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RETRACTED: Effect of micro polypropylene fibres and nano TiO2 on the fresh- and hardened-state properties of geopolymer concrete

2021; Elsevier BV; Volume: 300; Linguagem: Inglês

10.1016/j.conbuildmat.2021.124239

1879-0526

Arash Karimipour, Mansour Ghalehnovi, Jorge de Brito,

Recycled Aggregate Concrete Performance

This study intends to assess the influence of micro polypropylene fibres (MPPF) and nano-TiO2 on the fresh- and hardened-state properties of fly ash (FA) based geopolymer concrete (GPC). 15 concrete mixes were produced and the slump, compressive, splitting tensile and flexural strengths, sorptivity, sulphate and chloride attack were measured. Five TiO2 incorporation ratios were used: 0%, 1%, 2%, 3%, 4% and 5% in terms of weight. Additionally, three MPPF contents were added in terms of volume: 0%, 1% and 2%. One sample was selected as a control specimen with no TiO2 and MPPF. Furthermore, new models were developed to predict the mechanical properties of GPC produced by different TiO2 and MPPF contents. The results showed that the mechanical properties and resistance of FA-based GPC against sulphate and chloride attacks were considerably improved with the use of nano-TiO2 and these properties were further enhanced when MPPF were also added. Therefore, using 5% nano-TiO2 with 2% MPPF improved the resistance of GPC against sulphate and chloride attacks respectively by 53% and 36%. In addition, the proposed models, with a high agreement with the experimental results, are useful tools to predict the mechanical properties of FA-based GPC produced with different nano-TiO2 and MPPF contents.