Geopolymers: Past, Present, and Future of Low Carbon Footprint Eco-Materials

Sotelo-Piña, Carlos; Aguilera-González, Elsa Nadia; Antònia, Maria

doi:10.1007/978-3-319-48281-1_54-1

Cited by 11 publications

(10 citation statements)

References 60 publications

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“…A limitation to the wide application of geopolymer materials is their relatively low brittle behavior (crack resistance) [ 22 , 23 ]. Currently, one of the most important research areas concerns the improvement of these mechanical properties [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

et al. 2021

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This paper presents the results of research on geopolymer composites based on fly ash with the addition of melamine fibers in amounts of 0.5%, 1% and 2% by weight and, for comparison, without the addition of fibers. The melamine fibers used in the tests retain their melamine resin properties by 100% and are characterized by excellent acoustic and thermal insulation as well as excellent filtration. In addition, these fibers are nonflammable, resistant to chemicals, resistant to UV radiation, characterized by high temperature resistance and, most importantly, do not show thermal-related shrinking, melting and dripping. This paper presents the results of density measurements, compressive and flexural strength as well as the results of the measurement of thermal radiation changes in samples subjected to a temperature of 600 °C. The results indicate that melamine fibers can be used as geopolymer reinforcement. The best result was achieved for 0.5% by weight amount of reinforcement, approximately 53 MPa, compared to 41 MPa for a pure matrix. In the case of flexural strength, the best results were obtained for the samples made of unreinforced geopolymer and samples with the addition of 0.5% by weight of melamine fibers, which were characterized by bending strength values above 9 MPa, amounting to 10.7 MPa and 9.3 MPa, respectively. The thermal radiation measurements and fire-jet test did not confirm the increasing thermal and fire resistance of the composites reinforced by melamine fiber.

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Section: Introductionmentioning

confidence: 99%

Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

et al. 2021

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“…Geopolymers are often used in a construction industry, but they also find important applications in the immobilization of toxic waste and heavy metals, and also for the refractory coatings in aviation equipment. Geopolymers are suitable for the production of geopolymer cements, mortars, and concrete with similar or even better properties than traditional materials used in construction [1,2].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Hybrid Melamine and Steel Fiber Reinforced Geopolymers Composites

et al. 2020

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This study investigated the influence of the steel and melamine fibers hybridization on the flexural and compressive strength of a fly ash-based geopolymer. The applied reinforcement reduced the geopolymer brittleness. Currently, there are several types of polymer fibers available on the market. However, the authors did not come across information on the use of melamine fibers in geopolymer composites. Two systems of reinforcement for the composites were investigated in this work. Reinforcement with a single type of fiber and a hybrid system, i.e., two types of fibers. Both systems strengthened the base material. The research results showed the addition of melamine fibers as well as steel fibers increased the compressive and flexural strength in comparison to the plain matrix. In the case of a hybrid system, the achieved results showed a synergistic effect of the introduced fibers, which provided better strength results in relation to composites reinforced with a single type of fiber in the same amount by weight.

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“…Extensive research on the geopolymer has been carried out worldwide, hoping to promote geopolymer composites as the ultimate sustainable building material in the future [ 8 , 9 ]. Although geopolymer has great development potential in the construction industry, its low brittle behavior is one of the limitations of its application [ 10 , 11 ]. Many researchers have carried out studies on how to improve the toughness of geopolymer.…”

Section: Introductionmentioning

confidence: 99%

Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

et al. 2022

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In this work, polyvinyl alcohol (PVA) fiber and powder were added to geopolymer composites to toughen fly ash-based geopolymer, and their different toughening mechanisms were revealed. Firstly, different contents of active granulated blast furnace slag (GBFS) were added to the geopolymer to improve the reactivity of the GBFS/fly ash-based geopolymer, and the best ratio of GBFS and fly ash was determined through experiments testing the mechanical properties. Different contents of PVA powders and fibers were utilized to toughen the geopolymer composites. The effect of the addition forms and contents of PVA on the mechanical properties, freeze–thaw cycle resistance, and thermal decomposition properties of geopolymer composites were systematically studied. The results showed that the toughening effect of PVA fiber was better than that of PVA powder. The best compressive strength and flexural strength of geopolymer composites toughened by PVA fiber were 41.11 MPa and 8.43 MPa, respectively. In addition, the composition of geopolymer composites was explored through microstructure analysis, and the toughening mechanisms of different forms of PVA were explained. This study provided a new strategy for the toughening of geopolymer composites, which can promote the low-cost and efficient application of geopolymer composites in the field of building materials.

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Geopolymers: Past, Present, and Future of Low Carbon Footprint Eco-Materials

Cited by 11 publications

References 60 publications

Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

Fly-Ash-Based Geopolymers Reinforced by Melamine Fibers

Evaluation of Hybrid Melamine and Steel Fiber Reinforced Geopolymers Composites

Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

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