Topic
Geopolymer
About: Geopolymer is a research topic. Over the lifetime, 6776 publications have been published within this topic receiving 157991 citations. The topic is also known as: geopolymers.
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TL;DR: In this paper, the effects of simulated fire exposure on solid and low density, cellular structured geopolymers in order to assess their suitability for high temperature applications such as thermal barriers and fire resistant panels were reported.
Abstract: This paper reports on the effects of simulated fire exposure on solid and low density, cellular structured geopolymers in order to assess their suitability for high temperature applications such as thermal barriers and fire resistant panels. Geopolymer mixes with designed Si:Al ratios of 2.5 were synthesised from three different class F fly ashes. Low density samples were produced by adding a small amount of metallic aluminium to the geopolymer slurry which reacted with the free NaOH to produce a cellular structure in the hardened material. Physical properties of the materials are presented as well as results from scale fire tests. An international standard fire curve (ISO 834) was used to simulate the heating conditions of a fire. Fire testing was conducted on 50 mm thick panels with an exposure region of 200 mm × 200 mm. Fire ratings of more than 90 min were achieved with water content and resistance to shrinkage cracking identified as important sample parameters.
95 citations
TL;DR: In this article, a binary geopolymer system composed of metakaolin (MK), waste red brick (WRB) powder and sodium silicate solution as an alkaline activator was investigated.
95 citations
TL;DR: In this article, the effect of adding various quality steel fibers, in the ratio of 1, 3, 5 w/w%, on the compressive and flexural strength as well as on the structure of geopolymer was investigated.
95 citations
TL;DR: In this article, the influence of recycled concrete aggregates derived from the demolished concrete waste on the mechanical properties of geopolymer concrete (GPC) has been investigated, and the results infer that the inclusion of recycled aggregate improves the strength characteristics of GPC.
95 citations
TL;DR: The preliminary results of the bending tests point out an excellent behavior of the geopolymeric mixture tested, with the failure load of the reinforced beams roughly twice that of the control beam.
Abstract: In this study the development of a metakaolin based geopolymeric mortar to be used as bonding matrix for external strengthening of reinforced concrete beams is reported. Four geopolymer formulations have been obtained by varying the composition of the activating solution in terms of SiO2/Na2O ratio. The obtained samples have been characterized from a structural, microstructural and mechanical point of view. The differences in structure and microstructure have been correlated to the mechanical properties. A major issue of drying shrinkage has been encountered in the high Si/Al ratio samples. In the light of the characterization results, the optimal geopolymer composition was then applied to fasten steel fibers to reinforced concrete beams. The mechanical behavior of the strengthened reinforced beams was evaluated by four-points bending tests, which were performed also on reinforced concrete beams as they are for comparison. The preliminary results of the bending tests point out an excellent behavior of the geopolymeric mixture tested, with the failure load of the reinforced beams roughly twice that of the control beam.
94 citations