitation is a hot issue to be dealt with. Geopolymers are novel inorganic binders with high potential to replace Portland cement based ones. So far very few studies in the geopolymer field have addressed the rehabilitation of deteriorated concrete structures. This paper discloses results of an investigation concerning the development geopolymeric repair mortars. The mortars are based on Tunisian clay coming from Medenine region, plus calcium hydroxide, sodium silicate and sodium hydroxide. Results show that the geopolymeric mortar has a high compressive strength and a lower unrestrained shrinkage performance as long as partial replacement by metakaolin is carried out. The results also show that Tunisian calcined clay based mortars have hydration products with typical geopolymeric phases.s a high compressive strength and a lower unrestrained shrinkage performance as long as partial replacement by metakaolin is carried out. The results also show that Tunisian calcined clay based mortars have hydration products with typical geopolymeric phases.