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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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Journal ArticleDOI
TL;DR: In this paper, the authors deal with elevated temperature properties of basalt microfibril filled geo-polymer composites when exposed to 200, 400, and 800 degrees C.

64 citations

Journal ArticleDOI
TL;DR: In this article, a review of known factors that influence the setting time of fresh geopolymers and discusses the underlying chemical and physical-mechanisms of each parameter is discussed.
Abstract: In recent years, environmentally sustainable geopolymers have been widely investigated to obtain comparable mechanical properties with Portland cement, and they are now close to being in a position where they can substitute parts of the cement production utilized in construction. However, in order for geopolymers to reach their full potential, it is crucial to understand the influence of various parameters (e.g., particle size, treatment of precursor, chemical composition) on the hardening evolution at earlier ages of the pastes and the resulting final mechanical strength of the set system. Hence, this paper reviews known factors that influence the setting time of fresh geopolymers and discusses the underlying chemical- and physical-mechanisms of each parameter. Next to this, the interconnection between the setting time and mechanical strength is discussed. This will provide a platform for researchers and engineers to understand the hardening evolution of geopolymers in a broader range.

64 citations

Journal ArticleDOI
TL;DR: In this article, the effect of binder content, curing temperature and curing time on the compressive strength of light-weight geopolymer mortar (LWGM) was investigated.

64 citations

Journal ArticleDOI
TL;DR: In this paper, leucite ceramics with different shapes and fine integrity were directly developed from geopolymer precursors by the optimized heat treatment procedures, and the effect of heating rates on the integrity of leucites was also discussed.
Abstract: In this paper, leucite ceramics with different shapes and fine integrity were directly developed from geopolymer precursors by the optimized heat treatment procedures. Phase compositions and microstructure, coupled with the mechanical properties, were systematically investigated. The effect of heating rates on the integrity of ceramics was also discussed. After high-temperature treatment at 800 °C for 120 min, the geopolymer was converted into a leucite ceramic. The relative density of the sample treated at 1000 °C for 120 min was 93% and the size of leucite grain was approximately 1–4 μm. TEM results showed that the leucite grain was composed of lamellar and needle-shaped twins, which resulted from the displacive phase transformation as it went from cubic to tetragonal symmetry when it was cooled down. Samples with plate and bullet shapes maintained their fine integrity by the optimization of the heating procedures. Meanwhile, the flexural strength, Young's modulus, fracture toughness and Vickers hardness of the leucite ceramic that resulted was 70.0 MPa, 65.0 GPa, 1.3 MPa m 1/2 and 7.39 GPa, respectively.

64 citations

Journal ArticleDOI
TL;DR: In this article, the mechanical properties of four different types of geopolymers, but of the same composition, made using a combination of precursors, were determined, and the effect of adding sand (40 ¼wt%) on their mechanical properties was also determined.
Abstract: The mechanical properties of four different types of geopolymers, but of the same composition (Na/Al ≈ 1, Si/Al ≈ 2 molar ratio), made using a combination of precursors, were determined. The four types were: (i) sodium aluminate (NaAlO2/NaOH solution), Ludox (colloidal SiO2 solution) and metakaolin (MK), (SAGP), (ii) NaOH, fumed silica and MK (FSGP), (iii) Ludox, NaOH and MK (LGP) and (iv) commercial sodium silicate and MK (SGP). The highest crushing strength (CCS) value obtained was for SGP (70 MPa) and the lowest value was for SAGP (16 MPa). The highest modulus of rupture (MOR) value obtained was for LGP (9 MPa) and the lowest value was for SAGP (3 MPa). The fracture toughness (K1c) and Young’s modulus (E) showed the same trend. The effect of adding sand (40 wt%) on their mechanical properties was also determined. The K1c values increased up to 65% and E values increased up to 80% compared to samples free of sand. However, CCS and MOR values did not change much and gave mixed results. Overall, porosity is found to be the chief microstructural variable limiting the mechanical properties of the geopolymers. The properties of the geopolymers are compared with those of ordinary Portland cement.

64 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,059
20221,744
2021990
2020891
2019752
2018658