Per: Leandro Barbosa de Oliveira (UENF ), Madeleing Taborda Barraza (UFSC), markssuel teixeira marvila (uenf), Luis Urbano Durlo Tambara Junior (UENF), Juliane Castro Carneiro (PORTO DO AÇU OPERAÇÕES S.A.), Luíz Gustavo Cruz Henriques da Silva (PORTO DO AÇU OPERAÇÕES S.A.), Sérgio Neves Monteiro (IME), Carlos Mauricio Fontes Vieira (uenf), Afonso Rangel Garcez de Azevedo (uenf)
Abstract:
The objective of this work was to create a geopolymeric paste of metakaolin and residue from Porto do Açu (RPA), from the dredging process, to achieve structural reinforcement values. X-ray diffraction (XRD) and laser granulometry were performed to investigate the precursors. Subsequently, metakaolin-based geopolymers were prepared with RPA replacements in 8 compositions, varying the thermal cure time in 1, 3 and 6 days at 65 ºC and compression rupture in 7 and 28 days. The XRD of RPA showed a high crystallinity and low potential to act as a precursor, due to its low reactivity, resulting in compressive strength values below 1.65 MPA for 100% replacement of RPA. The granulometry showed that RPA has finer particles than metakaolin, being a good filling material. Thus, the compressive strength results showed that the replacements at lower levels, up to 30% of RPA, cured at 65 ºC for up to 6 days were effective and achieved strengths greater than 22 MPa, a fact that may be linked to the filling of voids in the samples due to the greater fineness of RPA compared to metakaolin.