Synthesis, Application and Effect of Hybrid Nanocomposites Based on Hydrogel and Nanoclay in Cement-Mortars

Autor(es)

Watanuki Filho, Adhemar ; Higuti, Ricardo Tokio ; de Moura, Marcia Regina ; Aouada, Fauze Ahmad

• Tipo de documento: Artigo Científico
• Fonte: POLYMERS; v. 14, n. 21, p. 23-pg., 2022-11-01.

Resumo

Hybrid nanocomposite hydrogels, as admixtures for internal curing of cementitious materials, have been widely studied. This study analyzes the effect of applying 0.5% (wt/wt cement) of pre-soaked hydrogels based on polyacrylamide, carboxymethylcellulose, and three different concentrations of Cloisite-Na+ (0, 10, and 20% wt/wt) on the fresh and hardened properties of cementitious mortars. In general, all mortars with hydrogel decreased the consistency index, mainly M20, due to the high concentration of Cloisite-Na+ that modifies the release kinect of the hydrogel. The results showed a slight variation, with an overall average value of 99% water retention in all mortars. This behavior is due to the portion of hydrogel-mortars dosage water retained to reduce the availability of free water in the mixture because this amount of water is stored, a priori, within the polymer particles. At 28 d, the mortars produced with hydrogels containing 20% of nanoclay (M20) exhibit mechanical behavior similar to the reference mortar (M), which corroborates the percentage of voids found. Scanning electron microscope images confirm that the M and M20 mortars are uniform and possess few pores or microcracks. Thus, these hybrid hydrogels have the potential to be innovative materials for water control improvements in cementitious materials technology. (AU)

• Processo FAPESP: 18/18697-1 - Desenvolvimento de novos nanocompósitos magnéticos baseados em hidrogéis para avaliação como veículos carreadores de fármacos e insumos agrícolas
• Beneficiário: Fauze Ahmad Aouada
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/13580-9 - Investigação do efeito de hidrogel polimérico sobre as propriedades no estado fresco e endurecido de pastas cimentícias
• Beneficiário: Sabrina Lourenço Cilli
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs